Combustion times and related info
I am interested in the times associated with combustion and the best
crank angle when peak pressure occurs.
Since NASCAR engines turn 9000+ rpm and make best power there, it
seems that the "burn time" must be short. What does the high rpm bike
community think is the best time to initiate the spark? Anyone know
what the NASCAR engine uses for timing?
After the fuel is ignited somewhere before TDC, the pressure builds up
as a result of the piston ascending and the burning taking place.
Is it best to have the peak pressure occur at TDC or somewhat after,
where the rod angle to the crank is better?
I realize this is a very nebulous area, but do you have any guidance?
>Aircraft engines are basically constant speed, constant load devices.I disagree, there are many examples of inexperienced / tired /
>Push it rich for takeoff, throttle back for cruise, lean for the
>correct EGT drop, and you're done for the duration. Other than maybe
>breaking a mixture control cable, there's nothing to screw up.
stressed pilots crashing planes due to wrong mixture settings.
I would suggest that many more are killed by having the
"choice", than ever would be by failed electronics ( With
suitable backup, including dual alternators & 2 smaller
>Magnetos are simpler than a belt/alternator/distributor setup, andElectronic ignitions don't.
>you'd have to have some kind of distributor drive anyway,
>Reliability was the major idea with all of this. You don't just pullYep, I've heard all these arguments. Using this line of argument, how
>over to the side of the air and open the cowl if something quits. And
>there are lots of places - water, forest - that you can't land.
then do you justify using OHV engines in the first place, side-valve
engines work perfectly well, have only 1/3 the moving parts in the
valve train, are physically smaller and lighter.
>Multiple-redundant electronics would be okay, but there are darned fewAt least I agree totally with this paragraph.
>light aircraft that have been designed since the invention of the
>microprocessor, and in the USA that means getting FAA certification,
>which is a hassle, and product liability insurance, which could be
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