Fuel Injection Systems
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Arnold E
BMEP exists in both engines.
Brake Mean Effective Pressure (BMEP) is another very effective yardstick for comparing the performance of one engine to another, and for evaluating the reasonableness of performance claims or requirements.
The definition of BMEP is: the average (mean) pressure which, if imposed on the pistons uniformly from the top to the bottom of each power stroke, would produce the measured (brake) power output.
Note that BMEP is purely theoretical and has nothing to do with actual cylinder pressures. It is simply an effective comparison tool.
If you work through the arithmetic, you find that BMEP is simply a multiple of the torque per cubic inch of displacement.
This explanation from EPI, Inc. Engine and Drive System Technology and Components for Aircraft, Automotive, Marine and Industrial Applications.
All about Orlando engine development
Blackhand
Brake Mean Effective Pressure (BMEP) is another very effective yardstick for comparing the performance of one engine to another, and for evaluating the reasonableness of performance claims or requirements.
The definition of BMEP is: the average (mean) pressure which, if imposed on the pistons uniformly from the top to the bottom of each power stroke, would produce the measured (brake) power output.
Note that BMEP is purely theoretical and has nothing to do with actual cylinder pressures. It is simply an effective comparison tool.
If you work through the arithmetic, you find that BMEP is simply a multiple of the torque per cubic inch of displacement.
This explanation from EPI, Inc. Engine and Drive System Technology and Components for Aircraft, Automotive, Marine and Industrial Applications.
All about Orlando engine development
Blackhand
Last edited by blackhand; 20th Mar 2009 at 05:42. Reason: more info
blackhand (sorry not glackhand, finger trouble)
Ya got me on that one, but I still ask, if all these engines are you "beaut" why arn't there thousands of them in aircraft flying around the world. I am not against advancement, if fact I was more than likely the first person in Oz to buy, and take delivery, of a FADEC Lycoming engine, but the fact is,THEY DONT WORK. Lyc's and Contys work and are reliable for high power over a long time in aircraft and nothing else is. Convince me otherwise
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Arnold E
Hey Arnold
You misunderstand my intent., I am in the OEM camp myself.
I am not convinced that de-rated high performance automotive engines can be used in aircraft application.
Lycs and continentals are designed for slow revving, high BMEP applications - sounds like most of the fixed wing I've worked on.
When I read the info on the EPI site in my last post it became self explanatory why these automotive engines were not working out in aircraft application.
And from the mechanic's point of view, I would rather pull one cylinder for a valve or ring set repair/replace than take a head off and drop the sump to do the same.
Blackhand
You misunderstand my intent., I am in the OEM camp myself.
I am not convinced that de-rated high performance automotive engines can be used in aircraft application.
Lycs and continentals are designed for slow revving, high BMEP applications - sounds like most of the fixed wing I've worked on.
When I read the info on the EPI site in my last post it became self explanatory why these automotive engines were not working out in aircraft application.
And from the mechanic's point of view, I would rather pull one cylinder for a valve or ring set repair/replace than take a head off and drop the sump to do the same.
Blackhand
