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Post by KSR Moto on Jul 23, 2018 9:24:55 GMT -5
Have anyone tried to remove some material from the piston to make it lighter?
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Post by GrumpyUnk on Jul 23, 2018 12:05:19 GMT -5
Wow, you dancing with the devil if you try that. Looking at the pistons, there seems no extra material used when they are cast & machined. I'd be hesitant to taking a cut on the crown due to concern with the remaining thickness. I'd be hesitant to fiddle with the skirt areas due to thinness of the metal and concern with side-load of the piston against the cylinder wall overcoming leading to a collapsed piston.
What's left is the 'boss' for the wrist pin. How much can be removed? Dunno.
Perhaps drilling some holes in the skirts would reduce the total weight without compromising integrity. I am too lazy to try, and don't want to go through the R&R hassle.
tom
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Post by KSR Moto on Jul 23, 2018 14:03:29 GMT -5
Wow, you dancing with the devil if you try that. Looking at the pistons, there seems no extra material used when they are cast & machined. I'd be hesitant to taking a cut on the crown due to concern with the remaining thickness. I'd be hesitant to fiddle with the skirt areas due to thinness of the metal and concern with side-load of the piston against the cylinder wall overcoming leading to a collapsed piston. What's left is the 'boss' for the wrist pin. How much can be removed? Dunno. Perhaps drilling some holes in the skirts would reduce the total weight without compromising integrity. I am too lazy to try, and don't want to go through the R&R hassle. tom True, but for my next project I am trying to build a 47mm based 139qmb with high compression,and piston light enought that it weights the same as the 44mm piston,advanced timing and polished intake and exhaust.. even if the engine self destructs I dont really care because I can pick them up at price next to nothing |
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Post by golfmech on Jul 24, 2018 20:38:49 GMT -5
just grind the bottom of the skirt down its a $0.43 Chinese piston. I am certain its not factory balanced. if it pukes just spend $30 on another piston and cylinder and leave it alone
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