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Most dynos I have used connect with coupling that has a flex plate bolted to the flywheel. The hexl palete allows some parallel and angular misalignment between the driving and driven machines.
You don't really need a clutch as the dyno can be set to zero load at idle.
The type of brake used isn't very important as it only provides the load. The torque measurment system. however. should have a decent resolution and accuracy as should speed measurment.
What will you do about the lube system? I would want to fit my own tank and cooler if you think this is needed.
Clearly you will want to monitor engine temperature and the heat exchangers wont have any air flow unless you have a fan.
Break In Oil, I would use Joe Gibs BR or XP4 they have the same basic formula and are high Zinc.
I also wouldn't let the engine idle at below 3000 rpm for the first 15-20 minutes..
I think fitting a second 02 bung is a good idea.
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