[lindy 911]

I did a little research before building my 3.0 twin-plug and found that the Alusil cylinders need a special piston AND rings. There are metallurgy requirements to make the combination work. I chose to use JE with Mahle cylinders because of the nickle plating or Nikasil. Alusil is a completely different animal than Nikasil. The JE pistons and rings are designed to run in the nickle bore and the make up of the aluminum in the JE is designed to expand and contract similar to the Mahle cylinders. The scoring at noon and six would be skirts getting to big for the cylinder bore.

I don't think detonation is the cause of this. Detonation will break parts before it heats them to this point. My experience is that the piston crown, head and con-rod bearings are gone way before the piston has a chance to heat to the point of seizure. I definitely think new piston and cylinders are on you build sheet.

There are some fellas here that can give you a much better explanation than me but that's the skinny of it.

FWIW, I'm using BURN-BROS twin dizzy and MSD 6AL with twin coils. I looked at cheaper stuff but came back to this.

Lindy