hey guys i have been reading and looking around and tossing some different ideas around, and here is what i have come up with...

h23a, stock iron sleeves(correct me if im wrong)
bore is 87mm(h22) rod length is 141.5(F22)mm
and it uses the same crank as the f22 and rod length is the same???

so its basically an h22 with an f22 crank, rods and h22 pistons, with the h22 vtec head!

run some forged f22 rods, with some forged h22 pistons. according to paper it should be drop in parts with the usual brush hone to clean up the cylinders, and new bearings...

bottom end should be pretty strong, if its possible... has anyone else thought of this?

 

If you're talking about the H23A vtec, you have a few things wrong.

First off, NO H series has iron sleeves. They ALL have FRM sleeves which are not compatible with regular forged pistons. The only company that makes pistons ready for FRM sleeves is Mahle.

I'm 50% sure that the rods and pistons are different from any other H series. Meaning the rods aren't exactly 141.5mm and/or the pistons aren't the same compression height as the h22. Also, the crank has 55mm mains vs 50mm mains. The bottom end is no stronger than a regular H22 or h23 non vtec, maybe healthier since they only came auto.

 

The F20B has iron sleeves. It looks basically identical to the H23A so you may have them confused. slightly smaller bore and shorter stroke than an H22