FIXX

iTrader: (2)

dude you come on here asking about bearings then all the pros on here state their openion now you say you melted a piston????????????????
Its most likely from your rings or the ring carving at the cylinder wall....what a waste of peoples time and posts...

the deep

iTrader: (8)

Dancing around the real problem.....

supermx96

I cant imagine a melt piston can contaminated the oil pass trough the oil filter and do that on the bearing, i am not a profesional engine builder i build my engine by passion.

I realy think that is not the melt piston do that but as i said i am not an expert to know what is realy happened to the bearing.

I think oil heat and oil cavitation can do that

MER Performance

I must say that melting the piston, will contaminate the oil! I feel we have been playing a guessing game here and wasting time. I don't care what you have for a oil filter, small micron or large, the small silica from the alum. burning away is going to most likely pass the filter or when the by-pass opened. Sorry to say; but I DO NOT SEE SCRATCHES IN THE BEARING, only embedded particles. Why did you melt the piston?

blue thunder

I am rebuilding an engine now with a burnt piston. I have some bearings that look just like that. The oil was sooty from combustion gas and the oil was rather over heated looking/smelling. That is what I attribute to the bearings that look like this.

supermx96

I think i melt the no.6 piston due to a bad fuel distribution setup and during an engine test, the no. 8 have sufer also of pre ignition.
I ran 9 psi boost with b&m 250 blower with foward ofset carb plate, 7.5:1 comp ratio / performer rpm marine aluminim head i have run all the sumer long with a meth injection system with an afr between 10.5 to 11. During the fail test i run without met inj and my afr go up to 12.5 wot.
The piston # 5-7 no sing of pre ignition but much more leaner than the # 1-3 and the # 6-8 have sing of pre ignition (# 6 melt) also much more leaner than the # 2-4.

I have also fond a blown head gasket between #6 and 8 cylinder as i can see on the cylinder block.

Pic of the melt piston and better of the bearing:

the deep

iTrader: (8)

The second and third pictures are the Direct result of the first picture . Now you know what happened . Clean everything good before you rebuild and make sure she no sing of pre ignition no more .

Young Performance

Did you replace the oil cooler after the piston failure? If not, do so now.
Eddie

supermx96

Thanks for advice.

FIXX

iTrader: (2)

Do yourself a favor and get a set of je or srp piston's..the speed pro pistons your running dont have as good quality of alunimum as the je or srp pistons..