Originally Posted by
stefan
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.
Yes, that does help. Thank you for the feedback. Although I have been at this for quite some time, it is amazing how much I "don't" know about these little engines. Just picked up a new cheap engine that I am about to do some serious experimenting on based on Roelof's and your information. Thanks.