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Old Jan 19th, 2014, 07:09 PM
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Mahle or CPS forged pistons?

Im thinking of making an upgrade to my R56S wngine with forged pistons. Seems that the piston rings are in bad shape (consuming too much oil) so i probably have to open the engine and replace them, but once i do so why not put forged pistons in there. Friends have advised me for those two brands, Mahle and CPS but i have no idea which of the two is best! Any help on this and where from can i get them as cheap as possible?
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Old Jan 22nd, 2014, 10:36 AM
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Have you had the diagnosis done by someone you can rely on? Not heard of this on the R56, its usually the turbo seals, or the breather system.

What's the compression like compared to what it should be? Have you had a look inside the cylinders with a boroscope?

Tab

Quote: Originally Posted by genik (original)
Im thinking of making an upgrade to my R56S wngine with forged pistons. Seems that the piston rings are in bad shape (consuming too much oil) so i probably have to open the engine and replace them, but once i do so why not put forged pistons in there. Friends have advised me for those two brands, Mahle and CPS but i have no idea which of the two is best! Any help on this and where from can i get them as cheap as possible?

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Old Jan 22nd, 2014, 10:32 PM
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Quote: Originally Posted by Tabintab (original)
Have you had the diagnosis done by someone you can rely on? Not heard of this on the R56, its usually the turbo seals, or the breather system.

Where is the turbo seals and breather system located?

Quote: Originally Posted by Tabintab (original)
What's the compression like compared to what it should be? Have you had a look inside the cylinders with a boroscope?

Yes the technician had a look with his camera and on the pistons heads he saw carbon along with burned and fresh oil stains!
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