Are the blocks the same?

Assuming I use H22 pistons, rods and crank in the H23a1 block, will there be any difference (drawbacks) to doing this? The H23a1 is a closed deck block.

Alternately, assuming everything is balanced, would it be wise to go with a H23 crank for more displacement? What are the drawbacks to this?

Thanks.

 

H22a4 has 55mm crank mains compared to the h23a1 with 50mm mains... You could use an h22a1 crank from the 92-96 prelude and the h22a4 form the 97 prelude only... Downside to using h23 crank/rods is a lower rod/stroke ratio(not so good for high revs)

 

Yeah, you can only use a H22A1 or 1997 H22A4 crank in a H23A1. The 98+ cranks have the 55mm mains.

Matching H22 pistons with a H23 crank and rods is a good way to make more power, although I've never seen a real breakdown of how much of that power comes from the displacement increase (You also get a healthly bump in compression ratio)

 

Sorry, missed some information.

I'll be using a crank with 50mm mains already so it's from a 92-97 block. Will also be using 11.89 comp pistons (H22) with the Darton Mid sleeve along with H22 crower rods.

Will that work? Will my compression and stroke still be the same as if I had use a H22 block?

 

Yep. The blocks are different because of their internals only.

 

Awesome. Thanks for your help!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by A Blue Lude &raquo;</TD></TR><TR><TD CLASS="quote">Yep. The blocks are different because of their internals only.</TD></TR></TABLE>

ehh .. yeah except for the fact that one is open deck and the other is closed deck.

the h23a1 and h22a1 blocks are identical and from the same casting. as far as the h22a4 you can move almost all parts back and forth from an a4 to the h23a1, except that 98+ cranks.. also i belive a4 rods are floating wrist pins..

 

Yeah, I was talking about the A1, given that most A4s do have different mains. Although I can see how that wasn't clear.

Dimensionally though A4s are also almost the same deal.

 

Thanks guys.

Yeah, to minize downtime, I'm building another block. I have a H23A1 block and I'll be transferring H22 pistons, rods, and crank (with 50mm mains) to it. The closed deck design is just a plus.

I was going to try and use a H23 crank/rod combo with the H22 pistons but the pistons I have are already 11.89... don't want to go too high, it's a daily driver after all.