humm...what motor is this and what are we goin for?....like 9's on boost and juice??

 

I'll be dropping in some 12:1 Weisco's in a couple weeks. Hopefully it runs fine. If anything goes wrong after running them I'll be sure to post.

 

Did you even read this thread?

 

LOL!....oh well, if it blows horrid smoke in like 2 weeks of runnin it, then we have our answer

 

Haha yea I did. Dont really matter to me if it blows. I'm just taking one for the team If it blows then I'll be out of a car for a couple more weeks.

 

The 92-96 blocks DO NOT HAVE IRON SLEEVES!. I even did the magnet test myself just to be sure.I stilll dont know where people get the nikasil stuff from,Other manufatures use nikasil,but honda doesnt use it on the prelude blocks,No where in there literature do they mention it.Its only the frm sleeves that are casted into the block,then honed out.And of course,running forged pistons in these blocks will present problems within time.Yes ,honda uses forged pistons,but they have an iron coating!If you get somefrom je or wiseco,they are not gonna send you them with an iron coating.If JE actually recommends that you don't run them with stock sleeves,then there must be a very good reason.

 

After reading this topic I have become very confused. In order to run forged pistons, I would have to have it bored out and sleeved with aftermarket sleeves? What confuses me is that I thought the rings where the only part that made contact with the cylinder liners. I dont seem to understand how the piston effect the walls. Is there some sort of friction with the frm sleeves and the forged pitsons? Can someone please help. I cant afford to rebuild agian for finacial reasons. Can someone explain exactly why they dont work and how it destroy's cylinder walls?

 

 

see this is where im confused also. Ive seen h22's with swain coated forged pistons. I've seen h22's with forged pistons in frm lined cylinders with swain treated rings. I thought people only resleeved the bores cuz the frm liner is so thin that anymore than a hone would destroy them...but i also understand the whole idea of iron coating forged pistons in the frm environment, such as the s2K and the NSX. I just don't understand why...H22's stock have cast aluminum pistons, that are coated with an anti friction coating(?), such as the stuff that swain tech offers...what would be the difference between nitriding or doing some similar treatment to forged pistons and running coated cast aluminum pistons like stock???

 

Guess no one has any real evidence or reasoning to why you can't run forged. Still confused as ever. I want to see some pictures of some blocks with messed up cylinder liners caused by forged pistons. Anyone who really believe this is true, can you give me some evidence.

 

Stock (cast aluminum) Prelude pistons are iron-coated as well.

Run a search or two over at www.preludeonline.com, probably in the forced induction forum. This has been covered plenty of times over there.

As far as I know, noone has attempted to coat aftermarket pistons in order to avoid resleeving. Assuming it works, you'd ideally use nikasil to reduce friction.

 

its just the fact that you cant have aluminum rubbing on aluminum...Yes,in most cases,the pistion should not touch the walls,cuz you should have a film of oil between the two.But,under heavy sudden acceleration,occasional pinging(knocking),And just driving it like it was stolen,there will be some contach.Im sure then if the pistons had a coating on them ,then the coating will make contach instead of the bare aluminum piston.Im sure the coating could be a ceramic type or iron base too.Another element that some forged and all cast pistons have is Silicon.Silicon is used to minimize heat expansion,increase the strenght of the aluminum and reduce friction.The prelude sleeves have silicon also.For the same reasons!So having two of the same aluminum alloys rubbing together will just create more heat and just begin to melt them together.i hope this clears things up for some people.

 

What color is the coating on the stock Cast Aluminum Pistons?

 

i c

 

I took a look at the stock cast pistons and I'm starting to understand it all. On the small upper section of the slug, above the rings, you can feel a sort of roughness. Under the rings, on the skirts, I can feel that there is some sort of coating making it very smooth. Also I see there there has been some contact with the skirts and the walls causeing wear on the skirt. I see now how a forged aluminum piston can do damage to a frm sleeve.

 

when i go home this weekend ill take pics of my cylinderwalls to show you the damage that competly stock pistons can do to the frm sleeves. im guessing i have around 75-90k miles on my motor and #1, #2 and #3 have significant scars in the walls that im not even sure if i can get them out going one size over.

 

i have gotten a response from an h22 builder that used forged pistons before he turbo'd his engine. he said it ran fine and nothing was wrong. also said that i shouldn't listen to what other people say and should only listen to the ones that have personal hands on experience with them. also, if the s2000 uses forged pistons from the factory..why can't the h22? lol. one of those questions that makes you wanna rip open an h22 block.

 

I've only known 1 person who has put forged pistons in a factory 2.2 block, he didn't have any problems even with lots of boost. I am not recommending it though, all this hype has to have started from somewhere and its not worth rebuilding your engine to have it crap out on you.

 

Damn i'm confused again now that your saying its ok to run them. Whos is this H22 builder you speak of? Need more info.

 

FACTORY HONDA FORGED PISTONS ARE COATED

thats why.... call up JE, or anyother piston manufactur and ask them..... they will tell you NOT to use their pistons w/o sleeving the block. i have seen coutless h22 block destroyed on preludeonline and hondaprelude.com b/c of this... its not worth the risk.....

 

Anyway you can post pictures of these blocks?

 

pay the 6 bux and do a search on http://www.preludeonline.com

 

so how about factory cast pistons? those that are run in h22's? they are iron coated as well??? that does not make sense to me; Why would honda coat a cheap cast piston to werk in an exotic block likke the h22, which is similar to NSX and S2K BUT they run forged iron coated slugs...

 

i couldnt tell you about the cast pistons.... gimme a few weeks and ill have mine apart and ill be able to tell you.

 

I already answered that question. Yes, the cast pistons are coated as well. And the benefits of an FRM sleeve are independent of whether you run a cast or forged piston. Better cooling, stronger, and less friction.

Does anyone actually read the information already posted here? The only thing that isn't answered here is why some "builders" feel that aluminum on FRM is okay. It is not.