Turbo head build, light weight vs aggressive cams
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Joined: Jun 2018
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Turbo head build, light weight vs aggressive cams
Would really appreciate some recommendations. I'd like to build a head that will rev to 9k rpm for a turbod ap2. I'm thinking titanium retainers and keepers to lighten the valvetrain ever so slightly, getting new oem ap2 springs, and some lightweight forged valves again just to lighten valvetrain. Or is it recommended to get some turbo specific cams, and stiffer springs and rev it out to 9.5k? Trying to decide between the two options would like to hear from experienced builds before i decide. Do aftermarket s2k cams affect drive ability at all, do they have their own high and low v-tehc cam profiles?
Joined: Sep 2008
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From: Bay Area, CA
I think you’re going to be limited to rev’n that high due to having an AP2 bottom end. At those speeds, there will be a lot of stress on the road bolts at least. You can probably due it for a short period of time. I had an AP1 short block in my AP2 while my original block was getting built. I took that up to 9k with no problems. That was with a supertech valve train. I wouldn’t dare trying that on my AP2 short block.
Joined: Oct 2007
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From: Los angeles
people generally dont run aftermarket cams. Everyone that has tried have always went back to the stock cams. 9,000 rpm is pleanty and most poepl also dontrev higher. If you have over 500whp you should extend the gearing with a lower final drive. I run a 3.9 final drive with a 26 inch tall tire and with a 9000rpm redline my gears are already pretty long.
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AP2 crank, roughly 9,500rpm with full Ferrea valvetrain. Edit: forgot I actually have the BC springs/retainers.
Last edited by hatrickstu; Jul 11, 2018 at 05:23 AM.
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BrianCrower.com | RunBC.com // Honda // F20C / F22C.
Those dyno comparisons are straight from Real Street.
Those dyno comparisons are straight from Real Street.
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The F22 top and bottom end will take 9k rpms. The head is already better equipped then the F20 to handle the rpm, but the cam profile doesn't breath there quite as willingly. Ap1 cams would take care of that. As for the bottom end, eventually the piston side loading will ovalize the cylinders and you will start to lose compression/wear over the mid term. Then again even the F20 have that issue, it just takes longer because the rod angle isn't as severe as the F22. I put about 80k miles on a supercharged F22 with an Ap1 ecu and it saw 9k often.