Originally Posted by
Z'Stein
Wow! Damn good information. Thanks, and with that information I'm sure I can improve on what I have been doing to these little engines. I have a question though; I notice that most of the top engine modifiers are putting this "red putty" (or something) in the crankshaft to better distribute fuel into the crankcase. How can I do that and what material are they using? Thanks.
The red silicon filling is mainly there to fill the bore of a drilled out crank.
Tuned cranks are drilled hollow to save weight.
There are engines that have that ramp simply milled into the steel.
So, first you have to drill the crank on a lathe with a damn good HSS drill. (cranks are usually hardened)
Then you find some Aerexon Motorsil D (or something similar), fill the hole and fix the crank in the correct position to let it level and dry for at least 24 hours.
I have seen someone to pour silicon into a crank that was not drilled. You only get a thin layer of silicon in their which will not hold, so don't try that.
It wouldn't improve performance anyways.
Hope this helps.