Hi all, I have or I should say I had a fully built h23 with Arias Turbo Pistons, Spark rods, Darton sleeved 780cc precion injectors. just broke it in. I had a friend of a friend tune it. I have an S300 with a P28 ecu. It was running really good at 9psi of boost and we decided to turn up the psi. When we did this we set it at 15psi boost cut. Made a couple of passes and fouled 1 cylinder spark plug. Check it out put different plugs in it and made a couple more passes. Started back firing and blowing blue smoke out of the exhaust and didn't wont to idle correctly. Did a compression test and all read 180psi when cranking engine over 5times. The #4 cylinder read only 60psi. Drop some oil down into the cylinder and it jumped up to 120psi. Well pulled the head off last night and Piston 1 and 4 where destroyed. Ringlands gave away. The pistons are just baked on the Intake side. They both broke on intake side also. Pulled 2 and 3 out also and they are ready to go also. I mean burned up really bad. Any ideas on what could of caused this? Plugs, Timing I dont know.
Drop me a line with any help.

 

Do you have a WBO2 wired into the S300? If so did you datalog the passes? I would check ignition timing and make sure you didn't run lean since it sound like detonation baked your pistons.

Pirate

 

Detonation for sure. What is/was your static compression?

 

Yah running an AEM Ugeo controller but not hooked up into S300. What do you mean by static compression

 

The compression ratio of your engine. What is it?

8.8:1?
13.0:1?
etc.

 

Its should be 9.1to1