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Old 23-12-2017, 10:33   #31
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Re: Diesel engine "compressor", what is it?

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Originally Posted by a64pilot View Post
Turbo lag isnít the issue, the issue is that the turbo wonít begin to make significant boost until X RPM, and you canít get to X RPM until after you get onto plane, but need the extra HP to get there.
Classic example of being behind the power curve.
A supercharger gives you power now, boost is there, always.
Iím surprised at the complexity of a compound engine though, especially if the Supercharger actually disconnects.
The advantage of a Turbo is itís more efficient, it uses ďfreeĒ energy from the exhaust, where a Supercharger steals crankshaft power and therefore is less efficient, however the decrease in efficiency isnít all that much and isnít worth the complexity of a compound engine in my opinion.
I have never seen a blower that is disconnected, I didnít think that was possible, they are positive displacement pumps, if it doesnít spin, air doesnít go through it, so there must be an alternate air path too?
Unless itís a centrifugal blower?
I'm going from memory here, but if memory serves, yes there is a bypass when the blower (double rotor, twin lobed, Roots style) disconnects.

You think that's complicated, how bout this:





4 turbos, 2 blowers, 149 cu in per cylinder, rated 1600 hp continuous duty. An indication of how highly tuned these dinosaurs are, the cylinder under the black exhaust manifolds is the oil cooler...
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Old 23-12-2017, 11:54   #32
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Re: Diesel engine "compressor", what is it?

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Originally Posted by newhaul View Post
zee that was solved with 12v refrigeration compressors.
guess what... mighta been solved but there are still some that have not been yet changed out. and others with different priorities.
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