8 Spark plugs in a 4 cylinder.
Stephen Au
cyclinder?
Are all 8 in use all the time or only on fast acceleration?
Are there any other cars that have this?
Andrew Gerber
> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
>cyclinder?
for fuel efficiency, better emissions and combustion of gasoline
>
> Are all 8 in use all the time or only on fast acceleration?
>
All the time.
> Are there any other cars that have this?
My '83 Stanza has the same thing. Several Nissans of the early-mid
80's have 2 plugs/cylinder.
Usually no problem, unless you bring the car to a garage from hell and
they replace only 4 out of 8 plugs. Happned to me once.
--
/-----------------------------------------------------------------------/
/ Andy Gerber / ger...@solbourne.com /
/ Are your men on the right pills? - Flash Gordon /
/-----------------------------------------------------------------------/
Ethan A Bowerman
Yeah, well Mazda (I think it is Mazda anyway) is woking on a lean-burn
system to compete against Honda's that uses 4 spark plugs per cylinder-
on central and 3 perimeter on 120 degree increments. I forgot which ones, but
they don't all run at the same time. Some, maybe one, is only used on
acceleration- it has something to do with the flame front miving the unburned
fuel toward the other plugs for an optimum explosion.
Ethan Bowerman
V058L789@UBVMS
SCHRAM BRIAN K
> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
>cyclinder?
its because you get better combustion with 2 plugs. better (more
complete) combustions means: more power, less emissions, better
economy, etc. those split fire plugs (with a forked electrode) works
on this principal. course it also means more expensive tuneups :-)
> Are all 8 in use all the time or only on fast acceleration?
though i don't know specifics, i'd be real suprised if they both
weren't firing all the time. you'd get off centered firing
if just one was firing. the flame path would be "uneven" for lack of
better terminology. and they've taken the expense to design
a 2 plug combustion chamber - may as well use it all time.
> Are there any other cars that have this?
yes, i believe that Kenny Bernstein has been running a funny car
for a number of years with a V-8 that sports 16 spark plugs. and
i bet by now that most competition drag raceres use such a set up.
--
-brian
_______________________________________________________________________
| (this space for sale or rent) |
|_______________________________________________________________________|
Steve Pennypacker
Sure I know why... the car was built to fly, and all aircraft engines have
2 plugs per jug. ;-)
Jeffrey M. Mayzurk
>In article <1992Jan27....@solbourne.com>, ger...@solbourne.com (Andrew Gerber) writes...
>>In article <1992Jan27.1...@bmers95.bnr.ca> ste...@bnr.ca (Stephen Au) writes:
>>> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
>>>cyclinder?
> Yeah, well Mazda (I think it is Mazda anyway) is woking on a lean-burn
>system to compete against Honda's that uses 4 spark plugs per cylinder-
>on central and 3 perimeter on 120 degree increments. I forgot which ones, but
>they don't all run at the same time. Some, maybe one, is only used on
>acceleration- it has something to do with the flame front miving the unburned
>fuel toward the other plugs for an optimum explosion.
The Mazda RX-7 also uses a twin-plug system; it has four plugs, two for
each rotor. There are two coils; a primary and a secondary. The primary
fires first, and the secondary fires milliseconds afterwards to insure
complete combustion, thus improving power and efficiency, as well as emissions.
The new Porsche 3.6 carrera motor also utilizes a twin-plug system, and
twin-plug conversion heads are a popular (although expensive) conversion for
early 911's and 914's.
--
Jeffrey M. Mayzurk
J. R. Sims
-In article <1992Jan27.1...@bmers95.bnr.ca> ste...@bnr.ca (Stephen Au) writes:
-> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
->cyclinder?
-
-for fuel efficiency, better emissions and combustion of gasoline
-
->
-> Are all 8 in use all the time or only on fast acceleration?
->
-
-All the time.
-
On my 84 Stanza, all 8 are _not_ always used. Also note that they are
not the same on the intake and exhaust sides. I will post the exact
conditions upon which the second bank cuts out. I seem to remember
that it cuts out at low RPM, high throttle to reduce knocking.
rec.autos.tech brainteaser: 1970 Camaro had two problems: often when
restarting the engine 15-30 mins after running, the new starter turned
the engine right over, the engine would catch fine, but die as soon as
you release the key. Sometimes it would die on the road (but only
after a second start...) and quickly come back (but only after a
second start...) Around the same time, the air vent controls (vacuum
operated) stopped working. What was the component that caused both to
fail? One more hint: A timing light seemed to indicate that the spark
died just before the engine quit.
Answer posted with the 4/8 plug info tomorrow... Enjoy!
Rob
David Masters
Alfa Romeo 75 twin spark, 2 litre, 4 cylinder.
Also features variable intake timing, but for some reason is
rarely mentioned in reviews. If the Japs had it, it would be
written all over the side of the car :-)
david.
Alfa Romeo 75 twin spark.
--
David Masters, BHP Information Technology, Newcastle, AUSTRALIA.
Internet: da...@bhpese.oz.au Phone: +61 49 402132
Christer Palm
Alfa Romeo 75 Twin Spark
Alfa Romeo 164 Twin Spark
/Christer
--
"Destiny makes relatives, selection makes friends."
wel...@woods.ulowell.edu
>>cyclinder?
My '88 Stanza has 3 plugs per cylinder; apparently 1 near the intake
and 2 near the exhaust valve.
Jeffrey M. Mayzurk
Are you sure your car has three spark plugs per cylinder? I thought the
Stanza was a 12-valve, but I have never heard of a car with three spark plugs
per cylinder.
Andrew Gerber
Now let me get this right - when it comes time to change your plugs,
you have to replace 12 on a 4 cylinder engine?
Are you sure you don't mean valves? My '89 240SX has 3 valves per
cylinder, 2 intake, 1 exhaust.
[Yes, to those have noticed, I have both a '89 240SX and an '83
Stanza. I guess the most convenient thing about this setup is that I
only have to buy one kind of oil filter.]
Andy "Nissan" Gerber
Wayne Geiser
>> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
>>cyclinder?
>Usually no problem, unless you bring the car to a garage from hell and
>they replace only 4 out of 8 plugs. Happned to me once.
We used to own a 1980 200SX. Evidently, in that year, they had 8
plugs in the California version only. My wife took it in for a tuneup
and the service manager quoted her an extraordinary price for the
tuneup. When questioned, he explained that some of it was due to the
8 plugs that her car had. She said "it's only a 4 cylinder!" He
insisted that it had 8. She took him over, raised the hood, and said
"Show me 8!" There, of course, were only 4.
I just love telling this story.
>--
>/-----------------------------------------------------------------------/
>/ Andy Gerber / ger...@solbourne.com /
>/ Are your men on the right pills? - Flash Gordon /
>/-----------------------------------------------------------------------/
**********************************************************************
* Wayne Geiser ("Drivel King") Voice: (508) 977-8253 *
* PictureTel Corporation FAX: (508) 532-6893 *
* One Corporation Way Internet: gei...@pictel.com *
* Peabody, MA 01960 CIS: 70313,3615 *
**********************************************************************
"Lookit, I've done it their way this far and now it's my turn. I'm my
own handler. Any questions? Ask me ... There's not going to be any
more handler stories because I'm the handler ... I'm Doctor Spin."
- Dan Quayle responding to press reports of his aides having to,
in effect, "potty train" him.
Michiel van Meeteren
From the conditions he describes, it sounds like the resistor on the coil is
cracked. This would explain why the spark would all of a sudden drop away.
The engine would die, and thus vaccuum would disappear. Just as an
interesting sidenote.
On all the early GM motors that I have worked on that have an external
resistor to the coil, there is a green bypass wire to the solinoid, that
bypasses the resistor when starting. This wire runs close to all sorts of
hot exhaust and block parts. Look for this wire if you do a starter or a
solinoid, and make sure that it will not melt to the block. Mine did, and it
took me forever to figure out what it was. The resistor fried (because of
the direct current from 12v to ground through this resistor, and the ignition
stopped dead. The ignition system had all the signs of a fried coil. I got
sick of replacing the points, so I finally went to the junkyard and got an
electronic ignition. End of my points headaches. (BTW, most junkyards only
want about 25 bucks for a distributor, cap, rotor, coil, module, etc. The
trick is finding a decent cap with all the corroded ones out there.)
Later
--
(~)/~)/~) o / __ | I cant figure it out, when it said <HIT ANY KEY>,
/ / / / /_/ /__) | and I hit <SHIFT>, nothing happened. Then I hit
/ / (__/__/ \_/\__/ | <CAPS LOCK>, and still nothing happened!!
Frank Mallory
EA> >they replace only 4 out of 8 plugs. Happned to me once.
Some (perhaps most?) cars with 2 plugs per cylinder use the 10mm size plugs;
this should be a tipoff to any knowledgable mechanic that there would be 8
plugs in a 4-cyl engine.
* Origin: Silver Bullet - Silver Spring, Md. - 301-622-2247 (1:109/417)
akmo...@ccwf.cc.utexas.edu
*>>In article <1992Jan27.1...@bmers95.bnr.ca> ste...@bnr.ca (Stephen Au) writes:
*>>> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
*>>>cyclinder?
*>>
*>>for fuel efficiency, better emissions and combustion of gasoline
*>>
*>>>
*>>> Are all 8 in use all the time or only on fast acceleration?
*>>>
*>>
*>>All the time.
In my Nissan Hardbody factory service manual it states that it uses
only 4 of the eight during high rpms and eight during other times. (I
think it's a misprint, but I'm just repeating what the manual says.)
Also, this might only apply to the NAP-Z series motors.
*>>
*>>> Are there any other cars that have this?
*>>
*>>My '83 Stanza has the same thing. Several Nissans of the early-mid
*>>80's have 2 plugs/cylinder.
*>>
*>>Usually no problem, unless you bring the car to a garage from hell and
*>>they replace only 4 out of 8 plugs. Happned to me once.
*>>
Also Ford Ranger 4 cyl.
This is really an attempt by Nissan(Datsun) in the late seventies and
early eighties to meet the emission standard. I ran my truck on only
4 spark plugs once (one of the coil wire came loose) and the truck
still did 80 mph, only when I noticed that the acceleration is slow
and the gas consumption is higher did I found out about the problem.
I don't know if this is a curse of blessing.
*>>
*>>
*>>--
*>>/-----------------------------------------------------------------------/
*>>/ Andy Gerber / ger...@solbourne.com /
*>>/ Are your men on the right pills? - Flash Gordon /
*>>/-----------------------------------------------------------------------/
J. R. Sims
-*>In article <1992Jan27....@solbourne.com>, ger...@solbourne.com (Andrew Gerber) writes...
-*>>In article <1992Jan27.1...@bmers95.bnr.ca> ste...@bnr.ca (Stephen Au) writes:
-*>>> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
-*>>>cyclinder?
-*>>
-*>>for fuel efficiency, better emissions and combustion of gasoline
-*>>
-*>>>
-*>>> Are all 8 in use all the time or only on fast acceleration?
-*>>>
-*>>
-*>>All the time.
-
-In my Nissan Hardbody factory service manual it states that it uses
-only 4 of the eight during high rpms and eight during other times. (I
-think it's a misprint, but I'm just repeating what the manual says.)
-Also, this might only apply to the NAP-Z series motors.
-
-*>>
-*>>> Are there any other cars that have this?
-*>>
-*>>My '83 Stanza has the same thing. Several Nissans of the early-mid
-*>>80's have 2 plugs/cylinder.
-*>>
-*>>Usually no problem, unless you bring the car to a garage from hell and
-*>>they replace only 4 out of 8 plugs. Happned to me once.
-*>>
As a followup to my earlier post, here's the data straight from the 84
Stanza service manual:
Water temp > 15C Load Spark Spark timing
Cranking 2 Normal
Light idle 2 Normal
Light drive 2 Normal
Heavy drive 1 Advanced
Water temp < 15C - 2 Normal
The manual did not indicate which bank was active under heavy drive.
The exhaust side uses a hotter plug than the intake side (standard).
If you want, the intake side can take the same plug as the exhaust.
From personal experience, the plugs cross-referenced from the original
yielded Champion plugs way too large to fit on the intake side; there
wasn't enough clearance on the side.
On the brainteaser: The coil was normally supplied by a resistor wire.
It had a boost that was switched by the starter solonoid. This solonoid,
if it was moved while hot, would short the boost wire to ground when
you released the key, killing the power to the coil. The resistor wire
would then heat up, and it fused a vacuum hose in that same bundle closed,
preventing the vent doors from getting a vacuum source for movement.
Looks like only mvan...@ub.d.umn.edu (Michiel van Meeteren) came close.
I thought it was quite funny that a defective starter solonoid could
cause the vacuum operated vents to stop working...
Rob
Dana Dickson
'exhaust' plugs. They are evidently responsible for burning the post-
combustion gases somehow. If you notice, the plugs are located by
the exhaust manifold. To see how/when they are fired, take a look at
the inside of the distributor cap next time you have one around. To
ease the pain and expense of changing them every tuneup, go to some
Platinum plugs with a 50,000+ mile change interval. That seems to
work well.
Codesmiths
> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
> cylinder?
The mixture ignites faster & more evenly if you light it from more
than one place. With a lean mixture, even before you get to the
realms of "lean burn" engines, this becomes more important, sufficent
to warrant twin plugs.
Aircraft engines OTOH, are a different situation. Efficiency has
never been a major design constraint on piston aero engines (Did it
just get warm in here ?), but reliability certainly is. Twin spark
ignitions for aircraft have 2 completely separate ignition systems,
right back to the magnetos & ignition switches. If one fails, no big
problem.
> Are there any other cars that have this?
Alfa Romeo 75 Twin Spark. An incredibly complex engine for a 4 pot
production car. I test drove one when it first came out - 8-( 8-(
Most disappointing, never has so much engineering achieved so little.
Andy Dingley din...@cix.compulink.co.uk +44 91 230 1695
Alan Peterman
>In article <65...@ut-emx.uucp> akmo...@ccwf.cc.utexas.edu writes:
>-*>In article <1992Jan27....@solbourne.com>, ger...@solbourne.com (Andrew Gerber) writes...
>-*>>In article <1992Jan27.1...@bmers95.bnr.ca> ste...@bnr.ca (Stephen Au) writes:
>-*>>> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
>-*>>>cyclinder?
>-*>>
>-*>>for fuel efficiency, better emissions and combustion of gasoline
>-*>>
>-*>>>
>-*>>> Are all 8 in use all the time or only on fast acceleration?
>-*>>>
>-*>>
>-*>>All the time.
>-
>-In my Nissan Hardbody factory service manual it states that it uses
>-only 4 of the eight during high rpms and eight during other times. (I
>-think it's a misprint, but I'm just repeating what the manual says.)
>-Also, this might only apply to the NAP-Z series motors.
The dual plug engine was used by Nissan starting in 1980 on the 510 and
200SX. This was soon expanded to the pickups and the Stanza. The
earlier engine did NOT use the load cutout (based on manifold vacuum)
and suffered from some pinging. The 200SX and 510 use standard size
plugs, but on later models it was recommended to go one step hotter
on the exhaust side, again to reduce pinging. Finally the system with
the exhaust plug cutout was adopted.
It's a pretty good idea - although it's easy to abuse since the cars
run decently even if there are a few weak plugs, as long as the
other one in the same cylinder is firing well.
--
Alan L. Peterman (503)-684-1984 hm
a...@qiclab.scn.rain.com
It's odd how as I get older, the days are longer, but the years are shorter!
B.I.D.
>> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
>>cyclinder?
several of their sedans(I'm not sure which ones)
Evan
Dion Johnson
two plugs per cylinder has been around for many years in racing cars
and aircraft engines. The idea is that once in a while, the turbulence,
uneven fuel mixing, and generally chaotic nature of the universe
conspire to cause a plug to foul momentarily, or to fail to ignite
the mixture for some reason. Given two plugs, both sparking (possibly
even from separate ignition systems!), you have a little bit better
reliability, and perhaps a tad more power.
I suppose you might find a combustion chamber geometry where starting
the flame front propogation from two sources could somehow produce
better thermal efficiency than from just one, but that's just
a guess.
--
Dion L. Johnson -- di...@netcom.com
The material above is my personal opinion, and has no official sanction
and little relevance to any corporate position or policies of
The Santa Cruz Operation, Inc.
akmo...@ccwf.cc.utexas.edu
*>In article <1992Jan28...@woods.ulowell.edu>, wel...@woods.ulowell.edu writes...
*>>>> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
*>>>>cyclinder?
*>>
*>>My '88 Stanza has 3 plugs per cylinder; apparently 1 near the intake
*>>and 2 near the exhaust valve.
*>
*>Are you sure your car has three spark plugs per cylinder? I thought the
*>Stanza was a 12-valve, but I have never heard of a car with three spark plugs
*>per cylinder.
*>
*>--
*>Jeffrey M. Mayzurk
*>
*>jmm...@zeus.tamu.edu
Stanza in the past two years had the 12 valve motor that was used on
the first year 240SX. 240SX currently has the 16 valve version of the
motor. Early Stanzas has the NAP-_ motor, 8 valve, 8 spark plugs.
akm
Mark Wayne Blunier
>From article <25...@ub.d.umn.edu>, by ema...@ub.d.umn.edu (B.I.D.):
>> In article <1992Jan27....@solbourne.com> ger...@solbourne.com (Andrew Gerber) writes:
>>>In article <1992Jan27.1...@bmers95.bnr.ca> ste...@bnr.ca (Stephen Au) writes:
>>>> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
>>>>cyclinder?
>> To answer your question about who else does it, Alfa Romeo did/does it on
>> several of their sedans(I'm not sure which ones)
>> Evan
>I dont know about the Nissan specifically, but the practice of putting
>two plugs per cylinder has been around for many years in racing cars
>and aircraft engines. The idea is that once in a while, the turbulence,
>uneven fuel mixing, and generally chaotic nature of the universe
>conspire to cause a plug to foul momentarily, or to fail to ignite
>the mixture for some reason. Given two plugs, both sparking (possibly
>even from separate ignition systems!), you have a little bit better
>reliability, and perhaps a tad more power.
>
>I suppose you might find a combustion chamber geometry where starting
>the flame front propogation from two sources could somehow produce
>better thermal efficiency than from just one, but that's just
>a guess.
When a spark plug fires, igniting the fuel, a flame spreads from the
spark plug out over the piston. As the fuel burns, it builds up
pressure. If the pressure builds up too quickly, it will cause the
fuel to detonate due to pressure, instead of due to the flame. This
form of combustion is extremely stressful on an engine. By having
two spark plugs, with two difference sources for a flame front, the
fuel is much more likely to be burned by flame ignition.
Mark W. Blunier ** The sooner you get behind, the more time you
will have to catch up
richard welty
Alfa introduced the twin-spark cylinder head on the GTA and GTA Jr.
models back in the mid-60s; the GTA was a 1600cc 2+2 coupe which was
campaigned extensively in sedan classes both in europe and in the US
(Alfa GTAs won the championship in the under 2 liter class in the first
year of the SCCA Trans Am competition, a fact which is often forgotten
since we mostly remember the big detroit V-8s from that era.) the
GTA Jr. got a destroked version of the 1600, and could, in factory
trim, rev up in the 9000 rpm range quite readily. the twin spark
head subsequently appeared on the 1750 and 2000 motors in the GTAm,
a very trick limited production racer that Alfa developed after
changes in homogulation rules eliminated the GTA from touring sedan
competition (not enough GTAs being made to qualify, or some such.)
note that the 2000 cc GTAm motor was not the same as the normal
production 2liter motor; in addition to the radical cylinder head, it
had a different bore and stroke from the production motor, and thus
few common parts.
a twin spark head has since been developed for the standard 2 liter
alfa motor; this head has never been qualified for US emissions, as
the only 2 liter car currently imported is the Spider, and apparently
the motor, when fitted with this head, would be too large to just
drop in. the twin spark is sold in the Alfa 75 sedan in europe,
but when imported into the US as the Milano, it only received the
V-6 motor, probably for marketing reasons; there is less incentive
to keep motors below 2 liters in the US than there is in europe.
what are the reasons for Twin spark heads? i can't speak for Nissan,
but in aeronautical usage, twin plug motors are used for reliability
reasons. Alfa's logic is somewhat different; in a single plug hemi
head, the spark plug at the top of the combustion chamber limits the
angles that are possible for the valves, and limits the maximum size
of the valves. the only way to change this is to move the plug location,
but that gives up the ideal location. Alfa concluded that by putting
in two slightly offset plugs, they could get spark characteristics that
were nearly identical to a centered single plug, with much better
flow.
some of the modern lean burn motors are looking at multiple plug designs,
but the motivations vary.
cheers,
richard
--
richard welty 518-393-7228
we...@cabot.balltown.cma.com
Codesmiths
> Some (perhaps most?) cars with 2 plugs per cylinder use the 10mm size plugs;
> this should be a tipoff to any knowledgable mechanic that there would be 8
> plugs in a 4-cyl engine.
Why ? 10mm plugs are becoming very common now, on narrow TOHC
engines.
Mike Hughes
>di...@netcom.COM (Dion Johnson) writes:
>
>>From article <25...@ub.d.umn.edu>, by ema...@ub.d.umn.edu (B.I.D.):
>>I dont know about the Nissan specifically, but the practice of putting
>>two plugs per cylinder has been around for many years in racing cars
>>and aircraft engines. The idea is that once in a while, the turbulence,
>>uneven fuel mixing, and generally chaotic nature of the universe
>>conspire to cause a plug to foul momentarily, or to fail to ignite
>>the mixture for some reason. Given two plugs, both sparking (possibly
>>even from separate ignition systems!), you have a little bit better
>>reliability, and perhaps a tad more power.
>>
>>I suppose you might find a combustion chamber geometry where starting
>>the flame front propogation from two sources could somehow produce
>>better thermal efficiency than from just one, but that's just
>>a guess.
>
> When a spark plug fires, igniting the fuel, a flame spreads from the
> spark plug out over the piston. As the fuel burns, it builds up
> pressure. If the pressure builds up too quickly, it will cause the
> fuel to detonate due to pressure, instead of due to the flame. This
> form of combustion is extremely stressful on an engine. By having
> two spark plugs, with two difference sources for a flame front, the
> fuel is much more likely to be burned by flame ignition.
>
> Mark W. Blunier ** The sooner you get behind, the more time you
> will have to catch up
>
I agree with you on the detonation point, but doesn't firing two plugs
at once sound a lot like PREIGNITION? Colliding flame fronts are also kinda
forceful, from what I've read. I do question this, however, because it seams
like the force from two seperate fronts wouldn't be anywhere near as bad as
a detonating mixture. Any combustion-chamber-physics majors out there have
a comment?
Mike(the sig.less one)
Walter A. Koziarz
[ some one else wrote: ]
you both realize, don't you, that *real* engines have *NO* sparkplugs....
real engines operate at 80:1 air:fuel at idle
real engines operate at 20:1 air:fuel at full load
real engines have compression ratios of 17.5:1 or more
real engines are turbocharged
real engines spew forth only negligable unburned hydrocarbons and CO
and lastly --
real engines BURN DIESEL FUEL
Walt K.
Tom Leone
road with two spark plugs per cylinder: the Ford 2.3L OHC (in
the Mustang and Ranger since 1989). Note that this is not the
same engine as the 2.3L HSC in the Tempo/Topaz.
The advantage to twin spark plugs is not really (as someone
suggested) more complete combustion. It is faster combustion.
Faster combustion leads directly to better fuel economy and
power. It also leads indirectly to even more power, since you
can get rid of those nasty restrictive shrouded intake valves
(which induce swirl for faster combustion, but also restrict
your airflow). Plus, it leads indirectly to even more fuel
economy, since you can run more EGR without hurting
driveability.
Another great advantage of twin spark plugs (or any other
fast-burn system) is more stable, repeatable combustion. This
allows engine calibrators to set spark, air/fuel ratio, etc.,
closer to the values for best performance, with less compromise
for the occaisional bad cycle.
-Tom Leone <t...@slee01.srl.ford.com>
Brett Whinnen
|> > Are there any other cars that have this?
|>
|> Alfa Romeo 75 Twin Spark. An incredibly complex engine for a 4 pot
|> production car. I test drove one when it first came out - 8-( 8-(
|> Most disappointing, never has so much engineering achieved so little.
|>
Yes the Rotary engine has two seperate ignition systems.
Usually it has the two separate systems on the same distributer but at one stage
Mazda's designers had two separate dizzies as well.
|>
|> Andy Dingley din...@cix.compulink.co.uk +44 91 230 1695
--
+----------------------------------+------------------------------------------+
| Brett Whinnen. | e-mail b...@pandanus.cs.ntu.edu.au |
| | |
| Department of Computer Science | snail-mail PO box 39664 |
| Northern Territory University. | Winnellie NT |
| | 0821 Australia |
+----------------------------------+------------------------------------------+
Eric Youngblood
sch...@ucsu.Colorado.EDU (SCHRAM BRIAN K) writes:
|>ste...@bnr.ca (Stephen Au) writes:
|>
|>> Does anyone know why the Nissan 200SX Turbo has 2 plugs per
|>>cyclinder?
|>complete) combustions means: more power, less emissions, better
|>economy, etc. those split fire plugs (with a forked electrode) works
|>on this principal. course it also means more expensive tuneups :-)
|>> Are all 8 in use all the time or only on fast acceleration?
[stuff deleted]
I recently read an article in Car and Driver (Feb 92 issue) that explained
the concepts of "lean-burn" engines and in it they had some discussion
about multiple spark plugs and how they benefit the combustion process.
Ericy.
wel...@woods.ulowell.edu
cylinder. I got that info from a manual borrowed from a library,
but I only now got around to checking under the hood in the daylight.
It has 2 plugs, 1 on intake side, 1 on exhaust side. Those plugs on
the rear-facing side of the engine are hard to get at. I could see only 4
wires from the distributor going along the back side, but kept trying to find
out if somewhere they split to become 8.
I will have to go back to the library to reconcile what I read with
reality. Perhaps it said
1 <plug model number> intake port
2 <plug model number> exhaust port
and I mistook the "1" and "2" for the quantity of plugs rather than an
index to list. Note that different types of plugs are used, depending
on which side of the cylinder the ignition is taking place.
Lon Stowell
>
>I recently read an article in Car and Driver (Feb 92 issue) that explained
>the concepts of "lean-burn" engines and in it they had some discussion
>about multiple spark plugs and how they benefit the combustion process.
>
plugs per cylinder.
Of course my father's old 1936 Nash straight 8 Ambassador had
them, but what the hey....
For those of you who equate Nash with the Metropolitan, the
Ramblers, etc. Nash USED to be a hot-rod car back in the
mid-30's. Kinda like the Buick, Chrysler, etc.
ivangon...@gmail.com
pedr...@lycos.com
>
> for fuel efficiency, better emissions and combustion of gasoline
>
regulations. GM didn't for their pushrod V8. I would guess if there is a
"Euro 7" in future, they wouldn't pass.
