G'day all,

i have just aquired an engine and im not sure about it's cc and power and what size prop to buy, i think it is 15cc mitsubishi (see pics).... Hence the name of the name of this thread.
this is the first time i have done somthing of this nature to an engine but i am not a stranger to engines.

thanks in advance for your help

TopGun

Hello,
If you remove the muffler, you can stick a popcicle stick into the exhust and gently turn the engine to mark it. Remove the stick and measure the distance from the mark to the end. This is the bore. Using a probe of some sort and a marker, you can do the same thing to find the stroke. With the piston at the bottom of the stroke, mark the stick at a fixed point on the cylinder head. With the piston at the top of the stroke mark the stick again. Subtract this measurent from the first and you have the stroke. Put both numbers into the displacement calulator at the link below and you will have the displacement. Don't forget to select only only one cylinder. Perth being close to the equador must be warm, right?


http://home.earthlink.net/~jalby/puter.htm

Dave

thanyou for your advice i shall put it to good use.

Yes it is usually about 30-35 degrees celcius here at this time of year but it was a bit overcast today..

any idea of what kind of propeller to use?

Topgun,
The prop size would depend on the engine size,power, type plane and size. If it is a 15cc, a fifteen inch prop would be good. A sixteen inch prop would be good on a larger trimmer engine.


Dave