? Weight of stock LT1 pistons ?
#16
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Join Date: Sep 2000
Location: Old Bridge Township Raceway Park
Posts: 324
Re: ? Weight of stock LT1 pistons ?
Hahaha.. ok so the verdict is out or maybe just 1/2 way in It's probably pretty close to the speed pro pistons though.
I'll have some more stock pistons here in a week or two & will get 'em weighed when I bring my block in.
I'll have some more stock pistons here in a week or two & will get 'em weighed when I bring my block in.
#17
Re: ? Weight of stock LT1 pistons ?
Mahle has been the OEM for most manufactures for a long time, they are the largest piston producer in the world. They made the pistons for LT1, LT5, 4.6/5.4L, etc.
#18
Re: ? Weight of stock LT1 pistons ?
Ok....
Now how about a quick lesson in the physics of engine building.
Using the simple Force = mass x acceleration (F=ma)
To use it in this we have to use Kg for the mass, piston G's for the RPM, stroke and rod length and then mulitply that by gravity and then convert to lbs of force. So to find the Force on the Rod and Crank
F = Kg x Piston G's x 9.81m/s^2 x .2248
Stock Piston
@ 6500rpm = .532 Kg x 2720 g's x 9.81 m/s^2 x .2248 = 3191 lbs of F
@ 7000rpm = .532 Kg x 3160 g's x 9.81 m/s^2 x .2248 = 3707 lbs of F
Now switching to a Mahle 4.030 stock replacement piston (5.7" Rod)
@ 6500rpm = .464 Kg x 2720 g's x 9.81 m/s^2 x .2248 = 2783 lbs of F
@ 7000rpm = .464 Kg x 3160 g's x 9.81 m/s^2 x .2248 = 3233 lbs of F
Now going to the 6.0" Mahle piston
@ 6500rpm = .429 Kg x 2690 g's x 9.81 m/s^2 x .2248 = 2544 lbs of F
@ 7000rpm = .429 Kg x 3120 g's x 9.81 m/S^2 x .2248 = 2951 lbs of F
So you can see how just taking that mass out of the piston lets you load the crank and rod about the same amount 500rpm higher, and when you go even lighter it loads them even less. You can get crazy and get the Force down to 2400 lbs @ 7000rpm by going to really light weight pistons. That would be equal to about 5600rpm on the stock pistons, a gain of 1400rpm.
Bret
Now how about a quick lesson in the physics of engine building.
Using the simple Force = mass x acceleration (F=ma)
To use it in this we have to use Kg for the mass, piston G's for the RPM, stroke and rod length and then mulitply that by gravity and then convert to lbs of force. So to find the Force on the Rod and Crank
F = Kg x Piston G's x 9.81m/s^2 x .2248
Stock Piston
@ 6500rpm = .532 Kg x 2720 g's x 9.81 m/s^2 x .2248 = 3191 lbs of F
@ 7000rpm = .532 Kg x 3160 g's x 9.81 m/s^2 x .2248 = 3707 lbs of F
Now switching to a Mahle 4.030 stock replacement piston (5.7" Rod)
@ 6500rpm = .464 Kg x 2720 g's x 9.81 m/s^2 x .2248 = 2783 lbs of F
@ 7000rpm = .464 Kg x 3160 g's x 9.81 m/s^2 x .2248 = 3233 lbs of F
Now going to the 6.0" Mahle piston
@ 6500rpm = .429 Kg x 2690 g's x 9.81 m/s^2 x .2248 = 2544 lbs of F
@ 7000rpm = .429 Kg x 3120 g's x 9.81 m/S^2 x .2248 = 2951 lbs of F
So you can see how just taking that mass out of the piston lets you load the crank and rod about the same amount 500rpm higher, and when you go even lighter it loads them even less. You can get crazy and get the Force down to 2400 lbs @ 7000rpm by going to really light weight pistons. That would be equal to about 5600rpm on the stock pistons, a gain of 1400rpm.
Bret
#21
Re: ? Weight of stock LT1 pistons ?
Originally Posted by MachinistOne
Now we should calculate out effects from valve weights stock vs manley street SS, ferrera 6000, hollow stem etc, Ti retainers, ...
Bret
#26
Re: ? Weight of stock LT1 pistons ?
Originally Posted by Sunsceamer
what? no one knows?
I just weighed them today...
Stock LT4 PM rod - 603.5g/ 422 big end
Stock GM forged - 604g/ 422 big end
so they weigh exactly the same.
#28
Re: ? Weight of stock LT1 pistons ?
I have been trying to rebuild my engine and just getting back into it and I figure I need good rods and it was mentioned that some forged are light and the formula shown showed a big diff in some app and was wandering would you get the same effect with rods. Stronger and light sounds like a great combo.
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