cmetzner
09-04-2007, 10:44 AM
Tom / Anyone:
I pulled the SC off my car for various reasons. I changed plugs from the 7's I was using to the stock 5 heat range.
The 7 iridium plugs were rust colored around the last couple of threads. I looked into the cylinder and the pistons also looked rust colored.
Is this normal for the 7 heat range plug? Is it the result of too cold a spark and using the Torco race gas additive? Please tell me it is not a blown head gasket?
I have not been using coolant and there is no oil film in the radiator. I also use water injection. But that appears to be working normally and not using an inordinate amount of water. I checked and it is coming on at 4lbs.
I am hoping that it is the result of the cold plug and me just running the car a few miles a day to work and back.
Just saw this narrative and I think it applys as the Torco additive has MMT:
Some fuel refiners in several areas of the United States have introduced a manganese additive (MMT) for unleaded fuel. During combustion, fuel with MMT causes the entire tip of the spark plug to be coated with a rust colored deposit. This rust color can be misdiagnosed as being caused by coolant in the combustion chamber. Spark plug performance may be affected by MMT deposits.
I pulled the SC off my car for various reasons. I changed plugs from the 7's I was using to the stock 5 heat range.
The 7 iridium plugs were rust colored around the last couple of threads. I looked into the cylinder and the pistons also looked rust colored.
Is this normal for the 7 heat range plug? Is it the result of too cold a spark and using the Torco race gas additive? Please tell me it is not a blown head gasket?
I have not been using coolant and there is no oil film in the radiator. I also use water injection. But that appears to be working normally and not using an inordinate amount of water. I checked and it is coming on at 4lbs.
I am hoping that it is the result of the cold plug and me just running the car a few miles a day to work and back.
Just saw this narrative and I think it applys as the Torco additive has MMT:
Some fuel refiners in several areas of the United States have introduced a manganese additive (MMT) for unleaded fuel. During combustion, fuel with MMT causes the entire tip of the spark plug to be coated with a rust colored deposit. This rust color can be misdiagnosed as being caused by coolant in the combustion chamber. Spark plug performance may be affected by MMT deposits.