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From: bob mackey <n103md@yahoo.com>
Subject: RE: [LML] Re: Boost pump switching
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All this talk of high boost, low boost no boost; flooding, sputtering, and quitting....

It makes me wonder why the Continental IO-550 is so sensitive to 
to incoming fuel pressure. If changing the fuel pressure in the lines
causes the fuel mixture in the engine to change drastically, it seems
to me to be a defective design. Shouldn't there be a pressure regulator 
in the system somewhere so that as long as enough fuel is delivered
to the engine, it runs at the same fuel:air ratio?

Are all Lycosaurus injected engines this sensitive to fuel pressure?

My carbureted O-320 engine also flows about 20% more fuel when 
the boost pump is operating. Seems like a properly operating 
float bowl shouldn't allow that. 

Any of the aircraft engine specialists care to explain why a pressure 
regulator isn't part of the system?

-bob


 		
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All this talk of high boost, low boost no boost; flooding, sputtering, and quitting....<br><br>It makes me wonder why the Continental IO-550 is so sensitive to <br>to incoming fuel pressure. If changing the fuel pressure in the lines<br>causes the fuel mixture in the engine to change drastically, it seems<br>to me to be a defective design. Shouldn't there be a pressure regulator <br>in the system somewhere so that as long as enough fuel is delivered<br>to the engine, it runs at the same fuel:air ratio?<br><br>Are all Lycosaurus injected engines this sensitive to fuel pressure?<br><br>My carbureted O-320 engine also flows about 20% more fuel when <br>the boost pump is operating. Seems like a properly operating <br>float bowl shouldn't allow that. <br><br>Any of the aircraft engine specialists care to explain why a pressure <br>regulator isn't part of the system?<br><br>-bob<br><br><p>&#32;
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