hi all,
i have two questions.first what is the difference between slide and rotary carburetor?which is better for onroad car?second what's the difference between standard and SG shaft? advantages?


many thanks.

Rotary Carburettor: Carried over from airplane engines when they were adapted for car use. For most hobbyists and racers this type of carburetor is fine, because it is simple to install and adjust. The throttle servo turns a "barrel", which has a hole through it, and this controls the amount of air going into the engine. A needle valve on the carburetor controls the amount of fuel going into the engine.

Slide Carburetor: a highly modified, car-specific type of carb that has the barrel of the carb slide along its axis, instead of turning. This provides a quicker response at the expense of a complicated set-up procedure. This type of carb will benefit a small number of racers and is not suggested for casual hobbyists. Two or three needle valves control the fuel intake at different RPM ranges.

Taken from http://www.rcpro.com/rc-dictionary.html#S

Standard and SG shafts are slightly different variations of crankshaft. Some flywheels & clutch assemblies require SG, some standard. Neither offers better performance than the other.

[link=http://www.wheelspinmodels.co.uk/products/nr94101.jpg]SG[/link]
[link=http://www.rceasy.com/wp-content/uploads/2007/10/15107_02n.jpg]Standard[/link]

If you can make a sg(the longer one) crank work in what ever application your are running you are better off using one. With the standard crank you have to run a pilot shaft for the clutch bell bearing to run on. Because this is threaded on it it impossible to get exactly true with the crankshaft. Most of the time it is very close and you wont notice too many problems, however if it out it can cause vibrations and uneven wear on the clutch bell. The sg is all the one shaft and has a greater chance for everything to be inline.

Also, a slide carb has more lineant response, better for on road
Where as a rotary carb has more response in the midrange, better for off road

thanks men, nice info.