Originally Posted by
rearviewmirror
One more new motor questions.
I have a new Go 5-port, I'm going to run it and break it in on 25% nitro juice. What should I do in regard to shims? There is a shim in the box, it looks to be made of copper. How much shimming should be done for 25%?
I think the GO engines come with 2 shims already fitted.a 0.1 and a 0.2 mm ..0.3 is good up to 25% nitro..then add 0.1 (the shim in the box) for each 5% increase in nitro content..you can also add the shim during break in for the first few tanks to lower the compression and lower temps as well..
If the pro's know better feel free to correct me here! but thats my rule of thumb anyway..