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Old 02-18-2007, 12:17 AM
SquallyZ06 SquallyZ06 is offline
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Default F22B vs H23a1

I have a 94 JDM with the F22b and I was just wondering if anyone could tell me the major differences between the f22B in the JDM and the H23a1 in the USD prelude?
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Old 02-18-2007, 02:05 PM
SHOOF SHOOF is offline
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Join Date: Aug 2005
Location: Orlando
Posts: 1,477

the H23 is a 2.3 L DOHC non-vtec, the F22B is a 2.2L DOHC non-vtec.
The H23 has Fiber Reinforce Metal (FRM) sleeves, which do not mix well with the standard forged piston usually required for boost (ie - J.E pistons, Wiseco, Arias, etc...) The F22B has iron sleeves which are a bit stronger, and will hold up to slightly more pressure in stock form.
Other than that I really don't know about the F22B, the h23a1 has a knock sensor, requires 91+ gas, and has an EGR system for emissions.
Does anyone know what other differences there are between the f22b and h23a1?

A few ppl have the f22b, but i personally do not.
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Old 02-18-2007, 06:31 PM
SquallyZ06 SquallyZ06 is offline
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yeah I have an f22b and had read a few different things online about them compared to the H23a1. Wow it takes premium in the states? Then again all gas over here is 93 octane, there is no such thing as regular or mid grade.
1994 JDM Prelude Si, F22B
JVC deck
JVC speakers
Short ram air intake
exhaust is next!!!
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Old 08-31-2007, 05:33 PM
ADR3NALIN31287 ADR3NALIN31287 is offline
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Join Date: May 2007
Posts: 18

well this is to my knowledge since I own a f22b and recently finished the vtec conversion. I'll start with wat the h23 and f22b have in common then wat are different about them.

same:block, stroke(95mm), cylinder head, intake manifold, exhaust mani.

h23: knock sensor, 87mm bore, frm sleeves, 9.8:1 compression

f22b: 85mm bore, iron sleeves, 8.8:1 compression, water jackets like a open deck design.. the head gasket is also extremely thick.

since the head gasket is extremely think i need to ask a question also. who can I go to for a custom head gasket for my f22b vtec. the stock f22b head gasket I currently have on now works fine for now. but is extremely thick. i haven't measured it but its like 2x thicker then h22 head gasket maybe more. so im sure my compression is extremely low since the h22 head has larger cylinder volume. so im assuming my compression is anywhere from 7.8 to 8.5 its kinda hard to figure that out. but from compression tests i have 155 psi across.. The car has ran but I'm waiting for more cash to upgrade my igniton system. then i can correct the lil bugs I have.
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Old 08-31-2007, 05:38 PM
ADR3NALIN31287 ADR3NALIN31287 is offline
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Also Im having extreme spark problems. sometimes it works and sometimes it doesn't.. before this f22bvtec project I had these issues with the f22b alone. the spark would work sometimes and then it wouldn't i changed the distributor and coil and then it worked fine. I had alot of distributors laying around and alot of ecu's and coils. last time it was the ecu. it fried.. well now i completed the project and sometimes i will get spark and sometimes i wont. the fast I spin the dist. by hand ther isn't any and if there is then its weak(from the coil). do i change the distributor or the coil. it does it this with all the dist i have but their all used. i have one coil but its broken. it does this with either non vtec ecu or vtec.
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Old 09-04-2007, 01:34 PM
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Project:PULL Project:PULL is offline
Building H22 for Boost
Join Date: Sep 2006
Location: Houston, TX
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JDM DOHC F22B is a F22b block with an H23a1 Head. It has slightly less power and torque.
Search before you post.

Originally Posted by Preluderacer88 View Post
dude....a lude seriously wil out run a stock tt supra....easy...but i bet your one of those ppl that think supras are the fastest cars ever. always have been. and always will be dont you?
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Old 09-05-2007, 10:16 PM
remis remis is offline
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Location: Canada
Posts: 71

I had an just blew it today actualy...****ing oil pump when out and seized up the head...luckly i have a spare head...but yeah i go h22 if you really want to drive hard...h23s and f22s have shitty oil pump and are not good for long reving @ 6k and beyond...good for evryday driving in town and are realitvly cheap tho
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