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^VTEC ADDICT!
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Discussion Starter · #1 ·
im wundrin how much it would cost roughly to get a k20a block bored out from 3.38 to 3.43, so i can put(2.2l s2k pistons, or tsx piston in there) and still have the same redline?
 

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First off, why aren't you using mm?

Second, if you'll search, you'll see that edo said you can't use s2k pistons in a k20/k24 block.
 

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More interesting info I learned - S2K pistons can't/shouldn't be used in K-series blocks since it has iron lined sleeves. The S2K pistons were designed for an aluminum-matrix cylinder. I'm not a metallurgist, but this is the information conveyed to me by a respected and reputable source.

-Ron


Why not just buy forged pistons anyway?
 

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Skepticism Extraodinaire
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Yeah, if you are going that far I wouldn't put some stock pistons back in there.
 

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^VTEC ADDICT!
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Discussion Starter · #5 ·
noone answered my question yet, how much to get it bored estimeted. and where can i find other pistons that can withstand high revs, sorry i didnt convert to mm, but i dunno what 3.43 is in mm
 

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Why are you asking, you are the one who posted it. :shakehead
 

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Just Another Day
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Well if you bore it out to 2.2L, you should see a torque increase, if you want to rev higher, you're going to need new cams, and probably some new valves and valve springs, Not too sure the stock vavles can take 9k+ dailly without bending or breaking.

About the pistons, you're better off getting forged over S2K stock.
 

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ILikeFastCars&FastWomen
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added explanation

You will need tuning if you haven't thought about that yet, the K-pro and several hours on the dyno should do the trick.

Cost, I'm not sure but to straighten this out a bit:
3.3858in = 86mm (stock bore)

It looks like he wants a .050" over bore so thats
3.4358in = 87.2693mm

Maybe you should just ask for a 2mm overbore, which = 0.0787 in.
Your final bore would then be 3.4646in or 88mm

Please just use metric, its so much easier.

If you want to get 2.2L of displacement your best bet might be to increase stroke, you could go with 88mm bore x 90.7mm stroke = 2206cc / 2.2L

In comparison, your redline would go down, but stronger internals will help that.
86.0mm stroke @ 8,800 = 4,965 ft/min. Stock K20A
90.7mm stroke @ 8,342 = 4,965 ft/min. Stroked K20A

When you stroke a K20 your r/s Ratio will be decreased because you will need shorter connecting rods. If you use a K24 you will see two differences, it has a stock bore of 87mm (+1mm vs. K20) and has a taller deck height which gives room for longer rods to go along with the stroke. The K20 stroker and the K24 hybrid will both be good setups.
 
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