I used Tech Line's CBC1 Powerkote (Cermet Coating Thermal barrier) to coat the crowns of my 8.5:1 wiseco forged pistons...with ~ehhh~ results.
I can compare this because I have built 2 m20s with the exact same pistons, one with piston coating and one without.
The one without piston coating functions/sounds as a normal m20 should function.
The one with the tech line coating has piston slap until the pistons warm up, usually 5 minutes after initial cranking. The coating is doing its job too well. Would work for a full blown race motor, or maybe a motor that sees nitrous (large spike in CC temps), but i would not recommend it in a street motor. EGTs are just a tad higher too, so we know where the heat is going.
Both of these engines are assembled as street/track dual purpose motors. The coating was properly applied with an airbrush at 75 deg. F and subsequent to drying, baked at 300 degrees F for a total of 65 minutes to full cure.
Derek
DedericMS
I can compare this because I have built 2 m20s with the exact same pistons, one with piston coating and one without.
The one without piston coating functions/sounds as a normal m20 should function.
The one with the tech line coating has piston slap until the pistons warm up, usually 5 minutes after initial cranking. The coating is doing its job too well. Would work for a full blown race motor, or maybe a motor that sees nitrous (large spike in CC temps), but i would not recommend it in a street motor. EGTs are just a tad higher too, so we know where the heat is going.
Both of these engines are assembled as street/track dual purpose motors. The coating was properly applied with an airbrush at 75 deg. F and subsequent to drying, baked at 300 degrees F for a total of 65 minutes to full cure.
Derek
DedericMS
