First of all before I make myself look like an *** (if that isn't too late already), is there such thing as having forged pistons iron coated? If there is then would it be ok to use them in a FRM sleeve? (H22)

 

Some engine builders on here, Prospeed maybe? Clains they do some sort of coating that works.

What I'm saying is yeah I agree it's possible, but what type of iron coating are we talking about. It's not just iron....and will it crack? There's a reason Honda doesn't say much about FRM...trade secrets

 

um.......

why would you want to iron coat it? i've never heard of getting it done, so i don't know a good answer to your question.

do a search about re-sleeving etc in the Prelude forum. i remember someone mentioning something about coating the piston or something to use them in stock sleeves, but seriously, if you plan on more boost, it's only a matter of time before you actually fracture the stock sleeve itself.

 

I was just pretty much curious for the most part. I have the stock internals but I wqs thinking about going with a set of forged pistons. Then I learned about the forever debate about using forged pistons in a stock FRM sleeve. Then I heard that the resleeving jobs for prelude's suck, but I hear a lot of people here on h-t talk about how they've resleeved there engines and there doing fine. I don't know yet. What do you guys think? I'd like to go back up to 11lbs. on a dialy basis. (also:what compression o you recommend?)

 

I also have a thick inline pro head gasket (not sure as to how much lower that brings the compression to)

 

9:1 is a good CR. let me put it to you like this....If you're putting in forged pistons, why not just have someone like Golden Eagle Sleeve it. Piece of mind and a license to crank the boost.

 

click the link in my sig... there are some pretty good pics of my new Golden Eagle iron sleeve on my H22 in there

 

Here is a little 411 for the people that want it. Pistons of high-performance are 99% of the time made of aluminum. The lighter the piston, the higher your engine can rev as well as obtaining power. Back in the 70's your little idea was introduced. All alloy engines used iron-coated aluminum pistons, basically meaning your block could be linerless. However, its expensive. Go to http://www.dictionary.com if you dont know what expensive means. Iron-coating your pistons does not deliver the performance that nikasil treatment provides.

Nikasil treatment basically coats a layer of nickel-silicon carbide to the inner surface of aluminum cylinders. It will generate even less friction then cast iron sleeves and basically everything is enhanced. But guess what? Your engine uses a fiber reinforced metal cylinder sleeve.

The FRM process is as follows:
A fiber-based material in the form of cylinder sleeve is first inserted to the die of the block. Melted liquid aluminium is poured into the die and integrate with the fiber sleeve. Then the cylinder wall is machined to the desire bore dimension, leaving only 0.5 mm thickness to the fiber sleeve which covers the cylinder wall. It generates lower friction than iron liner, thus improves rev and power. Moreover, the fiber sleeve reinforces the block, allowing the distance between adjacent bores to be reduced yet maintain mechanical strength.

So whats my point? Your motor is only as strong as its weakest link. Stop trying to half-*** your set up, doesnt your sig say
?
We all know what im about to say next, so i wont.

Yea there are guys out there running stock block setups that produce high power and run 10s and 12s all day long, personally id rather spend $700 bucks and have a bullet proof block so i dont have to worry about re-building my motor again on down the line.


[Modified by GudeH23a, 11:36 PM 10/27/2002]

 

*click*

that was me just saving this one, that is THE BEST explaination i've heard yet.

 

True, I appreciate the input. Very informative. So after re-sleeving and putting the rods and forged pistons in how much boost will i be able to run. I'd lke to go back up to 11 on a daily basis. (it only lasted about three months the firs time.)

 

20+

 

Depends on your fuel system as well as fuel management. GE warantee's their blocks to withstand 40psi on a properly tuned set up

 

actually, they gaurantee 60... i thought it was the **** when i read the sheet that said the only way to void the warrante was to either jet wash the block or push over 60 psi

btw H22, i just added some more pics to my album, a lot more pics of the sleeves and the pistons if you wanna check em out.


[Modified by Boosted97Lude, 12:03 AM 10/28/2002]

 

This has been gone over many times. Nikasil and FRM have nothing to do with each other. We do not have nikasil coated sleeves and FRM is not needed on Nikasil coated sleeves.

Like you said, Nikasil is a coating/plating on the sleeve. It's used on many race motors and some stock motorcycle motors because of it's very low friction properties.

If you wanted to coat over the FRM with Nikasil, it might also be a valid approach to running forged pistons in stock sleeves. There are companies that do Nikasil cylinder plating, but it has been know to flake.