donistook

We contracted with JE to develop an 81.5MM piston for the S4 and have just received our shipment. We have seen S4 engines with scored cylinder walls that needed to be overbored and with bad pistons. Audi does not market oversize pistons, so you would either have to trash the block, or bore/sleeve/ and bore back to standard...and then buy new stock pistons...certainly possible, but not desireable. We will be testing these pistons in an engine very soon. There are a couple of nice advantages to these pistons over the stock Mahles.

This makes the engine a 2.75L. There should be no cooling issues with the slight displacement increase.

Don Istook

Big

Any idea on approximate cost for the end user?

dscottjr

Can you talk about the design advantages?

dscottjr

that's probably a question better asked via email so this thread doesn't get baleeted.

VonK :: Retired

Got pictures?

Imolavirus@BuehnEngineering

sounds awesome........what pistons did bollocks use?

s4nit loves BOX

I had some serious piston slap in my old block using JE pistons until the motor warmed up and I know a bunch of other people running JE's that has the slap until the car warms up.

How much clearance are you going to run with those to allow for expansion when the motor heats up?

JBear::FATS

He has a 2.7 from what I understand ..

Pat-SoCal

Difference in grams from stock units?

donistook

10 grams difference