mgags7

I wrote this on another forum a while ago.....i figured why not post it over here....

Use this thread as your resource for any hybrid h/f series motor, the title of each section will be a link to the write up explaining the motor assembly.

This is all assuming stock 87mm bore and oem headgasket. I didnt do anything with the f series pistons, i didnt feel it necessary to ever use those.

All figures in inches unless otherwise denoted

Every h and f block has the same deck height of 8.643 inches, you can use either block if you want, but frm blocks are lighter

<FONT SIZE="4">props to prelittlelude and piratemcfred they were the guys that innovated all this stuff</FONT>

<u>Crank/Rod Options</u>
H22 - 90.7mm stroke - 5.633 rod length
H23/F22 - 95mm stroke - 5.572 rod length
F23 - 97mm stroke - 5.551 rod length

<u>Piston Options </u>
USDM H22 - 1.221 compression height / -2.0cc dome
JDM H22 - 1.221 compression height / 1.7cc dome
H22 Type S - 1.221 compression height / 3.9cc dome
USDM H23 - 1.203 compression height / -10.5cc dome

<FONT SIZE="2"><u>OEM Piston Swaps</u></FONT>
H22
Compression Ratio with:
H23 Pistons: 8.52:1
USDM H22 Pistons: 10:1
JDM H22 Pistons: 10.6:1
H22 Type S Pistons: 11:1

H23
Compression Ratio with:
H23 Pistons: 9.8:1
USDM H22 Pistons: 11.67:1
JDM H22 Pistons: 12.47:1
H22 Type S Pistons: 13.01:1

<FONT SIZE="3"><u>COMBOS!!</u></FONT>

The classic h23 vtec:
Head: H22 Vtec
H23/F22 Crank and Rods
95mm stroke * 87mm bore = 2258.9cc

Compression ratio with:
h23 pistons: 9.3:1
usdm h22 pistons: 10.5:1
jdm h22 pistons : 11.1:1
h22 type s pistons: 11.53:1


F23 DOHC Vtec
Head: H22 Vtec
F23 Crank and Rods
97mm stroke * 87mm bore = 2306.5cc

Compression Ratio with:
USDM H23 pistons: 9.86:1
(note: h22 pistons put it way out of the hole, claying is necessary to insure that there is no valve to piston intersection)
USDM H22 pistons: 11.72:1
JDM H22 pistons: 12.51:1
H22 Type S pistons : 13.04:1

G23 Non-vtec
Head: H23 non vtec
F23 Crank and Rods
97mm stroke * 87mm bore = 2306.5cc

Compression Ratio with:
USDM H23 pistons: 10.41:1
USDM H22 pistons: 12.53:1
JDM H22 pistons: 13.46:1
H22 Type S pistons: 14.08:1 (lol wow)

whew....put your pencils down....

If I messed up anything let me know, i did a lot of calculations, i probably messed something up....

The Weather Man

Great information. Bookmarked for future reference.

PirateMcFred

Double post?

https://honda-tech.com/zerothread?id=1482111

mgags7

good call pirate....im an idiot....

some kid asked a question last night that would have been easily answered by this....and i guess i thought i never posted it...

98vtec

poser

mgags7

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">poser</TD></TR></TABLE>

e-meanie

98vtec

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">e-meanie </TD></TR></TABLE>

, i just kiddin