Piston failure !
Thread Starter
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Piston failure !
Any ideas on why this(picture below)happened at 5500 ? Other pistons show no sign of detonation.Car drove into shop,initial timing was 12 with a total of 28.Nothing missing from inside of carb(throttle plates,screws or well plugs).In other words could not find anything that found its way into cylinder.Pistons are Keith Black---manufactures defect? Top ring end clearance was .026. Thanks[IMG]mike piston 001[/IMG]
Drifting
Joined: Aug 2005
Posts: 1,289
Likes: 3
From: East Waterboro Maine
Sounds like a broken ring land. Was the ring end gap set properly? I would have that checked out, it may be a problem in the other cylinders as well.
How do the cylinder walls look? Heads/Valves?
How do the cylinder walls look? Heads/Valves?
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Sounds like Msvetteman's problem. There is no way I would use hyper pistons on anything! I know there are some here that swear by them but my engine builder also says they are junk. The issue is to little clearance between the ringland and piston top and brittle metal, they break. He has built engines in a 1 man shop for 25 years and builds for circle track guys and lots of truck pullers. He is also rated as the best around by everyone in the area. The truck pull engines are Big Block Chevys and most are over 700 HP strokers and he won't use the hyper pistons.
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Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I am using Mahle power pac forged on mine. They are a low expansion high silicon alloy. Best of both worlds, No additional clearances required ( .003) and forged for the strength you want. $500 with rings on E-bay!
