Blown Engine

[drew214]

Well I knew the 92 Talon AWD Turbo I just bought had a bad motor and no comp. in the 4th cyl. I figured it was a melted piston due to of course no comp. as well as oil every where coming from the 4th cyl area. So I pulled the motor and removed the head and sure enough 4 th pistin is melted. There is damage to the cyl wall but not to much where boring out can't fix. I'm thinking since the kid was running 15 psi and I'm thinking he was using regular gas due to melting the piston from detonation. What do you think? I know many people that run 1 big 16's and running 20 psi and not melting their pistons. So I think it was due to low octane gas.

 

[Flat Lined]

I'm running 16lbs on my 14b with pump gas and have had no problems(93 octane in North Texas), he must have been running pretty lean to melt the piston.

 

[FINETUNED]

I run 15 psi with my B16G on california's 91 octane so I would have to say that low octane is not the problem.. How about an oil change??? MOBIL 1 5W 30!

 

[drew214]

I believe he was running regular pump gas which is the low grade what is that 87 octane. Nothing else would melt the top of the piston, But detonation.

 

[nothing stock]

I'd look at the injector as the root of the problem.

 

[drew214]

I would say the injector also but have to think if you run low octane on a turbo car that's running higher boost then stock and a stock turboed care askes for High Octane Fuel. I talked to the kid today also and asked him what grade fuel did he use and of course "just regular" he said. I just called him a dumb ass.

 

[L2RTSiAWD]

Ya it could have been an injector issue. If he was running low gas and high boost you would more detonation across all cylinders not just number4.

 

[drew214]

That true also. I'm rebuilding the motor now with 95 pistons and other goodies and also going to throw RC 550cc injectors in.