Ive recently decided to start modifying some nitro engines. Ive read many great articles on the subject and talked to a few people who do it themselves but still have questions.
1. If I knife-edge the piston rod how do I balance out the crank? Is it just a guesstimation of how much you took off the rod, you need to take about that much off the other side of the crank?
2. Im also A little worried about scavenging the ports. I dont want to mess up engine timing and negate all the work I did to the engine. Is there a fool-proof way of figuring how much to scavenge from the ports without a timing error? A link to an in depth article would be nice if possible.

I have many other questions that I cant think of right now so Ill be coming back here to keep posting questions.

P.S. To anyone that wants to modify nitro engines but thinks its part their capabilities, It isnt. Its not rocket science. Its all about how fast the fuel/air can pass through the engine. Make it pass through faster and your engine will be faster.