What is VTEC and how do I know if I have it?
Mike Villeneuve
This is probably a dumb question to you all guys, but I read all these
messages saying dohc or sohc vtec, but what just is vtec, and what would
i look for in my '88 crx to see if i have a vtec?
thanks
Grendel
VTEC = Variable valve Timing with Electronic lift Control
VTEC is a special type special cam that has to sets of lobes per valve:
A High profile, which allows the valves (both intake and exhaust on some
engines, intake only on some, and exhaust on others, depending on the
aplication) to lift higher, and remain open longer periods of time so that
the engine can breath better get more air quicker, and get rid of more
exhaust faster thus improving the performance of the engine.
A low profile, which allows the engine to get improved fuel economy with
acceptable levels of performance.
The amazing thing is that the engine will switch from low profile to the
higher profile at around 4 or 5K rpm, when the additional performance is
actually needed.
SOHC VTEC engines are found in
All EX Civic's (94 and up)
All EX Accord's (94 and up)
All del Sol Si's
The 94 and 95 Civic VX hatchback has a special application VTEC called the
VTEC-E
that is tuned for maximum fuel efficiency.
The 96 and 97 Civic HX has a similar version of the VTEC-E
DOHC VTEC engines are found in
All Prelude and del Sol VTEC's
Acura Integra VTEC
Acura Integra Type R
Acura NSX
I may have left out a few of the Acuras.
--
GRE...@Pernet.net
Mike Villeneuve <mi...@sympatico.ca> wrote in article
<335017...@sympatico.ca>...
Niraj Mehta
> SOHC VTEC engines are found in
> All EX Civic's (94 and up)
> All EX Accord's (94 and up)
> All del Sol Si's
> The 94 and 95 Civic VX hatchback has a special application VTEC
called
> I may have left out a few of the Acuras.
>
VTEC was first introduced, I believe on the Acura NSX when it was
introduced in 1991, so the 88' CRX shouldn't have it.
And yes, you did leave out the Acura 3.0CL, which has the new SOHC VTEC
V-6, which is also supposed to be in the upcoming 1998 Accord (as a higher
end option, ofcourse). In our CL, the VTEC feels like its kicking in
around 3700 or so RPM, at least thats when the exhaust note changes. You
can feel the pick up though, its quite nice!
Marc2365
>SOHC VTEC engines are found in
> All EX Civic's (94 and up)
> All EX Accord's (94 and up)
> All del Sol Si's
> The 94 and 95 Civic VX hatchback has a special application VTEC
> that is tuned for maximum fuel efficiency.
> The 96 and 97 Civic HX has a similar version of the VTEC-E
>
>DOHC VTEC engines are found in
> All Prelude and del Sol VTEC's
> Acura Integra VTEC
> Acura Integra Type R
> Acura NSX
Is this information true? Please e-mail me direct.
Marc
"I'm sorry, but I seem to have forgotten the rest of what I was going to say."
.oooO
( ) Oooo.
\ ( ( )
\__) ) /
(__/
Hank Fang
the info looks to be correct although the newer accord EX's also haver the
DOHC VTEC powerplant.
Regards,
Hank
No matter how fast your car runs. No matter how hard your system
booms. There are 2 billion people in China who don't give a damn.
Homepage: http://www.wam.umd.edu/~fangtl/carworld.htm
Isaac Wong
Marc2365 (marc...@aol.com) wrote:
> >SOHC VTEC engines are found in
> > All EX Civic's (94 and up)
> > All EX Accord's (94 and up)
> > All del Sol Si's
> > The 94 and 95 Civic VX hatchback has a special application VTEC
> >called the VTEC-E
> > that is tuned for maximum fuel efficiency.
> > The 96 and 97 Civic HX has a similar version of the VTEC-E
> >
> >DOHC VTEC engines are found in
> > All Prelude and del Sol VTEC's
> > Acura Integra VTEC
> > Acura Integra Type R
> > Acura NSX
> > I may have left out a few of the Acuras.
> Is this information true? Please e-mail me direct.
Plus the Acura 2.2CL and 3.0CL coupes.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Isaac Wong iw...@chat.carleton.ca
Systems and Computer Engineering, Carleton University
Personal homepage: http://chat.carleton.ca/~iwong
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Rajan R Rajbhandari
Hank Fang (fan...@wam.umd.edu) wrote:
: the info looks to be correct although the newer accord EX's also haver the
: DOHC VTEC powerplant.
: On 21 Apr 1997, Marc2365 wrote:
: > >SOHC VTEC engines are found in
: > > All EX Civic's (94 and up)
.....
Which year did they start adding DOHC VTEC on accord EXs?
'94? when the last generation started?
Then why is the hp so much less than the Prelude's?
-RRR
---
Rajan Rajbhandari va...@uiuc.edu http://www.eecs.uic.edu/~rrajbhan
Michael Winestock
The 3.0 CL has a V6 VTEC engine that is designed to run on 87 octane
gas.
JeffP100
US Accords are all single-cam...
Hank Fang
by "designed to run 87 octane" do you mean honda/acura recommend the use
of 87 octane gas in the CL? or do you mean it CAN run 87 octane? becaus
eif so, all the newer cars on the street now are able to run on the quick
burning 87
Niraj Mehta
In article <Pine.SOL.3.95.970422...@rac1.wam.umd.edu>,
Hank Fang <fan...@wam.umd.edu> wrote:
> by "designed to run 87 octane" do you mean honda/acura recommend the use
> of 87 octane gas in the CL? or do you mean it CAN run 87 octane? becaus
> eif so, all the newer cars on the street now are able to run on the quick
> burning 87
Acura recommends 87 octane, as in, the 91 octane is not specifically
recommended, unlike some other higher end models. BTW, its a SOHC engine,
as is the U.S. Accord EX. Is the Accord Si-R in Japan DOHC? What's the
hp rating on it?
John
The US market EX VTEC Accords are all SOHC engines, but the Japanese models
have DOHC.
Regards,
John
Ron_Steve
In article <Pine.SOL.3.95.970422...@rac1.wam.umd.edu> Hank Fang <fan...@wam.umd.edu> writes:
>by "designed to run 87 octane" do you mean honda/acura recommend the use
>of 87 octane gas in the CL? or do you mean it CAN run 87 octane? becaus
>eif so, all the newer cars on the street now are able to run on the quick
>burning 87
>
One type is that which is tuned to provide a certain level of performance
regardless of what grade of gasoline you run. These engines should run
on 87 octane, because premium gasoline provides no performance advantage
and is a waste of money.
The other (can someone tell me what the names for these are) adapts to
give you maximum performance from what you're running. It'll run fine
on 87 octane, but has to detune itself (slightly retarded spark timing
and the like) to do so without pinging. But if you run higher octane,
you'll get better performance.
Anyone know which type most VTEC engines are???
--Ron
Toby Weir-Jones
Harry Everhart wrote:
>
> VTEC - dohc vtec - 160 hp ( i would have gotten this but wife wanted
> automatic transmissions, not available with this engine) (same equipment
> at Si)
Not quite--the del Sol VTEC also includes ABS, which is unavailable on
the other models in the line. I believe its anti-roll bars are slightly
larger diameter too, though I'm not sure about that.
twj
Harry Everhart
del Sol offers 3 engines -
S - regular ohv engine - 107 hp (13 inch tires and no alloy wheels)
Si - sohc vtec - 127 hp (i just bought this one) (4 wheel disk brakes,
nice tires, 14 inch alloys wheels)
VTEC - dohc vtec - 160 hp ( i would have gotten this but wife wanted
automatic transmissions, not available with this engine) (same equipment
at Si)
vtec kicks in at about 5000 rpm and feels like and extra gear. it only
provides horsepower at high rpm.
Hope this helps,
Harry
John Alexiou
ever...@postoffice.ptd.net (Harry Everhart) writes:
>vtec kicks in at about 5000 rpm and feels like and extra gear. it only
>provides horsepower at high rpm.
I hate it when people say this. By definition power will be more at
higher RPM that at lower (up to the peak pwr point).
Probably what you are trying to say is that, it does NOT provide more
torque (and thus acceleration), it just keeps the same torque at higher
RPM resulting in more power output (can sustain acceleration longer
without gear change).
Also it does not feel like an extra gear. On the contrary, it allows you
to keep accelerating WiTHOUT upshifting (and thus achieving higher
average acceleration)
NOTE: On all FWD sporty cars peak acceleration is almost the same around
0.4-0.5g. The difference in power shows as the speed the car can achieve
in first gear. More speed, needs more power.
>Hope this helps,
>Harry
john
--
---------------------------------------
| John Alexiou. ja...@prism.gatech.edu. |
---------------------------------------
Andrew Aranda
Ron_Steve wrote:
>
> From what I've heard, there are two types of engine management systems.
> One type is that which is tuned to provide a certain level of performance
> regardless of what grade of gasoline you run. These engines should run
> on 87 octane, because premium gasoline provides no performance advantage
> and is a waste of money.
> The other (can someone tell me what the names for these are) adapts to
> give you maximum performance from what you're running. It'll run fine
> on 87 octane, but has to detune itself (slightly retarded spark timing
> and the like) to do so without pinging. But if you run higher octane,
> you'll get better performance.
>
> Anyone know which type most VTEC engines are???
>
> --Ron
--
The latter.
+---------------------------------------------------------+
| Andrew R. Aranda |
| a-ar...@ti.com |
| Texas Ex - 1992 |
| Texas Instruments Airborne Electro Optics |
+---------------------------------------------------------+
| http://www.smu.edu/~arandaa/ |
+---------------------------------------------------------+
banana...@gmail.com
> This is probably a dumb question to you all guys, but I read all these
> messages saying dohc or sohc vtec, but what just is vtec, and what would
> i look for in my '88 crx to see if i have a vtec?
>
> thanks
engine. How do I check if it has VTEC? the honda website states that the 1.6L Engine has an i-Vtec.
I tried to look for the VTEC solenoid but I'm kind of new to cars so I didn't know where to look.