I reached out to Racers Edge regarding Wossner Pistons.
The issue was resolved. Wossner is no longer using the coating that was the issue. For specific details on that contact Karl at Racers Edge.
Alusil Pistons are now PC-9 coated for Alusil.
Wossner also lists 2 different part numbers for 944 turbos.
The screenshot is from a Wossner Piston catalogue for reference not Racers Edge.
One part number for Alusil blocks
A second part number for non Alusil blocks
I would recommend that anyone in the US to reach out to Karl at Racers Edge if buying Wossner.
Racers Edge deal with 944 stuff as many on here are probably familiar.
Something went wrong the first time when I uploaded the screenshot that’s why there are two
.
Alusil Pistons
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Tom
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Worth noting that Swain's own website says PC-9 works well with nickasil, chrome or iron cylinder bores, but Alusil is conspicuously missing from that list. I've read anecdotal reports saying pc-9 works in the 944, along with plenty of seller claims, but I'm not sure how much real world validation we really have?
https://swaintech.com/race-coatings/rac ... on-skirts/
Some readings on the iron-based Mahle piston coatings...
https://docs.lnengineering.com/article/ ... n-coatings
https://swaintech.com/race-coatings/rac ... on-skirts/
Some readings on the iron-based Mahle piston coatings...
https://docs.lnengineering.com/article/ ... n-coatings
Hmmm
Wish Mahle would make a 100mm
Not going to re-hone a brand new Porsche block with Perfect cylinder walls
About to call the Porsche dealership for a price on stock pistons….oh joy for price :/
Wish Mahle would make a 100mm
Not going to re-hone a brand new Porsche block with Perfect cylinder walls
About to call the Porsche dealership for a price on stock pistons….oh joy for price :/
Tom wrote: Tue Jul 07, 2026 9:55 am Worth noting that Swain's own website says PC-9 works well with nickasil, chrome or iron cylinder bores, but Alusil is conspicuously missing from that list. I've read anecdotal reports saying pc-9 works in the 944, along with plenty of seller claims, but I'm not sure how much real world validation we really have?
https://swaintech.com/race-coatings/rac ... on-skirts/
Some readings on the iron-based Mahle piston coatings...
https://docs.lnengineering.com/article/ ... n-coatings
-
Tom
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I've never don't it, but it's my understanding that Mahle Motorsport will make pistons to customers' specs...gruhsy wrote: Tue Jul 07, 2026 2:12 pm Hmmm
Wish Mahle would make a 100mm
Not going to re-hone a brand new Porsche block with Perfect cylinder walls
About to call the Porsche dealership for a price on stock pistons….oh joy for price :/
Tom wrote: Tue Jul 07, 2026 9:55 am Worth noting that Swain's own website says PC-9 works well with nickasil, chrome or iron cylinder bores, but Alusil is conspicuously missing from that list. I've read anecdotal reports saying pc-9 works in the 944, along with plenty of seller claims, but I'm not sure how much real world validation we really have?
https://swaintech.com/race-coatings/rac ... on-skirts/
Some readings on the iron-based Mahle piston coatings...
https://docs.lnengineering.com/article/ ... n-coatings
https://www.us.mahle.com/en/motorsports ... ston-sets/
Someone on the PCGB forum used Mahle Motorsport pistons for their Alusil rebuild within the last couple of years I think. I'll admit I was sceptical and posted that, but it seems it's all good. So showed how much I knew.Tom wrote: Tue Jul 07, 2026 9:55 am
I've never don't it, but it's my understanding that Mahle Motorsport will make pistons to customers' specs...
https://www.us.mahle.com/en/motorsports ... ston-sets/
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Latitude48
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Sunset lists 951-103-091-71, which is 100.5 Group 2 for $427.86, but that doesn't do you any good.gruhsy wrote: Tue Jul 07, 2026 2:17 pm And Porsche dealer says no longer available in any size.
There you have it
Aftermarket it is.
Tom Pultz
- 1989 944 Turbo - Guards Red/Linen
- 1990 944 S2 - Guards Red/Black
- 2003 Audi 1.8TQ - Denim Blue/Black
- 2003 Honda Civic Si - Vivid Blue/Black
- 2023 VW Golf R Base - Lapiz Blue/Titan Black
- 1989 944 Turbo - Guards Red/Linen
- 1990 944 S2 - Guards Red/Black
- 2003 Audi 1.8TQ - Denim Blue/Black
- 2003 Honda Civic Si - Vivid Blue/Black
- 2023 VW Golf R Base - Lapiz Blue/Titan Black
I've got Mahle Motorsport pistons in my alusil build, no problems so far. Not the cheapest option thoughblade7 wrote: Tue Jul 07, 2026 4:16 pmSomeone on the PCGB forum used Mahle Motorsport pistons for their Alusil rebuild within the last couple of years I think. I'll admit I was sceptical and posted that, but it seems it's all good. So showed how much I knew.Tom wrote: Tue Jul 07, 2026 9:55 am
I've never don't it, but it's my understanding that Mahle Motorsport will make pistons to customers' specs...
https://www.us.mahle.com/en/motorsports ... ston-sets/
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Tom
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Did you custom order them?Bergerac wrote: Tue Jul 07, 2026 7:50 pmI've got Mahle Motorsport pistons in my alusil build, no problems so far. Not the cheapest option thoughblade7 wrote: Tue Jul 07, 2026 4:16 pmSomeone on the PCGB forum used Mahle Motorsport pistons for their Alusil rebuild within the last couple of years I think. I'll admit I was sceptical and posted that, but it seems it's all good. So showed how much I knew.Tom wrote: Tue Jul 07, 2026 9:55 am
I've never don't it, but it's my understanding that Mahle Motorsport will make pistons to customers' specs...
https://www.us.mahle.com/en/motorsports ... ston-sets/
Any chance you have paperwork for them you could share with us?
Would potentially make it a bit easier when I contact Mahle and if other people follow that route.
Thanks
Would potentially make it a bit easier when I contact Mahle and if other people follow that route.
Thanks
Bergerac wrote: Tue Jul 07, 2026 7:50 pmI've got Mahle Motorsport pistons in my alusil build, no problems so far. Not the cheapest option thoughblade7 wrote: Tue Jul 07, 2026 4:16 pmSomeone on the PCGB forum used Mahle Motorsport pistons for their Alusil rebuild within the last couple of years I think. I'll admit I was sceptical and posted that, but it seems it's all good. So showed how much I knew.Tom wrote: Tue Jul 07, 2026 9:55 am
I've never don't it, but it's my understanding that Mahle Motorsport will make pistons to customers' specs...
https://www.us.mahle.com/en/motorsports ... ston-sets/