With un unchanged rev limiter and stock cams/retainers/head/springs, is it possible to damage the engine by bumping the revlimiter?

Im sure Im not the only person who would like to know this.

 

Yes

 

Wow, I didnt think it hurt anything. People at the autox bounce the revlimiter 10-15 times before some turns.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by onyx00 &raquo;</TD></TR><TR><TD CLASS="quote">Yes</TD></TR></TABLE>

Are you sure?

 

rev limiter = fuel cuttom at high rpm
high rpm = need fuel to be there
low fuel high rpm = things heat up
on n/a motor = as long as you don't stick there for a while, should be fine..

 

I hit the rev limiter about once a day in my Probe for the past year or, no damage at all, and that's with like a 7200rpm fuel cut.

 

I would say it is possible, but not likely.

 

Why are people answering who don't know for sure???

Chris - who waits for someone who actually knows what they are talking about to come with objective information.

 

at the auto cross i would do it all the time. I never had compression problems.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris N &raquo;</TD></TR><TR><TD CLASS="quote">Why are people answering who don't know for sure???

Chris - who waits for someone who actually knows what they are talking about to come with objective information.</TD></TR></TABLE>


anything is possible with an engine.....

i have bounced my sohc engine off the rev limiter for 1 mile in 2nd gear before and did no damage....7200 rpms for one minute....

 

The Toda Spec C's we bought from Raceline Development came with an extra piece of paper that explicitly says not to hit the rev limiter with those cams.

Not something I want to directly test.

But, this is a discussion on stock cams. Oops

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TypeR 01 886 &raquo;</TD></TR><TR><TD CLASS="quote">With un unchanged rev limiter and stock cams/retainers/head/springs, is it possible to damage the engine by bumping the revlimiter?

Im sure Im not the only person who would like to know this. </TD></TR></TABLE>

I'm sure its possible, but I regularly hit the stock rev limiter while autoxing and have not had any damage. I previously ran a delSol for 2 years also whacking the rev limiter regularly - no damage.

there is no logical reason why hitting the rev limiter will cause valve problems. However, mis-shifting and exceeding the rev limit very likely might.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chad &raquo;</TD></TR><TR><TD CLASS="quote">


anything is possible with an engine.....

i have bounced my sohc engine off the rev limiter for 1 mile in 2nd gear before and did no damage....7200 rpms for one minute....

</TD></TR></TABLE>

I just don't see how the rev limiter could cause any problems with valves. It is there to PROTECT the engine, not hurt it.

What was said above by vtec.dc2 makes little/no sense to me. When you hit the limiter, the fuel cuts off, rpms fall, then everything goes back to normal after falling about 400 rpm.

Unless someone can actually spell out HOW the revlimiter could cause a problem...

Anyhoo, I have bounced the rev limiter countless times, mostly in 3rd at the track. I have no compression issues or any problems at all. Then again, canuckr bent some valves recently without overrevving/misshifting at all. So it is a mystery to me...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris N &raquo;</TD></TR><TR><TD CLASS="quote">

I just don't see how the rev limiter could cause any problems with valves. It is there to PROTECT the engine, not hurt it.

What was said above by vtec.dc2 makes little/no sense to me. When you hit the limiter, the fuel cuts off, rpms fall, then everything goes back to normal after falling about 400 rpm.

Unless someone can actually spell out HOW the revlimiter could cause a problem...

Anyhoo, I have bounced the rev limiter countless times, mostly in 3rd at the track. I have no compression issues or any problems at all. Then again, canuckr bent some valves recently without overrevving/misshifting at all. So it is a mystery to me...</TD></TR></TABLE>

again.. rev limiter on our cars is fuel cuttof - good enough reason for me not to bounce into one.. what happens when you run less fuel at high rpm? - higher temps..

higher temps = more heat.. now.. since its n/a car, it might not be as bad, especially on stock hp car, the more hp you push, the less you'd want to hit rev limiter because you'll have less room for error.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris N &raquo;</TD></TR><TR><TD CLASS="quote">

I just don't see how the rev limiter could cause any problems with valves. It is there to PROTECT the engine, not hurt it. </TD></TR></TABLE>

no.. its there to warn you.. it affects a/f ratio - might be very little damage, but certainly doens't do any good in long run i'd rather have ignition cuttof

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec.dc2 &raquo;</TD></TR><TR><TD CLASS="quote">

again.. rev limiter on our cars is fuel cuttof - good enough reason for me not to bounce into one.. what happens when you run less fuel at high rpm? - higher temps..

higher temps = more heat.. now.. since its n/a car, it might not be as bad, especially on stock hp car, the more hp you push, the less you'd want to hit rev limiter because you'll have less room for error.</TD></TR></TABLE>

That doesn't make sense to me. The fuel cutoff/rev limiter process would not be setup in a way that would damage the engine. It makes no sense to think that the precaution honda took to protect from high-rpm failure (bend valves, etc) would actually cause damage.

Maybe steve sakai or someone like him can comment on this, because as far as I can tell, the rev limiter is a good thing.

vtec.dc2 - i just read your last post. I'd agree that it is a warning, but repeatedly hitting the rev limiter is no different than hitting it once or twice, IMO.

Therefore, if that is true, you can't bend valves by hitting the rev limiter. You may have other problems at high rpms that are causing bent valves... but I can't see how the rev limiter/fuel cut can cause that.

 

no.. in no way i'd be thinking about bending valves first by hitting rev limiter.. my first thought is a/f ratio.. it can not be the same.. you're just getting less fuel.. if i had wideband.. i could verify exactly how it does.. now.. if your car relies on 12.1 a/f ratio and you dont get that because of fuel cuttof.. things will heat up.. but bend valves would have to be due to higher rpm not exactly fuel cuttof related..

thats why i keep my redline at 9100rpm... i still shift at ~ 8500, but don't run into fuel cuttof..

 

I'll test this out tonight in my rental car (for stolen R).

 

wouldnt it make sense that at fuel cutoff there is a change in SPARK so that you do NOT have super lean issues.....

 

what flywheel? and Im assuming you have stock cams and valvesprings?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by owen_the_soyboy &raquo;</TD></TR><TR><TD CLASS="quote">wouldnt it make sense that at fuel cutoff there is a change in SPARK so that you do NOT have super lean issues.....
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See, another good point.

I"m almost positive that when you bounce the following happens:
fuel cut
spark changes
accelerator/throttle position is ignored

 

what if my rev limiter never seems to kick in while I'm in gear... it stops on the dot wen in neutral but wen in gear I have yet to hit it even at almost 9000 rpm this is running on stock ECU. Can that be adjusted?

 

Yes everything is stock and thanks for all the information but it seams that this topic has not been looked into enough.

I am a freak about my car (as im sure a lot of you are) I dont get on it hard at all and last night I got on it a bit and just hit the Rev limiter one time in first gear.

I freaked out because I never hit the rev limiter and I was pist at my self and have been driving lie grandma sence. My car seems completely normal and if I did damage anything (WOULD I KNOW IF I DAMAGED SOMETHING BY NOW?!?). I have searched and read all the symptoms of bent valves and I dont think that I have any of them.

I idle fine and I dont seem like I have any power loss. I was listening to my engine and it sorta sounds like it has a "slight" tick, but that could all be in my mind. I dont hear it soundling anything like a diesel engine or anything. Thats for your support keep the info coming and hopefully this will be a highly searched topic because im sure all the **** R owners out there will like to know the true answer to this.
HT

 

Unless you had some freak occurance, I'm going to say that you can't hurt your valves hitting the rev limiter.

I hit the rev limiter regularly in 3rd gear at the track coming into several turns, since I don't feel ballsy enough to shoot into 4th for several hundred feet. I've also hit the rev limiter a bunch at autox and getting on the highway. My compression numbers are all 225+, my vavles are all in spec and have no problems whatsoever. I wouldn't worry.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris N &raquo;</TD></TR><TR><TD CLASS="quote">Unless you had some freak occurance, I'm going to say that you can't hurt your valves hitting the rev limiter.

I hit the rev limiter regularly in 3rd gear at the track coming into several turns, since I don't feel ballsy enough to shoot into 4th for several hundred feet. I've also hit the rev limiter a bunch at autox and getting on the highway. My compression numbers are all 225+, my vavles are all in spec and have no problems whatsoever. I wouldn't worry.</TD></TR></TABLE>

Thanks man, I just needed some reassurnace. Again do you know how long it would take for me to start noticing **** br0ken?