first check out this post:

https://honda-tech.com/zerothread?id=678718

the f23 has a 97 mm stroke. h23/f22 has 95mm. i beleave the h22 is around 91mm.

i know that when using h23 crank h22 rods, you must move the wristpin up in the pistons, but how much...is it just the difference in stroke? also is it still possible to use the h22 rods w/f23 crank?

also where does the compression hight difference come into play.

so using a 97 mm stroke w/89 or 90 mm bore, what displacement will this be?

 

try talking to SOHCArchangel here on H-T if no one replies to your question.
https://honda-tech.com/zero...=4632

He's kind of my crazy, number crunching, theory loving, this would probably work "if only", friend.

I know he's been entertaining this idea for a while. He tried to give me an F series crank to bribe me to try what you're trying on one of my spare blocks. I said no thanks.

I try to stay away from things like this. I have enough troubles on my own.

 

BORE (mm) X BORE (mm) X STROKE (mm) X .0031416 = Engine Displacement in CC's

Keep in mind rounding off can throw the final displacement off by a little bit, just use sig figs and you'll be fine.

H22 rods (143mm) with a 90mm bore and 97mm stroke would theoretically yield a 2468.35 CC displacement.

A 89mm bore with the same specs yields a 2413.80 CC displacement.

 

well...f23 rods must be like....139mm or so...so the H22a rod must be a good 4mm longer...is there 4mm of room to drill a piston pin higher?

2point6 already did this with another guy, pretty sure. You need anewer H22A4 block for this as far as I know. Bigger mains. He may know something.

I hope you don't plan to rev it too high

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by satan_srv &raquo;</TD></TR><TR><TD CLASS="quote">well...f23 rods must be like....139mm or so...so the H22a rod must be a good 4mm longer...is there 4mm of room to drill a piston pin higher?

2point6 already did this with another guy, pretty sure. You need anewer H22A4 block for this as far as I know. Bigger mains. He may know something.

I hope you don't plan to rev it too high </TD></TR></TABLE>

as far as the 4mm, i dont think so. maybe ill use h23 rods. i need to figure the r/s ratio for different combos, and see whats worth it. do you just devide rod leanth by stroke to figure it out?

i thought i heard it had bigger mains, if it does it will depend on the condition of my block. if my block is still salvageable i wil just go w/h23 crank, since i have a sleeved a1 block already. if its not, i will go f23.

as far as reving high, only as high as i need. anyone know the factory redline of the f23? i will do my best to make this as safe as possible. i.e.-perfect balance, main studs, whatever i can. anyone ever heard of cryotreating a crank? after seeing the h23 crank that came out of your engine satan.

i was thinking about getting some custom ground turbo cams, tell them i want to peak around 7k, that way i dont need to rev as high, what are your thoughts on that?

 

The max you can move a H22 wrist pin up is .268" before you get into the oil ring

Heres a little math for you

Knowing you can use an H23 crank rods and H22 pistons with enough clearence.......

The F23 crank has a 2 mm longer stroke than a H23 crank or .0787402" Now Subtract that from the .268" that you can move the pin up and you are left with .1892598"

Now you can add that to the H23 rod length of 5.571 and you get a rod length of 5.7602598. A rod longer than an H22, but with the increase in stroke to 97mm (or 3.8188997) your rod/stroke ratio is now 1.508355875 Slightly better than an Normal H23 r/s ratio And like Gude said with an 89mm bore you can get a true 2413.80cc of displacement with a little better r/s ratio than a normal H23.

Now if you get exact and know your gasket thickness and dome or dish volume, plus lift on the cams you may actually be able to increase the rod length a little further especially if you are running a low compression motor on stock H22 cams...

-Jeff-

edit: fastludeh22 compression height and wrist pin location are the same thing compression height is the distance from the center of the pin location to the deck of the piston


Modified by Jeff33S at 2:28 PM 11/19/2003

 

oooh! a stroked motor w/ a better r/s ratio than the H23 VTEC! I likes!

A little later I'll try lookin up all the numbers for all this and see what's going on.....where can one buy an F23 crank?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeyKrus &raquo;</TD></TR><TR><TD CLASS="quote">oooh! a stroked motor w/ a better r/s ratio than the H23 VTEC! I likes!

A little later I'll try lookin up all the numbers for all this and see what's going on.....where can one buy an F23 crank?</TD></TR></TABLE>

you have already started the h23 vtec project. since the h23 has 2 mm(~.079) shorter stroke, you can add that to the leanth of the rod and have even better r/s ration then i will.

im not doing #'s now, but closer to that of the h22, maybe even better.

 

true, i've already started this project, but a bigger-stroke motor that is well-designed is always a plus in my book! Wish I had the $$$ to do a little experimenting.....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeyKrus &raquo;</TD></TR><TR><TD CLASS="quote"> Wish I had the $$$ to do a little experimenting.....</TD></TR></TABLE>

Dont we all I havent even finished one build and I'm already planning another

-Jeff-

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jeff33S &raquo;</TD></TR><TR><TD CLASS="quote">The max you can move a H22 wrist pin up is .268" before you get into the oil ring</TD></TR></TABLE>
This is true of you are using the stock diameter wrist pin. However a smaller diameter wrist pin can be used as well as getting custom pistons that have a "tighter" ring pack.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point6 &raquo;</TD></TR><TR><TD CLASS="quote">
This is true of you are using the stock diameter wrist pin. However a smaller diameter wrist pin can be used as well as getting custom pistons that have a "tighter" ring pack.
</TD></TR></TABLE>

Yea that .268" is with stock sized pin sorry forgot to mention that, cant let everyone know all the secrets lol