Leiden - February 17, 2009 09:28 AM (GMT)
You make me so jealous :(
Just a question, why is it necessary to get the whole assembly balanced when shaving the crank?
I thought you could get away with just balancing the crank?
Could you get away with just taking the 2mm off the bottom of the piston's instead of the crank?
xnickx - February 17, 2009 09:35 AM (GMT)
Great job and write up Andrew! Looking forward to see the results!
Decided what turbo your going to be using yet? Sticking to the HKS GT2871?
Leiden - February 17, 2009 09:56 AM (GMT)
Oh and another question, the Gudgeon End of the rods kind of float left and right on the ST246 pistons I have here,
Why is there so much left to right play between the Piston and the Gudgeon End? It has about 2mm play each way :blink:
Distrb - February 17, 2009 08:36 PM (GMT)
QUOTE
You make me so jealous :(
Just a question, why is it necessary to get the whole assembly balanced when shaving the crank?
I thought you could get away with just balancing the crank?
Could you get away with just taking the 2mm off the bottom of the piston's instead of the crank?
Because it is all a part of the same rotating mass. Think about it, you bolt the pulleys to the crank, and the flywheel and clutch to the crank. This all affects the balance. I’m of the opinion you should be balancing anyway to reduce internal engine loads and vibrations that put undue stress on components that eventually lead to a failure. Build it properly, build it to last.
Few reasons why I didn’t machine 2mm off the pistons. One is because it is easier to get right and less time consuming to shave the crank, rather than 8 sides of individual pistons. Two because there is a lovely coating there I wish to not damage any more than I have by grinding clearance for the oil squirters. And Three because it reduces the overall height of the piston which could lead to it being unstable in the bore when rotating. In short, its quicker and easier to get right.