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Discussion Starter · #1 ·
So I'm doing some web surfing at work today, and I find a page listing the valve lift of the Prelude Type-S cams. So I get curious because I plan to get stage 2 cams from Crower (63422A). The lifts for the Prelude Type-S cams are Intake=0.480 and Exhaust=0.441. Crower stage 2 lifts are Intake=Exhaust=0.465.

I know I'm over looking valve duration and ramp rates. So does anyone have anything to add about which would be better. A list of pro's and con's maybe?

Thanks,
Brian
 

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heres a pro....you wont need spring and retainers with the Type S cams. you prob wont see as much of a gain from the Type S ones but its cheaper because you wont need the springs and retainers.
Also, you know you cant go wrong with genuine honda parts.


If you want Type S cams....PM cause Ill sell mine for $375.
 

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aglude said:
So I'm doing some web surfing at work today, and I find a page listing the valve lift of the Prelude Type-S cams. So I get curious because I plan to get stage 2 cams from Crower (63422A). The lifts for the Prelude Type-S cams are Intake=0.480 and Exhaust=0.441. Crower stage 2 lifts are Intake=Exhaust=0.465.

I know I'm over looking valve duration and ramp rates. So does anyone have anything to add about which would be better. A list of pro's and con's maybe?

Thanks,
Brian
go the crower :D
 

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Discussion Starter · #6 ·
how high can I safely raise the rev limit with a crower valve train upgrade? other upgrades to consider (ignition)?
 

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with a new engine management system

you can raise the rev limit with aftermarket ECU's and engine management systems. HONDATA, MOtec etc
 

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I don't think it's wise to raise the limit too high on a Prelude. I can't say what the limit would be but if you aren't making any more power, why raise the limit (to stay in vtec all the time?). Are you going to just be racing with this car? I've got mine set to 8000 with the S200 with springs and retainers.

And no you don't NEED the springs and retainers if you keep the stock rev limit with the stage2 stock idle lobe cams. Why not upgrade it though if you are working on the car anyway?
 

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I recommend buying the stage 2 cams from crower....they are good cams from what I hear.....also I would use the stock valve springs and retainers...no need to change them. I wouldn't raise the rev limit. its there for a reason.
 

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Discussion Starter · #11 ·
although the crower stage 2 cams have different overlap numbers than the stock cams for increased high rpm performance. this should mean that the new torque curve doesn't fall off quite as fast as the stock curve, and with an upgraded ignition system, this should allow for more constant torque to be generated at high rpms, right? I'm trying to draw similarities to the ITR. and valve springs with higher spring rates would be needed to prevent valve float at high rpms due to higher cam ramp rates.

anybody dyno'ed a crower valve train and tried to play with their cam gears in stratuspheric rpm ranges?
 

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Discussion Starter · #12 ·
I'm not planning to race my car (it may still happen), but I do want to have make my engine have a split personality more than it already has. half the rpm's are subdued, and the other half are psychotic! I love the high reving nature of honda engines, and I want to push the envelope.
 
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