quote:

ORIGINAL: Reiko

Jeez, it's not that big a deal for some to get all in a huff over. I agree with vladconnery about discoveries and disasters being the beginning of some great developments. Perhaps these little engines have been around so long as to have every conceivable modification done, but then perhaps not. There is nothing wrong with giving it a shot, and it takes a decent individual to post an experiment into this community and ask for opinions.

To address the crank mod - if I remember correctly from high school (oy... long time ), knife-edging the crank counterweights was an effort to decrease the rotating mass and offset the weight of aluminum rods, and also smooth the friction of the crankshaft's interaction with the engine oil. I might be nuts, but it seems to me that lightening the crank can yield at least a bit of improvement on any IC engine (even though no crankcase oil volume). Feel free to correct me otherwise. It's been a while!

mfroot, nice work, and thanks for sharing.

quote:

ORIGINAL: adam-69

haven't had a chance to read the whole thread but here's my comments.
-i don't know enough about modding to critisize or praise your porting or timing
-i do know that it looks very well done (from a machining point of view) and hey, if it runs well clearly it was a sucess!

good job

quote:

ORIGINAL: mentorman

quote:

ORIGINAL: adam-69

haven't had a chance to read the whole thread but here's my comments.
-i don't know enough about modding to critisize or praise your porting or timing
-i do know that it looks very well done (from a machining point of view) and hey, if it runs well clearly it was a sucess!

good job

Now theres a person with a very good head on their shoulders... With that said, I beleive the article from R/C car Action, "How to hot rod your nitro motor" got alot of people asking questions, including me when I saw the article here on this site. I personally respect the magazines opinions and or articles for the most part, and their article about the porting didnt dissapoint. It was nothing radical, but basic cleaning up the sleeve ports with some grinding and polishing. It just makes the motor run better IMO. Anytime we do a modification on anything, we are risking making things worse, but for me and others I read about, the risk was worth it. Cheers.