Then he said the most thought changing thing to me I'd heard up to that time, and for many years to come. He said a dyno will not measure an engines ability to rev. I about fell over. A conventional dyno that uses a water brake won't measure the ability to rev. This is because we set the sweep rate and the dyno controls how the engine accelerates ex(300rpm/sec). And that's a big deal.It is a big deal but I will often perform tests @ faster sweep rates (400 rpm/sec and 600 rpm/sec) If the output is same or increases then I know the engine will be a good performer, relatively speaking. Also, I learned later that BSFC is an important number and that accounts for some of why two engines with the same power can have incredibly different ET's.BSFC is a very good indicator of effeciency-obviously 2 engines (same displacement) making the same power, the 1 that uses the least amount of fuel to do it will be better--but then again this should show in the averages.
You have to be able to measure the ability to rev. A chassis dyno does this. You can learn a lot, if you have a dyno operator who knows what he is doing.
BTW, at one time Mike Laws built a dyno that was an inertia dyno for engines. I think they are still being made. Almost had one. This dyno system I believe is the Cat's ***, I win the lottery I will be getting one or having one made. But a crook and shyster came along and went down a rabbit hole. You know who you are if you are reading this. PM me if you have the hair on your ***.
Ok , back to the regularly scheduled fun and games.
