Found hotspots while cleaning up my combustion chamber tonite. Not sure what to do.



Never saw past stock boost on stock turbo and 11psi on gt30r.

 

Hi, im a noob, what is a hot spot?

Thanks

 

u talking about the dimples on the top of the pic, or the carbon build-up?

 

those cute lil dimples

 

A few possible causes-
1) Someone dented the head
2) The engine is pinging( pre-detonation), Either from too lean a mixture, and/or too advanced spark timing

Is the picture taken before cleaning or after cleaning?

 

Looks like crappy mitsu casting to me.

 

You may have a fueling issue with your injectors. The valves look like the got a little too hot. By looking at the edges.

 

If I had to pick a side, it would be with the pre detonation, I've seen similar with some friends of mine while tuning some boost'd hondas.

 

thats a messed up situation

 

This is after cleaning, should I worry about it or try and grind/polish it out?

 

Bad casting

 

grind and polish that bish

 

Yes that definately looks like pre-ignition in the combustion chambers. Though I am sure that section could be smoothed out, the damage appears to be cosmetic more then anything.

 

yeah its jus cosmetic but the thing is my pistons are perfect which has me puzzled.

 

If you look very closely at the piston crowns there is no sign of det?