Quote:
Originally Posted by Ed Wright
A chassis dyno is only a tool for measuring changes on that car, on that day. You can move it off the rollers, then put it back on and tie it down again and often get a couple hp difference, due to tire's alignment with the rollers..
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Very good point, I guess you just take certain things as a "given" but others may not know this.
Years ago on small engines my brother and law, we used a well pump with a captive air tank, hook the engine up and see how long it could it took to make X pressure, if the next run was better we knew we had an improvment, worked good for baseline from a given. No way to rate horsepower but it gave a refrence point, until the tank went farther south that it already was and we scrapped the whole contraption, I have always wanted to rebuild the design with computer refrence to somewhat accuratley measure HP.
It was actually a wonderfull tool, it really helped up peak out the engine we did it for, better than "seat of the pants" which at 75 across a plowed field was a bit dicey on the cart (an Oddesy like buggy)
A "hub" setup for a car , a "home" dyno as it were would be slick.
We had lots of problems getting an accutate measurment with our converter as wel.