britbrat
Posts: 3299
Joined: 6/15/2004
From: Deep River, ON, CANADA
Status: offline
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quote:
ORIGINAL: loughbd
Pretty expensive way to learn something. Also a shame to ruin an engine just to see if you can make it more powerful. Funny how all the big boys who are into racing including pylon racers and C/L speed guys use tuned pipes to gain more power. Think maybe they know what they are doing?? They sure aren't chopping up their engines. Guys like Dubb Jett design their engines for max power without the need to chop on them. Most R/C engine manufacturers design their engines to be as powerful as possible while still maintaining reliability and a good idle. They have to to be competitve. So far none of you have mentioned anything about the crankshaft and venturi. Back in the days when I ran Rat Race and C/L speed that was one of the ways to get more out of an engine. It was also one of the "tech tips" Hi Johnsom put out for improving the power in a Johnson engine.
You just don't read -- intact tract tuning has been specifically mentioned, as have crankshaft induction-passage mods.
Why do you assume that "we" don't know what we are doing? Many of us have been playing this game for a long time (over 50 yrs in my specific case). It used to be quite necessary to modify engines years ago. The Oliver Tiger was the rat-race king at one time & the very first thing that you had to do to have even a ghost of a chance of winning was to drill the crank passage as large as it could stand, chamfer the crank outlet, square the ports & chamfer the inner lips of the ports -- or you were a loser. Further refinements included chamfering & polishing the rotary-valve inlet opening, pollishing the inlet passage --- etc, etc. Guys who left their engines stock were just spectators. If you know that, what is your problem?
Manufacturers produce engines for a market price point & carefully planned profit margin. They will market it with enough power & reliability to be acceptable in the market place at their offered price -- but not to extract every bit of power available & certainly not to be the most reliable out there. OS is an excellent case in offering acceptable, but not outstanding power, combined with minimum acceptable reliability & the maximum price that the market will bear.
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> RE: Increasing 2 stroke performance - how? 
RE: Increasing 2 stroke performance - how? - 
actually it is funny that you mention the crank as that is the next part I want to mod. I want it to be similar to the crank in highend buggy engines(turbo cut ) to just add a bigger engine isn`t all that fun, even you could do that 
. I know all about expensive engines as I run both os, 
)
