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Piston Damage

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Old 02-03-2018, 09:10 AM
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C409
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Default Piston Damage

..... Did a compression ratio adjustment at the track ... gonna head out to Walmart to pick up some JB Weld .....



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Old 02-03-2018, 09:13 AM
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PatternDayTrader
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Lol ..
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Old 02-03-2018, 09:39 AM
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You got variable compression on that thing? That is quite the nice radius on that top ring!
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Old 02-03-2018, 10:25 AM
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Wow, that sucks. Looks like it went lean.
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Old 02-03-2018, 10:32 AM
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Bah! Amatuer!



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Old 02-03-2018, 01:48 PM
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Ouch. The run before this must have been quick! Block ok?
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Old 02-03-2018, 07:53 PM
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Originally Posted by 383vett View Post
Ouch. The run before this must have been quick! Block ok?
..... 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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Old 02-03-2018, 08:00 PM
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Originally Posted by tpi 421 vette View Post
Wow, that sucks. Looks like it went lean.
..... 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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Old 02-03-2018, 08:01 PM
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Originally Posted by JCrock View Post
Bah! Amatuer!



..... ... Nice ! .....
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Old 02-03-2018, 08:04 PM
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Originally Posted by Tom400CFI View Post


You got variable compression on that thing? That is quite the nice radius on that top ring!
..... I lost 13.4:1 in a hurry ! .....
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Old 02-03-2018, 08:10 PM
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The first thing I thought when I saw that pic was a foreign object of some sort was ingested by that cylinder ...
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Old 02-04-2018, 09:27 AM
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Originally Posted by PatternDayTrader View Post
The first thing I thought when I saw that pic was a foreign object of some sort was ingested by that cylinder ...
..... 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 .....
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Old 02-04-2018, 10:13 AM
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Originally Posted by C409 View Post
..... 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 .....
Yeah the crown looks damage free. At least free from foreign material type of damage.
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Old 02-04-2018, 06:25 PM
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Wow that sucks, Bob but you're not wasting any time getting it back together for more runs. A true gearhead! I'm curious to know how this happened if your readouts logged showed everything in tolerance.
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Old 02-04-2018, 07:54 PM
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..... Top View .....


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Old 02-04-2018, 07:59 PM
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..... Another angle .....


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Old 02-04-2018, 08:02 PM
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Originally Posted by C409 View Post
..... Top View .....


Oh yeah that's unmistakable. Its just melted away ...
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Old 02-04-2018, 08:09 PM
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Originally Posted by C409 View Post
..... Top View .....


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)?
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Old 02-04-2018, 08:20 PM
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Originally Posted by 1985 Corvette View Post
Wow that sucks, Bob but you're not wasting any time getting it back together for more runs. A true gearhead! I'm curious to know how this happened if your readouts logged showed everything in tolerance.
..... 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 ! .....
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Old 02-04-2018, 08:20 PM
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Originally Posted by bjankuski View Post
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)?
That would do it. Lean mixture leads to combustion temps that are to high, which leads to a deformed piston, which leads to a stuck ring, which leads to blowby, which leads to the oil being burnt off the cylinder wall, which leads to metal transfer, which leads to the pictures above, which leads to new pistons. Therefore fords are junk and the c4 wins.

Last edited by PatternDayTrader; 02-04-2018 at 08:22 PM.
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