hi, i've search on this forum and on others about this already, but what happens if you use stock cylinder sleeves with forged pistons? All the posts i've read just tell me not to do this, i'm wondering why. I have a H22a4 engine with FRM liners in the sleeves.
I'm in the process of going FI. I have the choices of either a thicker head gasket to lower compression or swap the pistons out for low compression ones, this is for reducing detonation.

Thanks for your help on this

 

You dont really need sleeves, but you are not going to be able to boost as high. At least put a block-guard if you gonna changes the pistons. Thease will help a bit.

 

Or you have the choice of running forged internals at the same compression ratio, getting a good fuel setup/standalone and proper tuning, and also making more efficient horsepower. You dont always have to drop the compression.

 

cant put a blockguard on an h22.

 

Your stock h22 sleeves arent' made out of metal, it's made out of nickel something. Basically the motor will never seal properly, if you use forged pistons.

Also stick to your stock compression.

You will made more power with your stock compression, then with lower compression and still be safe. People use to go lower compression on forced inductions cars becuase they ran HIGH boost. High boost meaning over 20psi. They did this because with higher boost and higher compression there is a smaller window for tuning. If your car is a street car stick to atleast 10:1.

 

Blockguard sucks!! Don't use it. And besides if you have a closed deck h22 you cant even put one on!

 

the h22a4 is not a strong motor to begin with for FI, the most I would boost on it stock would be 6-8pds if over that then something bad is going to eventually happen. build all your internals up if you plan on running 8+ pounds of b00st that way you will be safe.

 

can someone tell me whats the difference between closed-deck and open-deck engine ?? is b18c open-deck ?

 

Yeah...b18c..b18b...b16a..all open deck desings. Idont know if the h22a is closed deck..but when a motor is closed deck, that means there is no coolant chamber(water jacket) around the cylinders. Its is all aluminum.

 

well i do know about closed and open decks. Open decks are like 5th gen preludes, like mine, you can actually see the coolant jackets when you take the head off. 4th gen preludes are closed deck, meaning all you see if you take the head off is just the pistons in their cylinders, although you may see small opening around where the jackets are. If you get dartons sleeves, most likely you need an open deck, cause the sleeves are made in such a way that they seal off the deck. Supposedly open decks are weaker and more prone to shifting under high stress situations, whereas closed decks are more secure... hence getting blockguards for open decks.
most aftermarket sleeves i've seen, darton and GE reenforce the cylinders, the darton closes the tops, and the GE's have little legs that act like bockguards

 

so you're saying with stock cylinders and forged pistons the seal will never fit right? Oh man, i guess i'm stuck with my pistons then. Anyone else have any help they can offer?

 

1. You cannot use forged pistons in a stock sleeved H22 or H23. Cylindar walls will be chewed up. FRM and forged piston (do a search. This has bee disscussed to death in Prelude forum).

2. There are both open deck and closed deck H22 motors. Depends what year you get. I believe 96+ motors have open deck.

3. They do sell block guards for the H22 for about $100. Race Engineering carries them

4. Stock internal H22 will not hold high amounts of boost. Weak ring lands.



[Modified by Sushi X, 3:57 PM 10/17/2002]

 

Correction: #2. 93-96 H22A1 Closed Deck, 97-01 H22a4 Open Deck