RS2 Intercooler "O" Ring Size ???

[ian4455]

What size is the "O" Ring that seals the RS2 Intercooler to cross member Pipe ??

[re2500]

Your much better off using a cut down silicone hose reducer 60mm-40mm if my memory serves me correctly. Do a search for "Mark H Mod" on the forum.
The O rings are known for leaking. The hose is a much better solution.

HTH

[Rusty]

it's a 70mm - 60mm reducer.

The O ring will be available through Audi, suggest you give s2avant a shout. Worth having something in the O ring spot to stop the IC and XM hitting each other.

[re2500]

Yes its a 60-70mm i remember now! lol.

I wouldnt use it without the oring as Andy said. just so that the intercooler and crossmember locate together nicely.

[terrybullwon]

A o-ring if sourced correctly will be better than a silicone reducer.

Don't forget Wiggins fittings used on air crafts and other high end applications use a o-ring to seal and these are rated to something stupid like 1000psi.

And are approved to carry fuel as well as air and water.

[Rusty]

The problem with the O ring is making sure that it's seated perfectly, not always possible if the car has been apart a few times and some damage has resulted, if you can get it all together with lots of lube then it will hold but best to use both systems, the O ring and the reducer, I did this 5 years ago and it's been perfect ever since, much better than the mess that existed before!

http://www.s2forum.com/forum/showthread.php?t=5213&highlight=ring

[ian4455]

I was going to use both methods incase the "O" ring leaked.

[Rusty]

Job done

[saltinot]

The o-ring for the intercooler is the exact same part number as the thermostat housing o-ring. Your friendly neighborhood parts store should be able to source it for you also.

[Rusty]

Good info

[Lupo911]

OEM is 60x1.5, there are 60x2.0 or 60x2.5 available aswell

[Jonas_R]

Carsten something is not right with the 1.5mm thickness of the o-ring, because the one you get from audi is 3,5 mm in thickness and ETKA list the same size as well.

I got a some from work in 1.5, 2 and 2.5 mm and I would say that they are to small in thickness to fit in the o-ring groove.

I mean a 3.5mm o-ring will have a groove that is somthing like 4,55mm in width and the depth is like 2,8mm so a 1.5mm o-ring will have little or no effect in my opinion.