jt1 Posted March 29, 2005 Share Posted March 29, 2005 How long does a moderate performance motor last? After a recent track day, I was reflecting on the fact my motor just doesn't seem as crisp as it was. Still pulls pretty good, but not sharp. It was built with a fresh bore and pistons about 5 years ago. Probably saw about 5K street miles and 20 track events, then a year a half ago I freshened it up with new rings, speed pro plasma moly. Since then it has seen about 3K miles on track, and probably 2K street miles. It will use about a quart of oil on a typical track day, and has some blow by, just enough to see a little oil around the breathers. I had it apart about this time last year, but didn't put new rings in. Judging from the piston rock, PW clearance is 10 or 12 thou. Last night I ran a compression test and the results were not encouraging, 115-125 on all cylinders. Not good for a 10:1 motor. Dammit. I was hoping to get thru this season with the motor intact. What kind of life do you see from your builds? Mine's a first gen SBC, probably 400-450hp. John Quote Link to comment Share on other sites More sharing options...
Michael Posted March 30, 2005 Share Posted March 30, 2005 about 20 minutes, if the cam gets wiped. Quote Link to comment Share on other sites More sharing options...
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