View Single Post
Old 12-07-2016, 01:30 AM   #8 (permalink)
Tugger
EcoModding Lurker
 
Join Date: Nov 2016
Location: Uranus
Posts: 23
Thanks: 0
Thanked 10 Times in 8 Posts
Awesum Plus.

Hmmmmm doubts and misgivings...

Vegetable oil is not a good idea. It will evaporate out, as it runs past the hot parts, like the top ring and edge of the piston crown etc., and leave the heavier fractions to bake on as a varnish - gumming up your rings and bores.

Shaving off weight? It will be of some value - but most of your improvements will come from keeping it well tuned and perhaps rewinding the alternator to 12V and perhaps going with a high energy sparking system - AND - building a "1/2" to "full fairing" for it.

http://thekneeslider.com/images/2009/12/mg-v8c1.jpg

https://greasengasoline.files.wordpr...-400-copy1.jpg

In reality, you really cannot extract heaps of power from a small engine, and SOME benefit can be obtained from lowering the final drive gear ratio, a little. The trade offs begin, in having so little power to begin with, that any real variation too the equation of RPM <=> TORQUE, means that while it may go at say 40% less fuel with a full fairing, when the desired road speed is set to run at the motors highest power output (optimum position on the torque curve), that any increase to the resistance to forward motion, such as head winds, hills and cross winds, will immediately strain that lofty ideal, and require shifting gears, increasing power etc., to keep the engine at it's optimum position on the torque curve.

My good friend Phil Irving wrote a book, "Tuning for Speed", which with some intelligent reinterpretation, can be rephrased as "Tuning for optimum efficiency" (not necessarily for going fast).

I am assuming that this is a 2 stroke, in that the factory engineers, may have designed a very good engine, that is both of a reasonable power output, while remaining relatively frugal to begin with.

While tuning it to produce a lot more power, may seem a good idea, it's a false economy, both in terms of engine life and the obtainment of spares, as well as supplying more fuel to produce more power.

However, tuning an engine to be of a modest power output and to be very frugal, in combination with lowering the bike and riders Coefficient Of Drag, and greatly extending the engines life span, requires a magnitude of intelligent planning and design, beyond fitting a good racing carb, reed valves and a highly tuned exhaust for a high revving engine.
  Reply With Quote