Pits in top of piston?

[buzzo65]

What could be causing the pits to appear in the top of my piston? I have a P5 running 30% with the Novarossi #5 plug (medium I think).

Not sure how many head shims there are.
Is this going to create trouble in the future?

Any help would be appreciated

 

[Nitroaddict]

the pits are a visual indication that the engine is pre-detonating, which will lead to bending a conrod very shortly. this is due to timing that is too far advanced. To correct this, you need to either add .1mm of head shims, goto a cold plug, or both. This is a serious problem, that needs to be corrected right away.

 

[sikz3]

what kind of engine are you running? I have a Novarossi TOP that has never been started. Right out of the box it looks like there are small pits on the top of the piston.

 

[Nitroaddict]

Originally posted by buzzo65
I have a P5 running

Sikz3 - you just killed a kitten, bro. Try to read the whole post, lol.

 

[buzzo65]

I inspected the piston with the head off. It wasn't as bad as I thought. I did switch to a colder plug and shorter plug. I think this may help. I ran it for a couple of tanks with a definate increase in power. Temps never got above 190.

BTW this is a SW Mod engine. He did an awesome job with it.

Thanks for all the help fellas

 

[sikz3]

I did not know what a p5 is. (just that it's a 5 port right?)

 

[Nitroaddict]

the P5 is made by REX. Its a nova based engine.

 

[sikz3]

so maybe these pits are a novarossi thing?

 

[Nitroaddict]

I doubt it. I run 3 RB Concepts engines, and I have no pits. They are also nova based engines.

 

[slothy]

i have a jp p5, and no pits on the piston.. Did by any chance u blow a glow plug ? my old siro did that the element fell apart, and the piston chewed it up