Since we all know Honda made our blocks with fibre-reinforced matrix well in order to do an aftermarket piston it would need resleeving. Well thanks to a company called mahle changes all that. "They are race ready and easily be dropped into an H22 block, they available in flat top, high compression and inverted dome." -HT mag.
actually i just ordered a new engine build up set which includes mahle pistons, 8.5:1 compression. They said there will be a 2 week delay on shipping....maybe its because the new adjustments. By the way, Honda tuning, the magazine, in their may issue have a tech thingy on na tuning power. They took an integra i believe, correct me if i'm wrong, with an h22 swap and dropped mahle pistons and wut not. Built a crower head, strapped on a 3 inch exhaust piping system, ported out the stock intake manifold (the skunk2 wouldnt fit becuz the swap) and they made 220 wheel horsepower i believe.
FRM is a softer material, forged pistons cause scoring in the cylinder bores. There's probably a lot of weird chemistry involved with the different materials but forged pistons have been tried with the FRM liners before and it didn't work out very well!
220whp all motor is pretty impressive IMHO, that's 100whp per liter of displacement.. I can't imagine making much more power than that without adding displacement or forced induction.
__________________ Prelude Tribute Videos Ver 1 and Ver 2
yeah and tahts pretty close to wut the type r and m3 get per liter. From what i can remember, correct me if i'm wrong please, the type r gets like 109 per liter? and the m3 like 112? I vaugely remember someone mentioning that 2 me...
FRM is a softer material, forged pistons cause scoring in the cylinder bores. There's probably a lot of weird chemistry involved with the different materials but forged pistons have been tried with the FRM liners before and it didn't work out very well!
220whp all motor is pretty impressive IMHO, that's 100whp per liter of displacement.. I can't imagine making much more power than that without adding displacement or forced induction.
FRM is a softer material, forged pistons cause scoring in the cylinder bores. There's probably a lot of weird chemistry involved with the different materials but forged pistons have been tried with the FRM liners before and it didn't work out very well!
Doesn't the S2k have forged pistons? From what I've read, it's not the hardness of the material, but the fact that forged pistons are aluminum, and you must have dissimilar metals at the piston / cylinder wall interface.
Quote:
Originally Posted by NotoriouSH
220whp all motor is pretty impressive IMHO, that's 100whp per liter of displacement.. I can't imagine making much more power than that without adding displacement or forced induction.
Eh, Corey made 237 WHP on his H1 engine build using Honda pistons and rods, no sleeving, and IIRC, a nonmodified head, other than JUN cams and upgraded valve springs and retainers.
I'm making 204 WHP with stock cams, pistons, rods, and IM.
idk they seem to back porsche a well known company enough proof for me, many people have used em but they just came out so no one riden 50k miles in 2 years with em. i'm going to buy them when i get around to saving money well see...
__________________ 2001 electron blue h22a4 bb6 stock lude
FRM is a softer material, forged pistons cause scoring in the cylinder bores. There's probably a lot of weird chemistry involved with the different materials but forged pistons have been tried with the FRM liners before and it didn't work out very well!
220whp all motor is pretty impressive IMHO, that's 100whp per liter of displacement.. I can't imagine making much more power than that without adding displacement or forced induction.
The scoring has to do with the shape of the skirts and the additional thermal expansion a forged piston has. Generally, you run larger clearances with a forged piston, which causes the piston to rock when cold, which causes the skirts to come in contact with the cylinder walls.
The S2k and NSX 3.2L have forged pistons with FRM bores, and have no problems. The real key is to look at the metulurgy of OEM pistons for those engines, as well as skirt shape and factory clearances. The S2000 is probably the better engine to look at, seeing how it has (with the 2.2) similar stroke and bore to the H22. I've seen "spoon" s2k pistons, and they appeared to have some coating on the skirts- this may be important.
The S2k and NSX 3.2L have forged pistons with FRM bores, and have no problems. The real key is to look at the metulurgy of OEM pistons for those engines, as well as skirt shape and factory clearances.
Yup, high silicon content pistons, which limits expansion for tighter clearances. That, and they're also coated with iron . . . .
__________________
--- This message was not sent from a Blackberry PDA ---
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
2001 electron blue h22a4 bb6 stock lude 
Linear Mode
