Originally Posted by AustenW

Both my friends had never had a problem either until they started reaching over the 700bhp mark

Both of them have had 2 failures in the last year with the casings and gears shattering

One is a rover engine and the other an Audi engine

The Zetec oil pumps are renowned in the single seater series for shattering over 7800 rpm with continued abuse and all of them use a dry sump as standard in there 150bhp cars

Aparently in the Zetecs its due to harmonics of the engine at this RPM

Some people fit billet gears into the zetec but really its like a polishing a turd if you know what i mean