hellothere

Is is feasible to increase the maximum engine speed for the 2.2L version S2k?

How could it be done?

What adverse effects would this cause?

How could you circumvent the problems that might arise?

Jaydem

you would have to get either your oem ap1 ecu chipped our you would have to purhcase an aftermarket ecu. (spoon/mugen) not sure if they make one for the 2.2 yet. Also not sure if it would cause any problems. As far as I know the internals are the same in the 2.2 as they are in the 2.0. I simply think Honda Co. lower the redline in order to cut the number of engine failures at high rpm!!!

Jay just my .2

Islander

Honda claims that with the lengthened stroke, the rev limit had to be reduced to keep piston speed within acceptable limits and to avoid damage to the reconfigured rotating assembly. All that aside the 2.2L is a wonderful engine maybe you should leave it alone.

hpark

i believe max piston speeds in the 2.2L have been INCREASED...less RPM but more distance

00CivicSi

I'm not expert and have limited experience with these engines... BUT, it was my understanding from previous topics that the piston speed in the 2.2L at 8000 RPM was slightly lower than the piston speed of the 2.0L at 9000 RPM. However, I do agree that at some point (I think in the press release) that Honda stated the intent of the lower redline was to keep the piston speed acceptable so not to cause damage.

Other than some changes to the connecting rods and the crankshaft to increase the stroke I think the internals are the same. One other possible change that I remember hearing about on Motorweek was that the cam profiles have been changed just slightly, which contributed to the slight increase in the compression ratio (in addition to the increased stroke).

Again... I don't know these things for sure, but I'm starting to get the impression that a lot of these magazines/TV reviews are grossly misinformed about some of the details.

Sonic_S2k_04

I asked this same question when i first got my car. And after pages of responses, we came to the conclusion ... That withought upgrading to reinforced internals... The piston speed would be to high. Hense bumping it up 1000k is a BIG project. You could go as far as bumping it a couple Hundred RPMS with an emanage.


Either way u look at it, its not as simple as an ECU swap. Good luck to you in your Endevor for 9k....

Dont let those 03's fool you, we make more power with less RPM's anyways. =)

PilotKD

Rev limiter kicks in at 8200 on the 04's, not 8000. If the rev limiter on the <MY04's is at 9000, it's only an 800 rpm difference. If the difference between the car running safely and blowing the motor lies within this 800 rpm, I don't feel very comfortable bringing it to the rev limiter every day as Honda would be cutting it very close to destruction.

hellothere

i thought it was 1000 RPM difference because in 00-03 model years you can hit 9000 and let it sit there for two flashes before you have to shift

Sonic_S2k_04

[QUOTE=PilotKD,Jul 30 2004, 02:29 PM] Rev limiter kicks in at 8200 on the 04's, not 8000.

steven975

yea i think the limiter is like 9200 on the F20C

anyway, the piston speeds of the F22 and F20 are about equal at 8200 and 9000, respectively. also, it's not just piston speed...due to the longer stroke, second order vibration is MUCH more pronounced at equal speeds.

the crank is a little wider, and the rods are a little shorter to stroke it. i think the pistons are slightly different in shape, which contributes to the compression ratio. also, i believe the intake cam is lower lift/duration and the exhaust is higher lift/duration...not sure though.

also, the F22 uses a dummy head to hone the bores to minimize distortion when a head is mounted. also the cylinder liners are no longer iron, they are a carbon/aluminum mixture...just like the NSX. they may have carried these changes in the newer F20C...i don't know.