Quote:
Originally Posted by Eaton PSI
There is always the chance that the clearances were all out of spec from new. Maybe subaru is a bit sloppy building them. Maybe that's why they're a bit more prone to failure than other engines.
Oil pressure at idle spec is about 7psi according to toyota, crazy low. With main clearances set at middle of spec, 0W-30 oil and a WRX pump I get 12-15psi at idle.
Who wants to buy a couple of new short blocks, strip, measure and post the data. I'm sure we'd all be very appreciative!  |
I was wondering if that main clearance was a cause of failures as well. Extra main clearance, means lower oil pressure for both the rod and main bearings. Then when someone gets rod knock it gets blamed on abuse or neglect.
I wish there was more data on what the main bearing shell bores should be. It seems like a pretty vital piece of info to leave out of the service manual.
Luckily this engine still had 20psi idle oil pressure with 0W-40, and down to maybe 16psi at worst idling immediately getting off the track and 240F oil temps.