Piston Damage
Thread Starter
Le Mans Master
Joined: Feb 2005
Posts: 6,475
Likes: 564
From: Clearwater Florida
..... Not too quick , I ran a 6.80 on the eighth ... this setup usually runs 6.76's ... my front brakes have been dragging a bit (now I have time to rebuild the calipers) and I thought that might have been what slowed me down ... anyway , the block cleaned up @ .0015 ... time for some custom pistons ... 
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Thread Starter
Le Mans Master
Joined: Feb 2005
Posts: 6,475
Likes: 564
From: Clearwater Florida
..... Still scratchin' our heads ... the datalogger showed the AFR on that bank @ 12.5 through the pass from 4500rpm up ..... and the spark was 2 degrees lower than I usually run ... I'm starting to think it was too fat .....
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... Nice ! .....
Thread Starter
Le Mans Master
Joined: Feb 2005
Posts: 6,475
Likes: 564
From: Clearwater Florida
..... Nothing extraneous here ! Foreign objects leave witness marks in the piston crown and the cylinder head ... this was a torch job ... arson , I tell you ! ... You can see how it melted through the oil ring and the oil ring support rail , not to mention the aluminum piston .....
Race Director
Joined: Oct 2008
Posts: 17,982
Likes: 1,072
From: Lansing MI
..... Nothing extraneous here ! Foreign objects leave witness marks in the piston crown and the cylinder head ... this was a torch job ... arson , I tell you ! ... You can see how it melted through the oil ring and the oil ring support rail , not to mention the aluminum piston .....
Safety Car
Joined: Sep 2001
Posts: 4,137
Likes: 531
From: Glenbeulah Wi
Definately detonated, I assume this car if fuel injected, I would look for a problem with that cylinders fuel injector. (Did the WB monitor a lean condition and add fuel to the other three cylinders while this one was still lean)? Was your water pump working on the run, (Hot spot like a steam pocket)?
Thread Starter
Le Mans Master
Joined: Feb 2005
Posts: 6,475
Likes: 564
From: Clearwater Florida
..... Hey Jamal ! ... The car launched normal ... 1.47 60' , had a little air under the fronts , but by half track I knew it was losing power and when I got off the pedal it smoked like 2 or 3 people vaping ... everyone was surprised that I drove it back to the pits ... the safety crew expected to see a couple of rods hanging out of the block ... by the time I put it on the trailer , it was wheezing oil and fumes out of both valve cover breathers ... thankfully , it started up when I got home so I could put it in the garage ... Gotta get it back together , this is our racing season ... the tracks shut down in July and August because of the weather ! .....
Race Director
Joined: Oct 2008
Posts: 17,982
Likes: 1,072
From: Lansing MI
Definately detonated, I assume this car if fuel injected, I would look for a problem with that cylinders fuel injector. (Did the WB monitor a lean condition and add fuel to the other three cylinders while this one was still lean)? Was your water pump working on the run, (Hot spot like a steam pocket)?
Last edited by PatternDayTrader; Feb 4, 2018 at 08:22 PM.