Racers. Check out these pistons!
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Nitrous???
1st and 3rd pictures are from running to thin.
2nd picture is from the water temp getting up to 270. Bearings and rings remained in great shape, running Schaeffers racing oil 20-50.
http://www.schaefferoil.com/datapdf/705.pdf
2nd picture is from the water temp getting up to 270. Bearings and rings remained in great shape, running Schaeffers racing oil 20-50.
http://www.schaefferoil.com/datapdf/705.pdf
Thin as in lean feul mixture? The bent rod is interesting because 270 isn't hardly hot .
Salesrep: I have seen a number of tuners loose rod bearings and never accept the fact it was caused from lean A/F ratios.
In one case, you could see how the rod was 'blued' from the heat. Piston suffered damage too.
Apparently, No one reads plugs anymore.
I grew up working on Hilborn Injection Systems. They were notorious for running dangerously lean with a rich, sooty exhaust...Robert
In one case, you could see how the rod was 'blued' from the heat. Piston suffered damage too.
Apparently, No one reads plugs anymore.
I grew up working on Hilborn Injection Systems. They were notorious for running dangerously lean with a rich, sooty exhaust...Robert
Wow, how did the temp get up to 270?!
My guess is it was a circle track racer with some kind of cooling system problem who didn't want to drop out of the race.
Mr. Herndon, guys with EFI cars often eschew plug reading as old technology they don't need because they're computers are so great. So great, in fact, that they have to pay other people to tune their cars for them!
My guess is it was a circle track racer with some kind of cooling system problem who didn't want to drop out of the race.
Mr. Herndon, guys with EFI cars often eschew plug reading as old technology they don't need because they're computers are so great. So great, in fact, that they have to pay other people to tune their cars for them!
The first and third photos look like detonation and the second looks like too much NO2.
Anyone who's modified and raced air cooled 2 strokes has likely seen pistons similar to the 1st and 3rd. You keep getting more and more power out of them - right up until you reach the thermal limit of the piston. Lean mixtures get you there long before that.
I'm really amazed at the 2nd one. I cannot believe the rod didn't break!
I'm really amazed at the 2nd one. I cannot believe the rod didn't break!
Wow, that bent con rod is awesome. I'm impressed it bent that far and didn't break. I was at Norwood Engineering in Dallas, TX one time and saw a little collection of broken pieces they had. The coolest I can remember is a piston with the bottom half of an intake (or exhaust) valve mashed into the surface of the piston.
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