Chain Saw Dynamometer and other special tool

[tommyhnavix]

This place has some great chainsaw tools and information!
Might be a good resource .

A cool chainsaw dynamometer and load tester!!

www.madsens1.com/saw_special_tools.htm

More Dynamometers

I love the trimmer dyno on this site at bottom right!! LOL

www.land-and-sea.com/kart-dyno/kart-dyno.htm

www.magtrol.com/motortest/wbpb_applications.html

bbs2y.com/thread-65458-1-1.html

www.tlzone.net/forums/open-forum/91055-built-small-engine-dyno-work.html

www.patentstorm.us/patents/5507191/description.html

[sweepleader]

Several of these discussions mention the problems of connecting the engine to the power absorber with chains and belts causing losses and ratios that are difficult to account for. If the engine is mounted on a bracket that pivots on the crankshaft center-line and is restrained from rotating by a load cell the connection to the absorber becomes irrelevant to the power calculation. You measure the speed and torque at the engine as adjusted by the throttle and load absorber settings and forget the losses in the drive system. I did some research on this issue years ago with hot rods in mind. Most dynos are set up for easy engine mounting but a small chainsaw motor would allow for some odd brackets that a Chev V8 would not.

If the absorber were shaft driven with a coupling the fit over the engine drive sprocket similar to that used in the winch situation mounting would be greatly simplified. Now just gotta go build it, eh?