Shortround6
Major General
Thank you .
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If the supercharger is included as part of the engine I would have to give ot to the Brits. Imho the Merlin and Griffin seemed like they were one step ahead of anything else throughout the war.
Yes 10-4. I just meant as a package I felt the British engines were the best of the war as oposed to if were talking with equivalent superchargers a case could be made that some other engines were as good or perhaps even a bit better.I would hope so - they didn't have much performance without the supercharger!
All major engine types for combat aircraft in the war had an integral supercharger.
I think it was the end of the era where individuals made a huge difference, the whole of the supercharger/turbo charger/jet engine world was driven by just a few people world wide.That darn Stanley Hooker has a lot anwer for, knocking the US engines into 2nd place
Isnt that where the phrase "engine tuner" originated from, from when harmonics was involved, in some cases you can hear a tuned engine go "on cam".there is a relatively simply formula (that escapes me at the moment) for figuring out the needed intake length for a raming manifold but it has to do with the speed of sound and the rpm of the engine (divided by 2?) at any rate to get ramming effects for a low rpm engine you get things like the old Chrysler manifolds.
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I believe there were two different lengths depending on the RPM band that was desired. The shorter one worked closer to 6000rpm?
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But this is for a naturally aspirated engine. I don't know what happens in a supercharged engine.
BTW the length of the intake path is from the mouth of the carburetor (or velocity stack) to the intake valve.
Isnt that where the phrase "engine tuner" originated from, from when harmonics was involved, in some cases you can hear a tuned engine go "on cam".
If you do NOT have equal length for each runner your cylinders will all be running at totally different mixture strengths because the resonance effects will give you very different volumetric efficiencies..
It does, for all sorts of reasons, there is a whole science built around it.Why would intake manifold length,
.....or design shape matter in an engine that was force fed boost?
It does, for all sorts of reasons, there is a whole science built around it.
Just from reading various posts on here by very learned posters. There are all sorts of issues from the mixing and temperature/pressure of the charge to the actual flow. Don't forget that even with a two stage supercharger as you approach maximum altitude the engine trends towards working at atmospheric pressure anyway.Thanks,
Any links or source information? .....I need to understand this better.
The Merlin had an aftercooler and flame traps that were surely restrictive to airflow, the Allison didn't, which make me think there wasn't as much boost pressure loss.
I don't see how this had anything to do with tuned length. Can somebody explain this to me in layman's terms?
(I fully understand the need on a naturally aspirated engine).
In a nutshell: the longer the intake, the better the air/fuel mixture and distribution, which results in better peak horsepower under load.
The automotive industry is working on a technology called "Variable Length Intake Manifold" (VLIM) to take advantage of that.
Why would intake manifold length,
.....or design shape matter in an engine that was force fed boost?