Harley motor in a homebuilt?

So, the only hard part is designing and building the PSRU. I've seen
the one at http://www.hog-air.com/. From the pictures it looks like it
ties in to the cylinder heads, while the engine mounts are at the base
of the cylinders. It seems this would put a bending stress on the
cylinder bases that they were not designed for. I hope to get a first
hand look at it next month and ask the designer about it.

Couldn't find any specs on the engine other than the torque at 3000 RPM,
and the Harley web site, like the hog-air web site, was kind of a pain
to navigate.

Any idea if they have the power curve on line?

thanks

Ed Wischmeyer

Ed Wischmeyer wrote:
Couldn't find any specs on the engine other than the torque at 3000 RPM,
and the Harley web site, like the hog-air web site, was kind of a pain
to navigate.

Any idea if they have the power curve on line?

thanks

Ed Wischmeyer

There's a "list of verified horsepower figures for a variety of the Twin
Cam 88 and 95 CID Engines" at
http://www.nightrider.com/biketech/hplist_twin_cam.htm

If you drop down to the first 68 hp motor 88 CID engine listed, you can
click on it and get a dyno chart at
http://www.nightrider.com/biketech/dyno_sheets/max_green_tcdyno.jpg

Just looked up what the Harley website says about torque at 3000 RPM;
they claim peak torque of 85 ft-lbs. The dyno chart referenced shows a
peak torque of about 76, maybe 77 ft-lbs at 4000 RPM. Harley's probably
measuring at the crank; the dyno chart is of measurements taken at the
rear wheel.

hope this helps,
--
David Hill
david at hillREMOVETHISfamily.org
Sautee-Nacoochee, GA, USA