Engine torn apart several pics Pics:) - Honda Prelude Forum

LudeTec · 02-25-2002, 07:27 PM

Hey,
I just thought I would post these for anyone interested. Pics of my engine torn apart

I am just getting a basic rebuild.

Josh

brendon2k · 02-25-2002, 09:40 PM

h22 or h23??

LudeTec · 02-25-2002, 10:15 PM

Hey,
Oh yeah...forgot to mention that

It is a JDM H22. I am just replacing the oil pump, and piston rings, and bearings. I wanted it to be strong enough to hold my turbo, till I can afford to build it properly.

Josh

NirVTEC · 02-25-2002, 10:23 PM

[QUOTE]Originally posted by LudeTec
[B]Hey,
I just thought I would post these for anyone interested. Pics of my engine torn apart

You suck, I unfortunately only have 3 pics of my head tear down. A nice pic of the block, intake ports, exhaust ports...I never got a pic of the combustion chamber/3 angle VJ...Damnit!!!

Damn those stock rods look weak...I can understand why people replace them. They look like pencils...Ever seen an Eagle Rod? 2-3 times that size(so what if you have to knotch the bottom of the cylinder)...

dflipmode · 02-25-2002, 10:46 PM

call me dumb or something...but dont you want a lower compression piston if you are going turbo....and i thought that the jdm h22 is not ideal for turbo since it has a high compression...unless of course, you are making that engine bulletproof to where it will be able to keep it from blowing up?...any info would be good...

NirVTEC · 02-25-2002, 11:57 PM

Quote:

Originally posted by dflipmode
call me dumb or something...but dont you want a lower compression piston if you are going turbo....and i thought that the jdm h22 is not ideal for turbo since it has a high compression...unless of course, you are making that engine bulletproof to where it will be able to keep it from blowing up?...any info would be good...

You're right...JDM has 10.6:1 compression...I would suggest a thicker head gasket for now(shaving heads is for Barbers) until you rebuild the bottom-end(8.5:1-9:1) to drop the compression a little(.25-.5) or you won't be able to run much boost safely. If you're going to run All-motor for any period of time before you install the turbo your car will be a tad sluggish, but when you go Turbo, it will have better chances of survival with a stock piston/rod assembly. Idealy you should hold off on the Turbo until you can rebuild the motor with forged rods/lower comp. pistons.

dflipmode · 02-26-2002, 07:10 AM

i thought that jdm h22 has a 11:0:1 compression...and the usdm h22 has the 10:6:1 cr...i may be wrong...but regardless it would be dumb to go all-motor first and then go turbo later because that means you basically have to rebuild the whole thing...it would be better to have a spare engine like a h23 that already has a low compression as it is....and just build that for the turbo and when you are ready..slap it on and take out the jdm h22...its pretty pointless to build the jdm h22 because you could just buy yourself an accord or a civic and use that for straight drag with the jdm h22...

93SRVMAN · 02-26-2002, 10:27 AM

usdm 5th gen and 4th gen VTEC: 10:1 comp.
JDM H22a: 10.6:1
Type -S: 11:1

NirVTEC · 02-26-2002, 11:04 AM

Quote:

Originally posted by dflipmode
i thought that jdm h22 has a 11:0:1 compression...and the usdm h22 has the 10:6:1 cr...i may be wrong...but regardless it would be dumb to go all-motor first and then go turbo later because that means you basically have to rebuild the whole thing...it would be better to have a spare engine like a h23 that already has a low compression as it is....and just build that for the turbo and when you are ready..slap it on and take out the jdm h22...its pretty pointless to build the jdm h22 because you could just buy yourself an accord or a civic and use that for straight drag with the jdm h22...

That would be the best idea....2 engines: h22 all motor....h23 turbo...

SLICK96 · 02-26-2002, 12:06 PM

Quote:

Originally posted by dflipmode
call me dumb or something...but dont you want a lower compression piston if you are going turbo....and i thought that the jdm h22 is not ideal for turbo since it has a high compression...unless of course, you are making that engine bulletproof to where it will be able to keep it from blowing up?...any info would be good...

In your opinion, or anybody else's, are stock H23 pistons low enough in compression for safe boosting around 10 psi (+ or - 2psi)??

93SRVMAN · 02-26-2002, 02:13 PM

I would say 10 MAX you should be fine. The typicall Honda engine should be able to handle 7-9 psi of boost without any side effects (given the ample fuel, etc..) H23's are 9.5:1 right? If so I would go for it.

cantdrive55 · 02-26-2002, 03:30 PM

Quote:

Originally posted by 93SRVMAN
I would say 10 MAX you should be fine. The typicall Honda engine should be able to handle 7-9 psi of boost without any side effects (given the ample fuel, etc..) H23's are 9.5:1 right? If so I would go for it.

H23 is 9.8:1.

dflipmode · 02-26-2002, 03:32 PM

yes with the proper tuning, it should handle 9psi max...i wouldnt take it higher than that...keyword...proper tuning..

SLICK96 · 02-26-2002, 03:37 PM

Well, I AM DEFINATELY going to replace my stock rods, and replace the main bearings, but I heard from a few people that I'd be fine leaving my stock pistons in ... perhaps just replace the piston rings and put a low comp head-gasket on. I'll be picking up the AEM EMS, so tuning will be handled, but I'm just worried about the stuff I'll have to upgrade in the valve-train and/or in the bottom end. Suggestions, besides rods, main bearings, piston rings, and low-comp head gasket?? Won't the gasket help enough to safely boost around 10psi?

Dr. James · 02-26-2002, 04:08 PM

You guys really need to understand that there is more to it than just "what can I boost with 10:1 compression". On my Prelude that I just sold I was running stock bottom end, ported head, a big 60-1 bb turbo, and 11 psi all day. It has to do with your tuning. I was running a Hondata fuel management system, and some 1100cc injectors. Upgraded pump, high flow filter, And your other basic items. I ran this with ZERO problems on 93 octane gas. I had a custom Fuel Map for running 13psi with a Mix of 80% 93 octane and 20% Tolulene. This really didn't net much more power, so I kept the Map for 11 psi running all the time. It's all in the tuning.

LudeTec · 02-26-2002, 06:35 PM

Hey,
It is exactly like Dr. James said. If you have adequate fuel(good tuning), you can run what ever comp you want. I know a guy running 13:1 comp on a b16, granted it is heavily tuned, and is NA, but he has 0 detination on PUMP gas. If I did rebuild my engine I would stay at 9.5:1 compression. I don't plan on running that much boost tho. I just want a little more power, I would probably be happy with a NA build up, but I have already bought my turbo kit(fmax), and Hondata 2b, and some other stuff. If I wanted to run mad boost I would just go buy myself a 240sx, or an RX-7, and be able to control it

Hey Dr. James, did you notice a big differance with your P&P? I could get PYR to do it for me while my head is off. They do geat work, and I am friends with them so he will do it for a good price. But I was wondering if my money would be better spent getting some other needed equipment?
Thanks,
Josh

SLICK96 · 02-27-2002, 02:00 PM

Quote:

Originally posted by Dr. James
You guys really need to understand that there is more to it than just "what can I boost with 10:1 compression". On my Prelude that I just sold I was running stock bottom end, ported head, a big 60-1 bb turbo, and 11 psi all day. It has to do with your tuning. I was running a Hondata fuel management system, and some 1100cc injectors. Upgraded pump, high flow filter, And your other basic items. I ran this with ZERO problems on 93 octane gas. I had a custom Fuel Map for running 13psi with a Mix of 80% 93 octane and 20% Tolulene. This really didn't net much more power, so I kept the Map for 11 psi running all the time. It's all in the tuning.

Thanks for the advice!! I'm just trying to gain more insight as to what I should do while the engine is apart, and the rods are going in ... what besides new piston rings, main bearings, & low-comp head gasket. I just want the engine to be strong at moderate levels of boost.

PreludeNYC · 02-27-2002, 03:44 PM

Quote:

Originally posted by LudeTec
Hey,
Oh yeah...forgot to mention that It is a JDM H22. I am just replacing the oil pump, and piston rings, and bearings. I wanted it to be strong enough to hold my turbo, till I can afford to build it properly.
Josh

how much to replace an oile pump, I got a JDM H22 also, i was thinking about putting in new gaskets all around and changing the oil pump... Before I put everything back together again!

-Jose

LudeTec · 02-27-2002, 05:31 PM

Hey,
Oil pump is 150 from hondaautomotiveparts.com. Then how ever much labor is. If the engine is out it is an easy task to change, and worth while. My JDM h22 had bad oil pressure, and I had no vtec

As for a strong engine one thing I would recommend is getting your oil pump replaced, and shimmed, or just shimmed if you pump is ok. Prelude oil pumps are weak and have a tendency to go out when running FI

Josh

SLICK96 · 03-06-2002, 02:35 PM

Damn ... 1 more thing to buy. ARGH!