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[98vtec]

Cranks

F22 - 50mm mains, 95mm stroke
F23 - 55mm mains, 97mm stroke
H23a1 - 50mm mains, 95mm stroke
H22a/a1 - 50mm mains, 90.7mm stroke
H22a4 (1997) - 50mm mains, 90.7mm stroke
H22a4 (1998+) - 55mm mains, 90.7mm stroke - some 98 motors were produced in 97 and have 50mm mains so be weary of what you are buying
H23A - 55mm mains, 95mm stroke

all use the same rod journal diameter at ~1.8890"/47.98mm besides the F23

Crank pulley bolts

    * 92 F22 - 14mm
    * 93 F22 - 14 and 16mm
    * 94 F22 - 16mm

The F22 and H23 cranks are going to have the same bolts between the years since they have the same part numbers....right?

    * 1992, 14mm F22/H23 crank part number is 13310-PT3-315
    * 1993 has options for both cranks
    * 1994, 16mm F22/H23 crank part number is 13310-P0A-000

Rods

Length
H23/F22 - 141.5mm
H22a - 143.0mm

Pistons

Compression height
H22a (non type S) - 31.01mm

Intake Manifold/Throttle Body

F20b (auto)
Throttle plate - 55mm
Manifold inlet - 58mm

H22a
Port ID - ~53mm (each one is a little different)
Port spacing - 40.26mm
Throttle plate - 60mm
Throttle Inlet - 62mm
Manifold Inlet - 62mnm
Injector port Diameter - 11.56mm
Primary runner length - ~11"/279.4mm


I've got some more stuff in storage to measure and I'll get to that the next time i go out there. 

[chris]

Automatic f20b manifold/throttle body combo is uber gay



55mm sohc throttle body
57mm plenum manifold


Theres your loss in power. Add h22a manifold/throttle body you have a 5spd f20b thats all kids.

[98vtec]

Automatic f20b manifold/throttle body combo is uber gay



55mm sohc throttle body
57mm plenum manifold


Theres your loss in power. Add h22a manifold/throttle body you have a 5spd f20b thats all kids.

interesting.  Do you have any idea why they decided to limit the auto so badly?

thanks for the addition, i'll slide it in there

[chris]

I have no idea



I mean a sohc 55mm throttle body on that motor is a joke. The plenum is just has bad. I dont get it its the only automatic motor I have ever seen from honda where they really messed with the intake/throttle body so much,killing the top end power of the f20b head.



Bottom half plenum has same bolt pattern has all 3 piece h series manifolds so a top half off a h22a can be interchanged.

[98vtec]

i take it the manifold inlet was just reduced and they left the rest alone?  I was just looking through some pictures, externally it looks the same as the h22a.

[chris]

Just went and measured it the inlet is actually 58mm hadnt looked at it months. Ill do some measuring here in a couple days along with pics of the auto f20b manifold vs the h22a jdm manifold