Originally Posted by
Eivind E
No, they measure 4.95 when new. I just measured one right now.
Doesn't have to be the case.
Not at all, I'm very surprised you would say this. First of all they only measure 4.95 new.
After 8 gallons or so crank pin will probably be down to about 4.91-4.90, and rod will probably be at about 5.08-5.10.
At this point you send the piston/sleeve off to RayAracing for a repinch, fit a new rod, and run the engine another 8 gallons. By this stage the crank pin will be down to 4.82-4.84.
Once the crank pin gets down to 4.82 is when you risk rod failure and the rod will come out through the crank case.
If the crank pin still measures 4.90 it has plenty of life left and is still worth a new rod.
What you're saying is just not right at all.
No.
Wow, sorry. Your obviously the expert on all things nitro on here by the looks of it. Any brand, any model.
You go run your 4.8 whatever crank pin and enjoy it while it lasts.
If he is measuring with a set of verniers, it's safe to say he will probably see 5.0mm on a new crank.
I have a well used GXII Plus crank in the workshop that measures up on the micrometer at 4.977, so I don't know how you come up with 4.95 new ?
Jordan, if you have any questions on GO or any other brand in future, just PM Eivind E - seems he is the man.