Anyone used these or know someone who has? Their pistons that can be run in the h22 without sleeving the block. Are there any other companies that offer that too? Anyways I'm just looking if ppl think these are any good for for street use and FI considering they are aliminum?

 

no actually i have never heard of them but i seriously doubt these pistons will work on an h22 without sleeving it. if they claim you can do that and run fi i probably wouldn't buy them.

 

yes. these guys are awesome. they build mostly european pistons (BMW, Porsche, MBZ, etc.). super high quality. i was actually thinking about a set of these. they only come in 11.5:1 and one other CR though. BUT you can custom order them in any ratio.

 

If these are the same metal used in the a/c VW pistons, they are good cheap pistons, but they are not truly forged. They are made by a casting process that produces a "forged-like" piston that is stronger than normal, but not as strong as a true forged piston.

They could be using a different metal though

 

It's in this month's Dsport. p29
"...while the Goldseries kits get an application of the all together different "GOLD" coating allowing them to be run in a FRM(fiber reinforced matrix) bore such as in the Honda H22 Without having to sleeve the block."

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EM2Civic &raquo;</TD></TR><TR><TD CLASS="quote">It's in this month's Dsport. p29
"...while the Goldseries kits get an application of the all together different "GOLD" coating allowing them to be run in a FRM(fiber reinforced matrix) bore such as in the Honda H22 Without having to sleeve the block." </TD></TR></TABLE>

you got a link to that?

 

There was nothing on their actual website, but in their online PDF catalog this was listed:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">
Honda H22

• Forged from 4032 high silicone low expansion aluminum
alloy for high strength and reduced piston to wall clearance
• Radiused valve pockets
• Forced pin oiling
• Precision pin fitting and easy to use round wire locks included
• .866" high quality steel wrist pin (105 grams) included
• Precision ring grooves for INCLUDED 1.2, 1.2, 2.8mm rings
Rod Pin Comp. Dome Weight Comp.
Bore Stroke Length Dia. Height Volume Grams Ratio Part Number
87.00/3.425 3.571 5.630 0.866 1.220 -7cc 328 9.0 HON220425I07
87.50/3.445 3.571 5.630 0.866 1.220 -7cc 331 9.0 HON220445I07
87.00/3.425 3.571 5.630 0.866 1.220 -1cc 319 10.0 HON220425F01
87.50/3.445 3.571 5.630 0.866 1.220 -1cc 322 10.0 HON220445F01
87.00/3.425 3.571 5.630 0.866 1.220 10cc 342 11.5 HON220425D10
87.50/3.445 3.571 5.630 0.866 1.220 10cc 348 11.5 HON220445D10</TD></TR></TABLE>

 

Sorry no link it's in this month D-Sport Magazine on the page i said. It January 2005 edition on p29. I'll email them about it.

 

This is the second info of a FRM compatible Mahle product I noticed. And I still don't know whether it's true.
One Canadian guy bought forged Mahle pistons for H22 and later on contacted Mahle and they told him he had bought pistons meant for sleeved block and they could replace them for those which work with FRM...
It's really interesting.

 

The "Gold" coated skirts sounds just like Wiseco's friction-coated pistons, which have not worked in the past w/ FRM.

I'm very interested in seeing what is up w/ these pistons.

 

I sent them an email i'm waiting on their response.

 

My work uses Mahle products all the time but that is for vw and audi's. I would say that quality is definintly there but I would still question that they can be used with FRM.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prylwd &raquo;</TD></TR><TR><TD CLASS="quote">...I would still question that they can be used with FRM.</TD></TR></TABLE>

That's why we are still waiting for a response from Mahle...

 

I just saw a huge add in this months honda tuning about the h22 specific pistons but they still haven't replied my email. But it said in the add that they are good for FI as well hummm.

 

Any updates?

 

They appeared on ebay now.
<U>New Mahle pistons </U>

 

They work, thats all Im going to say though.

There are a few people on this board that have been testing them with success.

The quality of Mahle pistons isnt that great though, tolerances arent great, ring groves arent great, they are heavy and in some cases not properly mahcined in the finishing process.

There are better options on their way out for FRM blocks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H2X &raquo;</TD></TR><TR><TD CLASS="quote">
There are better options on their way out for FRM blocks </TD></TR></TABLE>

Which options? Wiseco didn't prove itself right in FRM so far.

 

there is a guy on this forum that months ago was over 20000 miles boosting on wiseco pistons and stock sleeves its in that big *** thread. he was running 15psi on i believe a t3/t4e

but i'd wait since rick would know more then us on whats on the horizon

 

yeah and after all he showed a nice H22 block with scored cylinder walls... thanks

 

The first mistake made when trying to use Wiseco pistons in a FRM block is assuming that a coating will prevent a 2618 alloy piston from expanding.

The only alloy that can be used with FRM is a low expansion, high silicon content alloy such as 4032 or even VMS-75.

Those alloys are a little softer than 2618 and dont expand as much under heat.

That coupled with a nice anti friction coating will work wonders in a FRM block, the hard part is finding the right coating

Its not as easy as most would think

 

I can vouch for Mahle Motorsport pistons. My dad has been running them for over two years at high boost and the have held up perfectly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H2X &raquo;</TD></TR><TR><TD CLASS="quote">The quality of Mahle pistons isnt that great though, tolerances arent great, ring groves arent great, they are heavy and in some cases not properly mahcined in the finishing process.
</TD></TR></TABLE>


thats what i have heard also:

https://honda-tech.com/zerothread?id=991635

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by max8455 &raquo;</TD></TR><TR><TD CLASS="quote">I can vouch for Mahle Motorsport pistons. My dad has been running them for over two years at high boost and the have held up perfectly.</TD></TR></TABLE>

in what

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pentaq &raquo;</TD></TR><TR><TD CLASS="quote">yeah and after all he showed a nice H22 block with scored cylinder walls... thanks </TD></TR></TABLE>

.... ummm we talking about the same guy? his **** still runs so im confused.. i remember seeing a couple people in that long thread that had wrong tolerances for the pistons and thats why the're **** got screwed. His motor was still running fine as of 2 months ago. H2x knows more though, so i'd use whatever he recomends