sr20 pitting fuuuuuuuuuuu

[word sux]

So I am doing all the gaskets and seals on my new sr20 and while I am cleaning up the deck and head to put the new head gasket on I notice some pitting on the outter edge of cylinder number 2...

I looked at the head and sure enough there was a good amount of pitting on the head on the number 2 cyliner but its only on the one side..

The car was running great before this fyi and since its only one cylinder I figured its not a bearing comming apart or somthing because then it would be on all the cylinders right??

This is also some very very light pitting on cyl number 3


I am thinking that due to carbon buildup on the top of the piston there is detonation that is causing the pitting.

any input here. idk what to do!

[word sux]

I think its just a really bad mis


prolly the injectors..


gonna have the head hot tanked and decked and checked for cracks

[word sux]

Been thinking about it and it wasn't missing at all..


I am wondering if it was missing with the previous owner and he fixed whatever problem it was and now I am just seeing the results of the detonation???

I didn't notice the pitting till I cleaned off the carbon buildup so maybe this has been there for awhile and was fixed???

[Kingtal0n]

So I am doing all the gaskets and seals on my new sr20 and while I am cleaning up the deck and head to put the new head gasket on I notice some pitting on the outter edge of cylinder number 2...

I looked at the head and sure enough there was a good amount of pitting on the head on the number 2 cyliner but its only on the one side..

The car was running great before this fyi and since its only one cylinder I figured its not a bearing comming apart or somthing because then it would be on all the cylinders right??

This is also some very very light pitting on cyl number 3


I am thinking that due to carbon buildup on the top of the piston there is detonation that is causing the pitting.

any input here. idk what to do!


not much you can do, except of course verify the tune. usually people overtime or overboost the SR20 type engines (86/86) and you get that pitting/damage. But if the stock ecu is being used and low boost is being used then you are left with mostly [mechanical/input] related failures (as you said carbon buildup, but also: oil in the combustion chamber, improper spark plug, improper octane)

usually this is due to overboost (too much boost for the turbocharger used such as a T-28 run up to 18psi) or too much timing (lots of people run 15* around full boost even through peak VE which is a mistake)

[word sux]

not much you can do, except of course verify the tune. usually people overtime or overboost the SR20 type engines (86/86) and you get that pitting/damage. But if the stock ecu is being used and low boost is being used then you are left with mostly [mechanical/input] related failures (as you said carbon buildup, but also: oil in the combustion chamber, improper spark plug, improper octane)

usually this is due to overboost (too much boost for the turbocharger used such as a T-28 run up to 18psi) or too much timing (lots of people run 15* around full boost even through peak VE which is a mistake)


dunno what the previous owner did with the car

motor is pretty much 100% stock

I am thinking a coil went bad or somthing and that caused a really bad miss and the dude just ignored it. It must have been missing and was fixed before i bought it because it was running and idleing fine and had plenty of power.