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Build suggestions for high-revving NA build?

 
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Old 06-23-2017, 06:08 PM
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Build suggestions for high-revving NA build?

Hello! I don't currently have a prelude, but i have every intention of buying two 5th gens, one with a bad motor and one with impact damage, to swap the good motor into the otherwise fine car (based on CL prices, i can do this for just over a grand, plus i have a parts car) and then build the remaining motor for high RPM action. I'm curious as to what work would need to be done to an H22A4 for a 10000rpm redline. I don't need more power, but i expect the effort of moving peak power up towards the new regime will net me more anyways, which is a plus.

As it stands, I'm expecting a list like this:
Balanced/Lightened/Forged Pistons/rods/crank
Lighter valves
Higher spring rate springs
Stronger/lighter retainers
Cams suitable for moving power up the Rev range
Ported head (for flow and to not choke the motor near redline)
ITBs for flow reasons (also cause velocity stacks look dope)

Am i forgetting anything/ does the H22A4 have any idiosyncrasies i should know about? What brands should i be looking at for each of these? I'm used to working on old BMW and Merc stuff, and while i have a 2001 Civic Lx sedan I've never done anything more than maintenance and don't know much about Honda motors in any sort of detail. I just love the manual trans in my Civic and decided i wanted something sportier with that kind of tranny. I know an S2K is the end-all-be-all on that front, but I'm just not a fan of how it looks, and even with 10K into an H22A4 I'll still be in the lower ranges of S2K price ranges.

Thanks!
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Old 06-24-2017, 04:15 AM
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Re: Build suggestions for high-revving NA build?

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Originally Posted by Jtmote View Post
I'm curious as to what work would need to be done to an H22A4 for a 10000rpm redline.
Everything needs to be upgraded but still 10000rpm sounds like time bomb/kamikaze thing.

Stage 2-3 cams and for those you also need very high compression pistons and for those sleeved block since you cannot get that high comp pistons for stock cylinders (Mahle gold 11,5:1 for stock cylinders VS Wiseco 89mm/JE 87mm 12:1 for sleeved) - stock FRM cylinders are not that good anyways

"Recommended: High-compression, Engine Management, deep valve pockets."

Skunk2/Brian Crower cams & valvetrain, Wiseco/JE (with Darton sleeves) or Mahle pistons, Hondata S300, custom exhaust, bigger injectors, better fuel pump, some shop who knows proper headwork....

Might still be that your engines life is not that long... and you might want LSD transmission and look more into traction/suspension also.

NOT CHEAP.

but is it worth it? I think no, you'd be better of with K20/K24 Civic/TSX (Accord)/RSX (Integra), you can make more power with cheaper cost with those engines
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Last edited by TypeT; 06-24-2017 at 05:07 AM.
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Old 06-24-2017, 12:10 PM
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Re: Build suggestions for high-revving NA build?

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Originally Posted by TypeT View Post
Everything needs to be upgraded but still 10000rpm sounds like time bomb/kamikaze thing.

Stage 2-3 cams and for those you also need very high compression pistons and for those sleeved block since you cannot get that high comp pistons for stock cylinders (Mahle gold 11,5:1 for stock cylinders VS Wiseco 89mm/JE 87mm 12:1 for sleeved) - stock FRM cylinders are not that good anyways

"Recommended: High-compression, Engine Management, deep valve pockets."

Skunk2/Brian Crower cams & valvetrain, Wiseco/JE (with Darton sleeves) or Mahle pistons, Hondata S300, custom exhaust, bigger injectors, better fuel pump, some shop who knows proper headwork....

Might still be that your engines life is not that long... and you might want LSD transmission and look more into traction/suspension also.

NOT CHEAP.

but is it worth it? I think no, you'd be better of with K20/K24 Civic/TSX (Accord)/RSX (Integra), you can make more power with cheaper cost with those engines
As I mentioned, this isn't about chasing power. It's not supposed to be an all-motor big power build, if I hit 200 WHP I'd be happy. Also, I say 10000 RPM because I like 5 figures, but realistically it's about squeezing rev range out.

If I'm gonna be going so far as sleeving, what are the limits of boring on this block? And at this level of modification, is there any way to fix, permanently, the oil consumption I've heard about? (might as well do that too if I'm gonna be stripping a block down to the bare casting)
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Old 06-24-2017, 02:59 PM
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Re: Build suggestions for high-revving NA build?

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Originally Posted by Jtmote View Post
As I mentioned, this isn't about chasing power.
you have to understand that there is no cams which stretch "stock" power up there (atleast no aftermarket ones, about custom I dont know)

if you want to get your power band higher - to do that you need "better/bigger" cams to get there and higher compression pistons to make em work and more power it makes way up

Quote:
Originally Posted by Jtmote View Post
If I'm gonna be going so far as sleeving, what are the limits of boring on this block?
With stock block you have 2 piston choices: Type S 11:1 and Mahle Gold 11,5:1 and less you bore/hone FRM block the better. Some say you can bore it 1mm but atleast Honda recommends that only for next oversize which is 87,25mm (or 87,50mm)

Quote:
Originally Posted by Jtmote View Post
And at this level of modification, is there any way to fix, permanently, the oil consumption I've heard about? (might as well do that too if I'm gonna be stripping a block down to the bare casting)
well it depends how your engine is built (how well honed etc) and how well you run it in... H22's tend to consume some oil - some more then others

I could think that with sleeves your block is more healthy than with block with FRM and you can choose pistons and sizes more freely
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Last edited by TypeT; 06-24-2017 at 03:13 PM.
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