I have a "water brake" dyno that was made by a company called "Go-Power" in the 1970's. Fully equipped with all the bells and whistles and accessories back then, it cost about $5,000.00. I've had engines of a little over 700 HP hooked up to it. A Sun chassis dyno cost a little over $35,000.00 at the same basic point in time.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!