Paulyy

If i replace my pistons and rods with aftermarket.

Currently looking at Mahle pistons & Pauter rods. Can i re use the rod bearings and piston rings?

I know the pistons come with rings, bearings are cheap. But both in mine are quite new. So just asking really. I dont have an issue swapping them.

rlm328

For the rings, check there gaps and make sure they go back in the same cylinder they came out of. The only issue I would have are they the same thickness as the new rings. I would swap the bearings just because they are the things that fail.

JET951

Are you thinking Mahle factory pistons Pauly? or Mahle motorsport pistons? Any reason for the change? you can always reuse the rod bearings if you wish, i would use flexigauge to see if you have the correct clearance. As for the rings, if the pistons are not factory they will probably need new rings as the later manufactured pistons from Mahle motorsport use a thinner ring.
Now if you do get new pistons they usually come with rings to suit (you have to file them to fit). My preference is Wossner.
Regards
Sean

Paulyy

I was thinking that with the rings.

Thanks Sean,
Mahle motorsports pistons. But i have noticed they're 100.5mm not 100.0mm I'm not sure if that's an issue.
I did look at Wossner. My first choice. I was just reading threads and a lot of people had mentioned Mahle motorsports.
I know new new pistons come with rings, Gapping them is easy.
Preference with Rods? Years ago i looked at wossner rods, but a few have told me they're about 500hp capable. Which is to close to my power output. Pauter seem popular.
Are you a supplier of any?

Also with the pistons, I'm going to cut valve reliefs in them. So i was looking at getting 20cc pistons. I need to work out how much it'll take out from the piston too.
And at the same time i'm going to CC my head and see exactly what my compression ratio is. I feel like my old head was higher CR than my new head.

Paulyy

Im looking at these ones listed on ebay.

http://www.ebay.com.au/itm/MAHLE-Pis...MAAOSwzJ5XWIr0

volume is 21cc vs 26cc normal i believe.

If i can get the same with wossner, i'd get them.

944crazy

100.5mm would require an overbore?

Paulyy

I dont know. I would believe so. I cannot find 100.0mm mahle motorsport size pistons. If that's the case, I don't plan on it.

Or i need to find a supplier of 20cc wossner pistons, that are not priced $500 more than they should be.

Voith

100.5 definitely needs an overbore, also check last few pages of 3.0 registry thread. I would steer clear of new mahle alusil coating.

Paulyy

I dont plan on an overbore. and ouch. i just had a look. I don't float around in that thread. I'll guess i'll stay away and use find a set of 100mm wossner with 20cc bowls.
I know Lindsey Racing have them, but at their $1200 price for any version is way to expensive vs racers edge at 650.

blade7

Isn't the $1200 for custom pistons ? I think the standard Wossners are available from plenty of vendors.

Paulyy

I am not sure as all of their wossner pistons are $1200.

blade7

I think 100 and 100.5mm Wossners are around £600 here, easy to order too. I'm fairly sure the Wossners run more clearance than the original Porsche pistons, so I don't think you can fit like for like without some block work.

Paulyy

I have emailed Racers Edge to see if they can get the 20cc bowls. They sell them for $650usd but that's just the 25cc ones.

blade7

Are 100mm Wossners smaller than standard pistons to take account of the extra clearance required ?

Paulyy

I believe wossner pistons are compatible and have been mentioned many times around the forum.