13B in a boat...see a pic
BORDEN1000
I don't know if this is old news,but take a look at this boat w/ rotary power
http://www.outriderboats.com/news.html
bl
Amur_
"In addition to its great ride, OutRider 27 is an environmentally friendly
craft, Klem says. Its four-stroke engine enables the boat to meet all
emission standards, as well as contributes to its quiet performance. "
Do we need to give this man a slap for the 'four-stroke' comment? And
those bits about emissions and being quiet... If the boat has the Renesis
motor (or something very close) I can see the emissions comment, but quiet?
A rotary? I'm struggling with this. :)
ttyl,
Amur_
--
I kept racing down the stormy highway, searching
for the whereabouts of my interrupted dream,
letting all my lies and bitter illusions
blow off my back, with the wind.
"Konya Wa Hurricane"
(There's A Hurricane Tonight"
Lyrices by Aran Tomoko
The Raven
news:AuNd8.28105$I01.3...@news20.bellglobal.com...
> From the article:
> "In addition to its great ride, OutRider 27 is an environmentally friendly
> craft, Klem says. Its four-stroke engine enables the boat to meet all
> emission standards, as well as contributes to its quiet performance. "
>
> Do we need to give this man a slap for the 'four-stroke' comment?
No, praise him for being correct.
> And
> those bits about emissions and being quiet...
In comparison to the more common two stroke marine engines, which are having
problems meeting stricter emission requirements. As for noise, dumping the
exhaust below water level will help a lot.
> If the boat has the Renesis
> motor (or something very close) I can see the emissions comment, but
quiet?
> A rotary? I'm struggling with this. :)
Struggle, Curtiss Wright was one of the first rotary engine manufacturers in
the US. Guess where they sold a lot of their initial engines? Marine
applications.
--
The Raven
** Undisputed President of the ozemail.* NG's
** since August 15th 2000.
** Conqueror of the uunet.* NG's
Amur_
news:t91e8.636$936....@ozemail.com.au...
> "Amur_" <am...@sympatico.ca> wrote in message
> news:AuNd8.28105$I01.3...@news20.bellglobal.com...
> > From the article:
> > "In addition to its great ride, OutRider 27 is an environmentally
friendly
> > craft, Klem says. Its four-stroke engine enables the boat to meet all
> > emission standards, as well as contributes to its quiet performance. "
> >
> > Do we need to give this man a slap for the 'four-stroke' comment?
>
> No, praise him for being correct.
>
> > And
> > those bits about emissions and being quiet...
>
> In comparison to the more common two stroke marine engines, which are
having
> problems meeting stricter emission requirements. As for noise, dumping
the
> exhaust below water level will help a lot.
>
> > If the boat has the Renesis
> > motor (or something very close) I can see the emissions comment, but
> quiet?
> > A rotary? I'm struggling with this. :)
>
> Struggle, Curtiss Wright was one of the first rotary engine manufacturers
in
> the US. Guess where they sold a lot of their initial engines? Marine
> applications.
Okay, all (of my) glibness aside, what makes the 4-stroke description
accurate? After reading a few posted articles from various sites, I was
left with the impression that, at least in boinger terms, one could not
easily describe a rotary's cycle... I remember one site owner's write-up
saying, 'Is it a one stroke, a twelve stroke...?'
So they make their own rotaries and have been for a while (how long, btw?)
Cool. :) But, again, after reading on-line and listening to my own NA FC
(and from standing beside a mufflerless TII fully modded for racing - I
think that my ears are *still* ringing) the common thought seems to be that
rotaries are unusually loud and environmentally unfriendly. :(
ttyl,
Amur_, not a mechanic, not an engineer, just someone who wants to understand
his FC (and her cousins) a little better :)
Andy Oudyn
hence makes it a four stroke.. it just doesn't use four seperate piston
strokes to do this.. instead it uses the "corners" (made by the shape of the
Rotor and the semi cylindrical housing) to do the compressing and ignition,
exhaust and intake!.
There's heaps of little gif's on the web to help describe the process... If
you want on email me.. I got a few on my comp!
Hope this helps!
Andy
'79 RX7 13B NA
Amur_
news:a5asjh$ebq$1...@bunyip.cc.uq.edu.au...
>>There's heaps of little gif's on the web to help describe the process...
If you want on email me.. I got a few on my comp!
Thanks. I've got one or two sites bookmarked that explain how a rotary
works, but I've never done more than glance at them. Anyway, my thoughts
jumped back to that site with the, 'Is it a 2 stroke, a 12 stroke... ?'
line. So this would be classic RTFM, ne? Colour me embarassed. :)
Although I'm still curious about the 'emissions' part. :)
ttyl,
Amur_
The Raven
All four strokes occur in a rotary engine. Without digging out specific
references the 1968 SAE conference had a paper tabled where it was proven
beyond any argument that a rotary is a 4 stroke engine.
From a simplistic viewpoint, no air/fuel mixture passes through any
crankcase it's "inhaled" exactly like any 4 stroke.
> After reading a few posted articles from various sites, I was
> left with the impression that, at least in boinger terms, one could not
> easily describe a rotary's cycle... I remember one site owner's write-up
> saying, 'Is it a one stroke, a twelve stroke...?'
It really is a 4 stroke once you start ignoring the crank rotation.
> So they make their own rotaries and have been for a while (how long,
btw?)
> Cool. :)
Since the late 60's. I believe they were one of the few license holders in
the US to actually go into production. Don't know if they still make them.
> But, again, after reading on-line and listening to my own NA FC
> (and from standing beside a mufflerless TII fully modded for racing - I
> think that my ears are *still* ringing) the common thought seems to be
that
> rotaries are unusually loud and environmentally unfriendly. :(
The RX-4 was the first car sold in the US that met the, then new, emission
rules. The engine was fitted with the Rotary Engine Anti-Pollution System
(REAPS). Rotary engines have rather low emission levels (Nox) but are pretty
hopeless on the unburnt hydrocarbons (HC), all that being relative to the
similar vintage engines.
Visit www.monito.com and try to locate an old copy of the "The Wankel
Engine" by Jan P. Norbye. It will fill you in on all the history of rotarys
(at least until the late 70s).
David
no emmision gear, but they are easy to clean up (compared to a boinger).
The main exhaust pollutant in a rotary are carbon monoxide (partially
burnt) and unburnt hydrocarbons. This is a result of a "rich" mixture
and large port overlap. Injecting fresh air into the quite hot exhaust
manifold provides the extra oxygen neccessary to complete the combustion
process.
Oxides of nitrogen are caused by high combustion temperatures - the
higher the temp, the more NOx produced. The rotary has a relativley low
combustion temp when compared to a boinger, therefor producing less NOx.
And, of course, NOx is the real nasty in exhaust emmissions. NOx is
usually reduced by recirculating exhaust gasses, which limits the amount
of fresh charge into the engine, lowing combustion temps and therefor
limiting output.
--
Dave
****
"It's all just a load of Klatchian to me..."
Rincewind
****
Chas Hurst
The Raven <ws...@flashmail.com> wrote in message news:8ape8.1191$936....@ozemail.com.au...
Some small rotary engines do inhale thru the crank case for lubrication of the bearings. This is irrelevent to the fact that a
rotary is a 4 cycle ( the correct term) engine.
Chas Hurst
Felix Miata
> >>There's heaps of little gif's on the web to help describe the process...
> If you want on email me.. I got a few on my comp!
> Thanks. I've got one or two sites bookmarked that explain how a rotary
> works, but I've never done more than glance at them. Anyway, my thoughts
> jumped back to that site with the, 'Is it a 2 stroke, a 12 stroke... ?'
> line. So this would be classic RTFM, ne? Colour me embarassed. :)
Stop trying to think in terms of "stroke" and it becomes clear. A
boinger is an Otto Cycle engine. An Otto has four distinct power process
*cycles*, intake, compression, expansion, exhaust. On a boinger, these
just happen to coincide with crankshaft strokes, so the slang term
4-stroke developed. A rotary has no crankshaft and thus no strokes, but
it is no less an Otto Cycle engine than is a 4-"stroke" boinger.
--
"Blessed are all who fear the Lord, who walk in his ways."
Psalm 128:1 NIV
Team OS/2 ** Reg. Linux User #211409 ** Rotary ONLY since 1973
Felix Miata *** http://mrmazda.members.atlantic.net/ <- Not just a FAQ
The Raven
news:fMre8.15097$0C1.1...@newsread1.prod.itd.earthlink.net...
>
[snip]
> >
> > From a simplistic viewpoint, no air/fuel mixture passes through any
> > crankcase it's "inhaled" exactly like any 4 stroke.
>
> Some small rotary engines do inhale thru the crank case for lubrication of
the >bearings.
If you are referring to engines such as those used in the early Norton
Commando (rotary versions), you will find the air/fuel/oil mix was drawn
through the eccentric shaft and the gases never got anywhere near the
crankcase (because there was none).
>This is irrelevent to the fact that a
> rotary is a 4 cycle ( the correct term) engine.
Most correct
[snip]
Chas Hurst
The Raven <ws...@flashmail.com> wrote in message news:Q9of8.124$FH6....@ozemail.com.au...
> "Chas Hurst" <rose...@early.com> wrote in message
> news:fMre8.15097$0C1.1...@newsread1.prod.itd.earthlink.net...
> >
> [snip]
> > >
> > > From a simplistic viewpoint, no air/fuel mixture passes through any
> > > crankcase it's "inhaled" exactly like any 4 stroke.
> >
> > Some small rotary engines do inhale thru the crank case for lubrication of
> the >bearings.
>
> If you are referring to engines such as those used in the early Norton
> Commando (rotary versions), you will find the air/fuel/oil mix was drawn
> through the eccentric shaft and the gases never got anywhere near the
> crankcase (because there was none).
You are correct, there is no crank case. But one of the engines I was refering to is the Sachs engine, used in the first Malibu
Grad Prix cars and at least one motorcycle. The air/fuel/lubricant is drawn in thru the side of the rotor and lubricates the
engine bearings, just like a 2 cycle engine.