Shynon 7,427 #1 Posted February 22, 2017 So the other day I built a kohler for a customer and had no way to test run it. So I put this together. This is first version as I will be making improvements to this in the future. 20 Share this post Link to post Share on other sites
Aldon 4,826 #2 Posted February 22, 2017 I did a similar test rig last summer and also had plans to improve it for longevity. I never got around to it and may never do so. Handy though when you need it. 7 Share this post Link to post Share on other sites
Ed Kennell 35,146 #3 Posted February 22, 2017 Improvements ??? Are we talking a Cradle mounted dynamometer and magnetic pick up to measure torque and RPM. 9 Share this post Link to post Share on other sites
Shynon 7,427 #4 Posted February 22, 2017 10 minutes ago, Ed Kennell said: Improvements ??? Ed I am planning on adding something to put load on the motor. I want to be able to after the 1st hour of run time, to be able to put the motor under load for another 4hrs for break in. 4 Share this post Link to post Share on other sites
857 horse 2,581 #5 Posted February 22, 2017 I was kinnda hoping for a plow attachment after the development stages ,,,,,,,,lol This is a good idea,,,,,,,,,,,of course,,,there is always the storage space issue,,,,, I like it !!!! Howard857Horse in VA 2 Share this post Link to post Share on other sites
squonk 38,563 #6 Posted February 22, 2017 Run a belt to the wheels, ad a stand up sulky to the back and race it like Ben Hur! 9 Share this post Link to post Share on other sites
AMC RULES 36,936 #7 Posted February 22, 2017 Imagine a K-91 would look something like this... 4 Share this post Link to post Share on other sites
953 nut 51,014 #8 Posted February 22, 2017 5 minutes ago, squonk said: Run a belt to the wheels, ad a stand up sulky to the back and race it like Ben Hur! Sounds like that would be Ben HURT! 5 Share this post Link to post Share on other sites
Ed Kennell 35,146 #9 Posted February 22, 2017 (edited) Add a tub and put it to work. Edited February 22, 2017 by Ed Kennell 4 Share this post Link to post Share on other sites
tunahead72 2,329 #10 Posted February 22, 2017 Shynon, when you build one of those stands for me, my back would appreciate you raising the engine up to about waist level or so. Thanks! 3 Share this post Link to post Share on other sites
Aldon 4,826 #11 Posted February 22, 2017 Small Engine Load Cell: https://m.youtube.com/watch?v=KvLMDZimXsI 1 Share this post Link to post Share on other sites
ztnoo 2,297 #13 Posted February 22, 2017 Interesting. That's an old Craftsman table frame that use to be paired up with things like table saws, drill presses, stationary sanders. etc. Looks to either be NOS or restored. 1 Share this post Link to post Share on other sites
953 nut 51,014 #14 Posted February 22, 2017 On a hot day you could load test an engine on one of these, KOOL! 3 Share this post Link to post Share on other sites
Dan Hankins 80 #15 Posted February 23, 2017 Speaking of dynos I have a prototype brand kart dynos I bolt mine to. Even though it's designed for kart engine it works well and I can put a load on it if I want. 1 Share this post Link to post Share on other sites
W9JAB 156 #16 Posted February 23, 2017 Put a mower deck on it and then you'd have something! 1 Share this post Link to post Share on other sites
stevasaurus 22,197 #17 Posted February 23, 2017 That pretty innovative there Tom. Very good idea. 2 Share this post Link to post Share on other sites
joel_400 59 #18 Posted March 14, 2017 Here are some pics of my test stand...I have found it to be accurate within 5-10 percent of actual Kohler dyno info. The biggest reason I wanted to build it was to measure increases or decreases in power/torque and for fine tuning. So far I have had good luck with what I have done. And it was relatively cheap to build. I think my grand total was less than $250 for the whole deal. joel 6 Share this post Link to post Share on other sites
WHX?? 46,403 #19 Posted March 14, 2017 Franken dyno Joel?! ...hey if it works who am I to criticize! Good Idea Tom ....beats lagging it down to the bench top and stealing the gas tank off an ice auger! I was thinking more of a six inch leather belt out the back connected to a trolley connected to a 12" plow.... thers a way to break them in says Mike...worked on a nice little 7 hp I got!!! 1 Share this post Link to post Share on other sites
joel_400 59 #20 Posted March 14, 2017 I have killed a k301 running e85 without even working it. You must figure the rotor I used is roughly 30 to 35 percent of a brake system used to stop a 3000 or so pound car. Then added another caliper to that rotor for twice the clamping, also stabilizes the arm to measure the torque output by placing force on two sides verses one. I would guess I could stop at least twice what I have already. Joel 4 Share this post Link to post Share on other sites
Ed Kennell 35,146 #21 Posted March 14, 2017 Very kool Joel. Can you post details of the torque measuring system. What is the purpose of the starter/gen? Are you measuring RPM , if so, how? Share this post Link to post Share on other sites
joel_400 59 #22 Posted March 14, 2017 I use the starter/generator for its intended purpose. It beats pull starting the engines! As far as the torque measuring system, it's very simple. The engine spins the shaft, the brake actually floats on the shaft and as you apply brake force the brake wants to rotate downward. That's where the fish scale on the end of the arm comes into play. It measures the torque output in lb/ft. However I did slow it down to half speed, therfore I had to make my measuring arm 2ft instead of one. I think this made it safer and more efficient my self though, as it really keeps the heat down when applying the brake. joel 2 Share this post Link to post Share on other sites
WHX?? 46,403 #23 Posted March 14, 2017 The more I study those pics Joel the kooler it becomes... thanks for sharing! Food for homemade thought... could you connect a genny to a motor, put a load on it & measure the wattage and convert to HP/Ft lbs?? On 2/21/2017 at 8:20 PM, Shynon said: I built a kohler for a customer BTW Tom says he has guys walking off the street looking for parts 'cause they think he runs a mower shop! Really funny thing he said he most often has what they need! Think you missed your life's calling Tom! 1 Share this post Link to post Share on other sites
joel_400 59 #24 Posted March 15, 2017 By measuring the torque in lb/ft and using a simple formula with the rpm and torque you can convert to hp. BTW I use my digital timing light to set timing and get rpm readings. joel Share this post Link to post Share on other sites
Ed Kennell 35,146 #25 Posted March 15, 2017 (edited) So your equation for HP= T(ft lb) X N(rpm of dyno) / 5252 correct ? T = load in lbs X arm length in ft Edited March 15, 2017 by Ed Kennell Share this post Link to post Share on other sites