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rparigoris
Joined: 24 Nov 2009
Posts: 792
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 Posted: Tue Jul 28, 2020 4:12 pm Post subject: 914 Fuel Pressure Regulator plumbing question |
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Hi Group Does anyone by chance know at 40" MP on a 914 how much more Ram Air is compared to Airbox pressure? My reason for asking is I think the pneumatic connection to Fuel Pressure Regulator might want to be plumbed to the output of enrichment solenoid as compared to the airbox. I think what we really want is more fuel pressure going into carbs compared to pressure on the float bowls, not airbox pressure. For most part it's the same except when the enrichment solenoid is activated. I'm installing a UMA Differential sender at the moment and they what the pneumatic connection reading carb float bowl pressure, not airbox pressure. It may be there is so little difference that airbox pressure is adequate, or not? Ron P.
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Remi Guerner
Joined: 14 Dec 2010
Posts: 284
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| Posted: Wed Jul 29, 2020 3:56 am Post subject: Re: 914 Fuel Pressure Regulator plumbing question |
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<<<<Does anyone by chance know at 40" MP on a 914 how much more Ram Air is compared to Airbox pressure? >>>>>
Hi Ron,
Years ago, when I was messing with the 914, I did some calculation about that.
I found that ram air pressure was 1.4 percent over static pressure inside the airbox. This is a very small pressure increase: .025 PSI. This is enough to enriched the mixture significantly, but this nothing compared to the differential fuel pressure which is in the 2 to 6 psi range. Therefore plumbing the Fuel Pressure regulator to the enrichment valve instead of the airbox static pressure would not change anything.
Remi
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