Engine Dynamometer Fabrication

[Brett C]

Our department recently purchased a water brake engine dynamometer and then let it sit until someone decided to set it up. We already know that we need to run a closed loop system with the necessary pump and motor combination to meet our pressure and flow requirements, but I was curious as to how other teams couple the engine with the dynamometer, whether its interlocking the shafts or doing a chain and sprocket set up? We are running a F4i engine by the way. Also, since the transmission is directly coupled with the engine, do you guys perform your load curves in various gears or do you just stick to 1st?

Thanks, and if anyone has any pictures of your current set up that would be great.

Brett
Miami University
collinbe@muohio.edu

[Brett C]

Our department recently purchased a water brake engine dynamometer and then let it sit until someone decided to set it up. We already know that we need to run a closed loop system with the necessary pump and motor combination to meet our pressure and flow requirements, but I was curious as to how other teams couple the engine with the dynamometer, whether its interlocking the shafts or doing a chain and sprocket set up? We are running a F4i engine by the way. Also, since the transmission is directly coupled with the engine, do you guys perform your load curves in various gears or do you just stick to 1st?

Thanks, and if anyone has any pictures of your current set up that would be great.

Brett
Miami University
collinbe@muohio.edu

[The Bunker]

As far as dyno connections go, I would recommend a Love Joy coupling that connects your output shaft to the dyno shaft. Chains and belts tend to wear out rapidly. We are also in the process of getting our dyno up and running. If you want we could send pics of what we have so far.

Brett
Rocket Motorsports

[rjwoods77]

http://fsae.com/eve/forums/a/tpc/f/8356059423/m/87510195831

Or just mount it right to the output shaft. Yours would be much shorter than mine since the output spline is shorter but where mine is keyed you can spline yours. Use the bolt that draws through the unit (assuming a dynomite) to bolt into the treaded portion of the splined output and that will hold the whole thing together. In a perfect world if the trans has a 1:1 ratio in one of its gears then you want to do that. Makes things simple because you dont have to worry about rpm compensation between gears. I would even go as far to see if you could put the adapter right to the crankshaft so you dont have losses/inconsistancies from clutches and gear efficiency. Sherbrook has been doing this for years for their cvt system on their car by replacing an angled side cover with a place and take off shaft.

[rjwoods77]

http://fsae.com/eve/forums/a/tpc/f/125607348/m/82610255...10106831#32610106831 (http://fsae.com/eve/forums/a/tpc/f/125607348/m/82610255831?r=32610106831#32610106831)

This too for previous discussion.