93saver

Ok im new to the Honda crowd. So heres my question. Im trying to save a 93 si from the yard. It has a H23a1 motor in that the head is scrap. Im told a F22b engine is a direct replacment for this engine with no modifications being made. Both engines are non Vtec.Is this true ? or what do i have to do to use the F22B motor since they are a lot easier to get. Thanks in advance.

 

petern101

1. you need to learn how to search

2. both engines are non vtec but its not a direct drop in. you will actually lose power by putting it in.

3. i know you would have to change the ecu but it would be a direct drop in. most ppl would opt to put either the same or better unless they want to turbo their f22.

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a94si

Is he asking about the sohc f22, or the jdm dohc f22b? The Jdm dohc f22b is a drop in. I believe the only thing it doesn't have is the knock sensor. It's got the same hp as a h23, just a little less torque. I think it's a good alternative if you want to stay non-vtec. You can get a jdm dohc f22b with low mileage for around $500-600. It seems like you can't find a low mileage h23 anywhere.

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94 Honda Prelude Si

JUNprelude

That is true. If it is the JDM DOHC engine, then it will be a direct drop in. And yes it does not have a knock sensor. So you will get the check engine light. I blew my 93 si, and couldn't find a H23A1 so, my uncle got me the JDM version. Same hp, but less torque.

93saver

Thanks gents .And your right about a direct swap. I can use the same ECU. But would have to wire up the knock sensor. Same horsepower just a little torque.That using the F22B motor. Thanks for the help.

JUNprelude

that was the only thing i needed to do to get rid of that darn check engine light. Do some thorough research if you can on the knock sensor, and good wiring practices. Since I was lazy not to wired it correctly (after engine installation) I just had to deal with the check engine light. The H23A1 ecu will not have a problem, with this motor. You will notice a shorter range in rev and if you redline it, you can hear from the sound of your exhaust when it cuts fuel off and bounces back to lower rpm. sounds great. i did it too much, just because i liked the damn sound it made.

pyro_maniac55

if you are looking for minimal work and money thats the way to go, but if you are looking for fun go with the h22a, vtec!! much more fun

DJW333

Well, after lots of web browsing I decided to do a swap too!

I have a 1992 Prelude Si w/ USDM H23A1 non-Vtec

I bought and installed a JDM H23A non-Vtec

Minor conversions

Everything went together very well.

It will not start and I have gone over everything from spark to fuel.

I am curious if the Injectors may be different from the USDM version?
Not much web info on this. Anyone put this together before?

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km23

I am thinking about doing a swap like yours. I don't know about the different injectors. But i would start from the bottom and work your way up, through all the minor things that might not let the car start. Good luck

JUNprelude

The injectors were not a problem with the installation on my 93 si. like he said above, just work your way from the bottom-up. It can be something real minor. As simple as wiring, the order of your spark plug wires and or fuses. And yes, an H22A motor is super fun. I was able to buy one last year! From 93 si (totaled) to a 95 si vtec (running) I love the fourth gen prelude.

DJW333

It wants to start........I know it! I smell gas after a few attempts. I checked the voltage at each spark plug wire and the spark plugs are soaked in fuel. I was trying to hunt down any specific differences that I may have missed.......eg. ECU? Injectors?

km23

[quote=JUNprelude;2830508] It can be something real minor. As simple as wiring, the order of your spark plug wires and or fuses. QUOTE]

Like said it could be even a fuses. If your plugs are soaked in fuel then i would assume it would be a electrical problem. Check the distrubtor cap, and you coil for voltage.

DJW333

Oh yeah! I checked the fuses and connections.......Has anyone ever completed a JDM H23A install? I was curious if anyone knows this swap? It will start.......The problem will present it's self sooner or later!

Thanks

NAWLINS93LUDE

the JDM h23 is a Vtec motor its a 200whp version.. it was in the accord waggon.. It has a blue top and yes i know a few people who have done it.. the USDM h23A1 non vtec the h23A from JDM IS VTEC

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If only preludes were rear wheel drive

NAWLINS93LUDE

U sure that motor you got didnt have a HEADSWAP?? i only seen one motor with a h23A stamp on it like that but without vtec, and it had a headswap.. Im thinking you have F22B head on the JDM h23A block... cuz thats what the other 1 i seen was.. damn frankenstein motors confusing me..

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If only preludes were rear wheel drive