Piston weight 4.2 NA engine
#1
05-16-2012, 06:45 AM
Piston weight 4.2 NA engine
Does anyone know what the piston of a 4.2 NA engine weighs? Preferably with wrist pin & rings?
As some of you have seen in my latest dyno graph, power is still climbing until 6200 rpm, so am contemplating upping the redline a bit to test. I think the NA engines have the same conrod, so my thinking is if they can handle pull forces at 7000 rpm, and if the weight difference is marginal (I expect the SC version to be slightly heavier), then I want to try to up it to 6500/6600 rpm.
Here are the ones for a 4.2 SC engine in grams
Piston with rings = 322
Wristpin = 117
Conrod (with bearings) = 591
As some of you have seen in my latest dyno graph, power is still climbing until 6200 rpm, so am contemplating upping the redline a bit to test. I think the NA engines have the same conrod, so my thinking is if they can handle pull forces at 7000 rpm, and if the weight difference is marginal (I expect the SC version to be slightly heavier), then I want to try to up it to 6500/6600 rpm.
Here are the ones for a 4.2 SC engine in grams
Piston with rings = 322
Wristpin = 117
Conrod (with bearings) = 591
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mchiti1 (05-25-2012)
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