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Originally Posted by swiss
Great, we finally agree.  |
Yeah.
Quote:
Originally Posted by swiss
But I still dont get Turbo->SC.
It says they used an additional turbo, but nowhere a modified charger, which they probably had to, since it had to deal with altered pressure.
Also, I thought SC work with lower pressure compared to turbos.
Plus, the SC is fed with (still)hot air and heats its up again.
I have some doubts concerning efficiency, what is the SC's purpose? Reduce IC lag?
I guess I'll have to do some research.
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I am guessing it has something to do along the lines what Azimech wrote:
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Originally Posted by Azimech
... It seems they had it right to keep the supercharger attached to the engine, since the turbo takes load of from it, decreasing the load on the engine to drive the supercharger, and being able to boost even more. It was probably even coupled with the barometric device that regulated the variable hydraulic clutch. Anyway I would've chosen that spot due to the CoG.
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On the second thought...
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Originally Posted by koivis
Well, actually it was a similar system to Fw 190C. As far as I know, every P&W R-2800 made also had an internal supercharger mounted directly behind the engine, driven by the crankshaft. The confusing thing here is, that while the air from turbocharger went indeed to the carburetor, from there it continued to the supercharger! After that, it's of course going to cylinders.
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Now that makes no sense. A supercharger compressing a mixture of air and fuel?! What was the compression ratio inside the cylinders then (ε)?
Unless... Doh! But of course. I am 90% sure this is a
Pressure Carburetor since allied engines didn't have fuel injection. So you could say this was a form of fuel injection - to prevent negative G cutouts. Or at least has something to do with how Pressure Carburetor functions.
Question here is - is Fw-190C using proper mechanical fuel injection or a Pressure Carburetor as well?
Quote:
Originally Posted by koivis
Rolls Royce Merlin had almost the same setup (I think most WW2 engines did), except it had an liquid cooled intercooler as the last thing before the intake. Also of note here (two stage version) is that the air is cooled between the stages too!
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As it should be, or else you risk injecting too hot air inside the cylinder. Merlins had to have a mechanically driven SC because their exhaust was - almost non-existent.
A very interesting thread if I may say so!
