False.
An increase in piston speed (swept feet per second/minute) will correlate 1:1 with the volume of air entering the crankcase until the RPMs reach a point where the port can no longer flow enough air to keep up with the demand. Beyond that RPM point the peak crankcase pressures after compression will be in decline, due to incomplete filling.
Remember, all pressure levels inside the crankcase are characterized and dependent upon the atmospheric pressure level available outside. You'd need to add a blower (increase pressure) if you want a small port to flow more air above that limiting RPM point.
Ya, I caught that after I had already posted. Sorry about that. But the same principle applies to the pump diaphragm as it does ports. At no point will internal pressure on the diaphragm rise as RPMs limits are exceeded. It will fall, because of incomplete filling of the crankcase, causing the pulse signal to decay.
I agree with what you're saying and it's a good point, as well as the post about crank case filling.
However, it doesn't relate to the point I was evidently failing to make.
I meant the result of higher rpm/more pulses per minute would be higher volume of fuel pumped and/or higher fuel pressure, not an increase of the actual force applied by the impulse to the diaphragm.
Although, while we're on the subject..., it would seem that WOT would potentially tend to cause the least amount of vacuum in the cc and therefore result in a stronger pulse...
As long as 'RPM limits are not exceeded', whatever that entails...
Mine too, I feel as though I’ve created a monster...lol! But, still interestingThis thread hurts my little brain.
A 2 stroke Detroit diesel does not use atmospheric pressure to fill the cylinders - it uses a blower. The energy required to power the blower comes the energy stored in the diesel fuel, and released upon ignition/combustion.You'd find it impossible to operate a chainsaw motor outside of earths atmosphere no matter how much air and fuel you provided, due to the lack of an existing, sufficient pressure.
So, what would happen if you brought along a positive displacement blower and installed it on a chainsaw motor (in an effort to replace your missing atmospheric force) in deep space?
Nothing. The device would require more input power to function than it would output.
Case in point...if you set the metering lever too high it supplies more fuel than the engine needs at idle causing spit back and it won’t idle. But, if you can get past idle to WOT throttle it will typically clear up and tune properly at max rpm. Something to chew on
2 stroke diesel???