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<... Isn't there a law of motor performance that says that two motors putting out the same horsepower are consuming the same amount of air&fuel, assuming efficiency differences were not significant ...>
Yes. But an assumption that efficiency differences are not significant different is *fatally *flawed. The notion that two engines will consume the same amount of air & fuel sort of implies perfection in the delivery of air & fuel. The point of much of this discussion is that the Ellison will deliver sufficient air with sufficient efficiency to a Lyc but will *not* deliver enough air efficiently enough to a 13B to enable the engine to make the power it should. A rotary would perform even worse if you attached a Marvin Dribbler carburetor to it.
EFI is the way to go ... even if electronics and computers spook us ... Jim S.
Tom wrote:
I'm under the impression I have an answer.
Isn't there a law of motor performance that says that two motors putting out the same horsepower are consuming the same amount of air&fuel, assuming efficiency differences were not significant?
So if you had a 13b and a O-360 putting out the same horsepower for a single given 1 revolution of the propeller, they should be consuming the same amount of air and fuel during that 1 propeller revolution. (I THINK chosing 1 propeller rpm is a correct standard)
Bill pointed out that the 13b operates at a higher rpm, and we know that there's more combustion charges consumed by the 13b to make that 1 prop rpm. The difference, the missing piece, each 13b combustion charge consumes a SMALLER amount of fuel/air than the piston powerplants less frequent combustion charge. ??? So the 13b burns a smaller amount more frequently. ???
If this is all true, then the Ellison isn't on the trash heap yet.
Tom
*/WRJJRS@aol.com/* wrote:
Group,
I want to remind everyone about how much a priority the large
volume inlets are to us. I believe Ed Anderson was mentioning in
one of his posts how difficult it can be to get a MAP signal in
the airbox of one of our PP engines. This is a perfect indication
of why the smaller throttle bodies used on some of the slow
turning engines will kill our HP.
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