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Old 09-28-2018, 01:14 PM   #1
Join Date: Aug 2018
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F with H internals

I couldn't find the answer in any of the threads, so here goes...

Destroked f23a(1) 87mm bore
stock H23a1 replacement pistons
H23A bluetop Crank and Rods

Would it work?

Going for a smog friendly DD, GT

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Old 10-13-2018, 09:44 PM   #2
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Old 10-14-2018, 12:00 AM   #3
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Is there a purpose for wanting to bore the engine other than to fit the larger H23A1 pistons? More specifically, what I'm asking is if increasing the displacement is the goal and the pistons are a means to that end, or, do you find the resulting compression ratio of that combo ideal and it necessitates a bore increase?

Regardless, there are two things you're likely not considering. One, the H23A1 pistons use a press-fit pin, and the H23A VTEC rods are compatible with floating pins. The rod bushing would need to be taken out to new "floating" clearances. Also, the H23A VTEC rods are unique in the fact that there are actually 141mm instead of 141.5mm like the H23A1 and F22s. This is because Honda wanted to use a 31mm tall piston as is used in the H22A. So since the stroke and rod length is ideal for a piston of 31mm, putting a 31.5mm piston in would drop it .020" in the hole. While the resulting compression ratio on paper is decent, it wouldn't have good quench area qualities.

I believe a different piston could be found that is more ideal.

The USDM H22A4 piston would solve the quench issue while maintaining a similar compression ratio to what the combination in the OP would have. It would also be compatible with the wrist-pin of the rods. H22A Type-S pistons would do the same, only with a slightly higher compression ratio.
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