accuracy1

Looks like a tune issue. The piston is/looks burnt egts to high/ possiable lean/ bad gas/ bad injector. Just my 2 cents.

EGbobby

i just got it tuned by ross at precision about 2 1/2 weeks ago!!!!!! i always used 93 octane gas and i really didnt get on it that much since i had it. im mainly looking to find out if i can use the head or not on my new build because i spent over $2000 on my block/bottom end. thats why i want to know if the cams are type r cams or not, because if they are not i would like to get some type r cams because im going to boost on the new motor..

JayDM

Wow, that looks like a pretty big chip in the head Bobby. I'll take a look at it on Sat.

EGbobby

sounds good j. the dropped the crank off tonite i pick it up friday. and check out that head. do you see that welding inside the head?? and on the valve side did you check out the marks i was talking about?

accuracy1

The head should not be a problem take it to a machine shop and let them look it over the chip should be sanded smooth to decrease chance of hot spot. Like you should check your injector on the hole with the burnt piston because it isnt something that just happens. It is caused by detnation/ heat ie lean to much timing etc. Pistons will always burn it the thin/sharp portion.

Ross

the timing on his map is around 25 deg up top with a mid to high 12's air fuels at the tail pipe. I can not remember if he had a lower timing cover on the car, if he did then base timing would have been 15 deg. If not timing would most likley be lower as I would have retarded the distributer back. Previously to tuning the car it came in for a base line pulls and air fuels were in the 14's and I can not remeber what ecu was in it at the time.

EGbobby

...still not sure if they aretype r cams or not!!!

JayDM

Bobby, I will be over at your house 10am. Call me if you want, I just woke up. (long ass night)

EGbobby

type r cams?? or not!?

RPRacing

not lookin like it?