Hello


I have been thinking in a stroker kit for the future. they are building a 2.3L with a 90 mm bore and 90 mm stroke. I have been told that this kit is able to rev up to 8K-9K.
What worries me is the 90 mm bore. I read this from UL 3 yeras ago
https://www.s2ki.com/forums/index.php?showt...++stroke++stock



"Overboring the engine would not be too easy. Honda wanted to make this engine very compact, hence the FRM cylinders. You'd have to resleeve the engine with ductile iron (about $750) and even then I don't know if you could get much more than a 1-2mm overbore. 2mm would get you a 90 cc increase in displacement, so it probably isn't worth it.

UL"



Is 90mm bore too close to the limit?
What others thing should I take into consideration?
How I calculate de rod ratio?


thanks

 

I took my motor apart after running it for about 2 years under boost.. Anywhere from 14-23 psi, generally 14 for daily driving. After a while I noticed that it was smoking more. When I took it apart, the bottom end was perfect.. where was the flaw? Well -- I WILL TELL YOU SIR!!

BETWEEN THE CYLINDERS, it pushed passed the head gasket for a while, and there was carbon build up on the o-rings between the cylinders. Nowhere else did it push past the gasket.

So, using this knowledge, would you say that it would be good to reduce that space between the cylinders?

Anyways, I took the rest of the bottom end apart and it was in perfect condition, ever bearing, etc was perfect.. cylinders walls as well.

Chris

 

i do agree with the fact that the thin walls between the piston is not a good idea especially under boost....if u do overbore keep max it at around 89....i say leave that 1mm difference for "just in case" space....just in case u need to build the bottom over again...then u have that extra 1mm to play aroudn with..but the walls will b very thin...

 

No more boost for me. Want to keep NA way