2.4 Long rod rev limit suggestions?
Jun 30, 2011, 01:12 PM
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And the man has spoken. I knew it was over 9400rpms
Let's get some data-
Kevin very clearly says 9650rpm in his comments in the stroker thread in the Evo Engine drivetrain. I have yet to replace the rod bearings, I attribute it more to tuning style than anything. Lower cylinder pressure is less force on the bearing which translates into longer life.
Kevin checks his bearings often doesnt mean that he replaces them often.
I use Honda as an example, the GSR is 1.58 and revs 10,200 though they breathe well up there with any given turbo combo compared to a 4G63. Ours are 1.56 which is close enough it should follow similar rules. The oil pump doesnt magically fail at any given rpm in our motors.
To THUB, your turbo choice already precludes needing to rev higher than 8k or so as the car isnt going to make power up there anyway. My motor makes peak power at 7800-7900 and I follow the 5% rule on shifting (Pro Stock rule) which is 8300 and then rev 4th to what it needs.
Kevin very clearly says 9650rpm in his comments in the stroker thread in the Evo Engine drivetrain. I have yet to replace the rod bearings, I attribute it more to tuning style than anything. Lower cylinder pressure is less force on the bearing which translates into longer life.
Kevin checks his bearings often doesnt mean that he replaces them often.
I use Honda as an example, the GSR is 1.58 and revs 10,200 though they breathe well up there with any given turbo combo compared to a 4G63. Ours are 1.56 which is close enough it should follow similar rules. The oil pump doesnt magically fail at any given rpm in our motors.
To THUB, your turbo choice already precludes needing to rev higher than 8k or so as the car isnt going to make power up there anyway. My motor makes peak power at 7800-7900 and I follow the 5% rule on shifting (Pro Stock rule) which is 8300 and then rev 4th to what it needs.
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