m_0ney_pit
15+ Year Contributor
- 780
- 57
- Jan 12, 2007
-
Easton,
Pennsylvania
So I tore down my built engine to figure out why it was using so much oil.
Setup is a 6 bolt with eagle/wiseco 8.3:1 85.5mm .Motor used bout a quart every 3k miles when fresh built on Mobil 1 50 weight oil. No smoking at idle or under boost.
Fast forward 40k miles later its using a quart every 500 miles, time to take it apart.
Specs when I built it I had set ptw to 3.5, top ring 17, bottom ring 19 thousands and oil ring left ungapped. I measured these myself at time of build.
Compression after breaking it in was 155 on each cylinder. Compression before tear down was 150 on each cylinder.
Ptw is still 3.5 , not a single vertical line in the bores hone lines still visible but bores have thick coating of fresh oil. Top ring is now 28, bottom 32(one was 60) and oil rings have 30 thousands. So to me clearly the rings are shot but is this common of wiseco rings?
The one variable I don't know is what grit my machinist used to hone the cylinders.
Setup is a 6 bolt with eagle/wiseco 8.3:1 85.5mm .Motor used bout a quart every 3k miles when fresh built on Mobil 1 50 weight oil. No smoking at idle or under boost.
Fast forward 40k miles later its using a quart every 500 miles, time to take it apart.
Specs when I built it I had set ptw to 3.5, top ring 17, bottom ring 19 thousands and oil ring left ungapped. I measured these myself at time of build.
Compression after breaking it in was 155 on each cylinder. Compression before tear down was 150 on each cylinder.
Ptw is still 3.5 , not a single vertical line in the bores hone lines still visible but bores have thick coating of fresh oil. Top ring is now 28, bottom 32(one was 60) and oil rings have 30 thousands. So to me clearly the rings are shot but is this common of wiseco rings?
The one variable I don't know is what grit my machinist used to hone the cylinders.