Some friends of mine who used to have a shop building small bore engines, mostly
BMC 'A' Series, had a home made dyno to run their race engines on.
It used a drive shaft and solid rear end with disc brakes. They would apply the
brakes, using a master cylinder with a long lever attached, and some how
measured the relative amount of effort it took.
These guys had engineering backgrounds and always had the fastest car.
Their shop was in an industrial area and noise was not a problem. There's
nothing like the sound of a full race 1275 engine under load at 8,000 rpm in an
enclosed space to wake up the neighbours.
Joe
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