Should I sand my sharp piston edges?
12-19-2007, 12:21 AM
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Should I sand my sharp piston edges? I got some -28cc mahale forged pistons and the tops are not domed but have a 1/8" ridge alone the edge and then the piston top drops 3/16 to a flat bottom. Well that ridge is sharp and I thought you were not suppose to have sharp edges. It is also a gray color? Is that plating? Should I not touch it?
12-19-2007, 07:47 PM
#2
I,m not sure about coating but I can help w/ the sanding ?. Using emory cloth to round the edges on pistons will create less hot spots and will decrease the chances for knock.
This is a practice we've used on our turbo buick for years. As for the coating I dont think the coating actually stays on the top of the pistons once they have been run. Due to high cylinder temps. I might be wrong about the coatings. but definitely do the emory cloth to the edges.
Doug
This is a practice we've used on our turbo buick for years. As for the coating I dont think the coating actually stays on the top of the pistons once they have been run. Due to high cylinder temps. I might be wrong about the coatings. but definitely do the emory cloth to the edges.
Doug
12-19-2007, 08:09 PM
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The Mahle coating is a dry phosphate that burns off after the initial start. It helps to prevent problems on dry starts. I really would not mess with it as Mahle pistons are ready to install out of the box. If there is a slight edge it's probably not enough to even worry about. Pics would tell the story.
