kelvinchau25

I've heard from some people that they've flashed their H22 ECU and raced at 10,000RPMs and not blown their motor. Some how, I have doubts about that and I wanted to do some internal work on my car so that I could safely attain that higher rev limit. What should be done other than Valves, valve springs, and retainers?

Doom325

You shouldn't mod your car just so you can have higher revs Just because you can rev that high doesn't mean you're going to make power up there

5hif7

In theory all you need are valve springs and retainers. Doesn't mean other **** won't happen up that high. Doom is right though.

jakeiscool

titanium retainers. but like he said, no need to rev past 8200 on any h22

BB6racer

i agree that you may want to look into a better valvetrain, and on top of that a better balanced and maybe even lighter bottom end with some nice sleeves and piston rings. and you should look into getting longer rods so your engine will handle the revs safer. but i think more power could be made with higher revs and proper tuning. you will have to get an ecu that has maps for revs that high. if you can do everything right and safely, there is defenitely some power to be made up there. the higher a naturally aspirated motor revs, the more power it makes. theres a reason race cars rev 10k+. full out drag cars rev higher than 10k and make tons of NA power. indy cars and sport bikes rev to like 16k and make tons of NA power. its all about doing it safely, doing it right, and TUNING IT!

edulerp97

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Doom325 &raquo;</TD></TR><TR><TD CLASS="quote">You shouldn't mod your car just so you can have higher revs Just because you can rev that high doesn't mean you're going to make power up there</TD></TR></TABLE>

That's fo sho.... In less you have a stage three cam shaft..even if that you still don't need to rev that high...

bad-monkey

I'm not sure if anyone can positively say at what point a given engine will stop making power. I'm sure that with the right parts an h22 could make power at 22,000 rpm.

That said, is it practical to rev to 10K? probably not. You don't let rev limits determine your power, you let the power determine your rev limit. If you're on the dyno with stock fuel cut off, and it looks like you're still making power at fuel cut, then it might make sense to rev it out another thousand revs and see...

this is something you and your tuner should determine.

The_Sober

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bad-monkey &raquo;</TD></TR><TR><TD CLASS="quote">I'm not sure if anyone can positively say at what point a given engine will stop making power. I'm sure that with the right parts an h22 could make power at 22,000 rpm. </TD></TR></TABLE>

Absolutely. Given light enough internals, and appropriate carburation, you can make a (theoretical) infinite amount of horsepower.

Torque, however, is another story...

Tomakit

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xxxdjfrostxxx &raquo;</TD></TR><TR><TD CLASS="quote">I've heard from some people that they've flashed their H22 ECU and raced at 10,000RPMs and not blown their motor. Some how, I have doubts about that and I wanted to do some internal work on my car so that I could safely attain that higher rev limit. What should be done other than Valves, valve springs, and retainers?</TD></TR></TABLE>

You're gonna get flamed around most parts of h-t if you just say that you wanna spin to 10k for no good reason.

a) because stock, the motor makes no power up there
b) why do you wanna spin to 10k?
c) h22 trans doesn't like to shift at high rpm's

Speedra500

ok, it looks like everyone made some good points about why you shouldn't rev to 10k rpm, it is highly unpractical for everyone for starts, and also Sober_John posted about making hp but not torque even though they are related to eachother, the advantages of a high reving engine over its counterpart is the fact that you it fires significantly more times in a given to thus creating more power when properly tuned, also higher revs will allow for shorter gear ratios to increase actualy wheel torque and acceleration. The problem is getting your motor, especially the h22 to be able to reach those high revs the main problem is the piston speeds at those rpm with a 90.7 mm stroke, the R/S ratio of the h22 is also not the best for extremely high rpm, another great concern is strong lightweight rods and pistons, there are lots of possibilities such as offset grinding F or H series crankshafts, the F20B crankshaft with a 88 mm stroke is more well suited for higher rpm from the factory than the H22, and strong lightweight aftermarket rods are ideal as rod stretch becomes more of an issue and balancing is also an important factor, and ontop of all the internal work you have to do, you'd also have to make your head, intake, and exhaust system flow enough air for the rpm you desire

Tomakit

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedra500 &raquo;</TD></TR><TR><TD CLASS="quote"> the advantages of a high reving engine over its counterpart is the fact that you it fires significantly more times in a given to thus creating more power when properly tuned, </TD></TR></TABLE>

No. The reason that our engines make power higher up in the rpm range is not just because they can rev that high, it's their ability to make torque out that far. Not simply "fires significantly more times in a given to thus creating more power when properly tuned".

flyrod

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xxxdjfrostxxx &raquo;</TD></TR><TR><TD CLASS="quote">What should be done other than Valves, valve springs, and retainers?</TD></TR></TABLE>

To rev that high more than once I think you'll also want lighter pistons, and stronger rods. Destroking would help things too. And, as others have mentioned, making power up that high is questionable. Seems like most H-series enthusiasts are having more luck with boring/stroking. If you do build a 10k H22, please let us know how it goes, I think that would be interesting.

The_Sober

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedra500 &raquo;</TD></TR><TR><TD CLASS="quote">ok, it looks like everyone made some good points about why you shouldn't rev to 10k rpm, it is highly unpractical for everyone for starts, and also Sober_John posted about making hp but not torque even though they are related to eachother, the advantages of a high reving engine over its counterpart is the fact that you it fires significantly more times in a given to thus creating more power when properly tuned, also higher revs will allow for shorter gear ratios to increase actualy wheel torque and acceleration.</TD></TR></TABLE>

hp is calculated as a function of torque--or more appropriately as a function of work over time. Given a high enough rpm, you can make more horsepower out of the same displacement without torque increasing. This is all theoretical, of course, it would be impossible to create an infinite RPM gearbox. And the less torque you have, the harder it is to get the car going from a dead stop. This is why it's easier to launch a h22 than a b16...

I'm rambling again...sorry.