I've done a few Ryobis. One with CH and one with magneto. All Wacker engine parts for the muffler, mount and stuff. They run pretty good with a bigger carb. Nice engine for a Cub or a Decathlon. Too heavy to be an aerobatic performer though.

I've done 2 Poulans. Both 54cc. One was a twin ring and the other was a single ring. Actually, the single ring was a Craftsman, but same exact saw. They both had to be cut out of the saw. Kinda ugly and heavy. Both with synchrospark ignition. One was CH and one was RCIGN system. Both ran well, but heavy for the power they put out. Both engines weighed about 4.5 pounds with the muffler and ignition systems installed. They would swing a Pro Zinger 22-8 at about 6500-6700RPM with 40:1 mix and pump gas. Guys around here usually swing the same or similar prop on a BME or other commercially made engine at around the same RPM- so my power wasn't anything to laugh at-- they were just a bit heavy.

A stock G-62 weighs about 4.5 pounds with magneto---- BUT, it will swing a 22-10 or a 24-8 around 6700-7000RPM here.

I've got an old Pioneer saw thats reed valve induction. It's somewhere in the range of 64-67cc. I'd have to definetly use an elec. ignition system with it. I've talked to Ralph about converting it, but I'm concerned with getting parts if it ever needs repair. I think it would be kinda heavy, because the cylinder fins are HUGE and bulky. Looks like a lot of metal there for cooling. Looks heavy.

I need an engine that will turn a 22-10 or a 24-10 prop up in the 6500-7000 RPM range, but it's gotta be LIGHT.

Anyone have any conversion experience with engines in the 60-70cc range that are light enough to bolt on an 80" Extra 300S? Will it swing a 22 or 24" prop at decent RPMs?

Thanks

A 62cc Zenoah chainsaw conversion, same cylinder and piston as the G62 sold for airplanes, weighs 3 lbs, 12 oz, with ignition inside the mount, NGK CM6 spark plug with a DA shielded cap..I just made a deal with Dave at DA to use his caps so with the CM6 spark plug they're lighter than the RCJ7Y normally found in a G62.......I have one here, just weighed it, that's what it weighs without a 2 ounce battery and muffler...I use an old spring scale, but it can't be too far off.....The chainsaw 62 has a magnesium alloy crankcase and a slighty smaller diameter crank....They were sold as Green Machines and now as Red Max...
If you want thrust you can use a 24-8 prop, slower but stronger...
A stock G62 mag engine with a Bennett mount, no muffler, no spring starter, weighs 5 lbs 2 oz on the same scale...20 oz more....1.25 big lbs...

Hey i just acquired a pioneer model 1110,all i know is it was made in 1965 or 66.Since you have a pioneer do you have any idea on this saw as to size etc. Thanks[&:]

I have no idea what size saw you have.

You can find out though. Remove the spark plug and drop a long wire down the hole. Measure the stroke from BDC to TDC. Record your #s.

Now remove the muffler and bring the piston to BDC and measure across the cylinder- top of the piston.

Volume = area X height

Example:
2.75" stroke and a 2.5" bore

Area = Diameter / 2 = radius
radius x 2 x 3.14 (pie)

V = (2.5 / 2 = 1.25)
1.25 X 1.25 = 1.5625 Radius
1.5625 x 3.14 = 4.90625 (Area)
4.90625 x 2.75 = 13.4921875 (cubic inches / volume)

Approx. 211cc

I'm not the best mathmetician, but thats the formula to determine volume.
My calculations to convert C.I. too CC's leave a bit to the imagination, but it's close.

Rcpilet,

The formula for figuring the area of a circle, and later a cylinder is: radius X radius X 3.14 (pi) and then X stroke to get the displacement.

There is a significant difference between: radiusXradius and radiusX2.

Hope this helps.

Doug

Another easy formula for displacement is:

Bore x Bore x Stroke x .7854 = cubic inches

Cubic inches divided by .061 = cc's

Good luck
AV8TOR

Thanks everyone I had no idea such knowledgeable people were on this site.Your info will be very helpful as a matter of fact I intend to print off your answers for later reference.

Thanks for catching that Doug.

You can see by my example, that I DID use the correct formula. But, I didn't word it right. Thanks for that clarification.