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914 Smooth running

 
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erichdtrombley(at)juno.co
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PostPosted: Sun Feb 26, 2006 8:47 pm    Post subject: 914 Smooth running Reply with quote

Patrick writes
"I am really learning about fuel pumps and pressures etc (I think) and wonder
if anyone can comment on the problem I have with getting a smooth running
engine at RPM below about 3600 on my 914. Could it be overmuch fuel pressure

and carb flooding with both pumps on in my parallel system?"
Patrick, having recently attended a class on the 914 I would suggest pneumatically balancing the carbs. This has the single greatest impact on a smooth running engine. Also, remember the fuel pressure at the carbs is a function of airbox pressure and is set by the fuel pressure regulator, therefore, having the pumps in parallel would not cause flooding. I have been using the parallel system on my 914 for the last three years without issue. Almost all the 300 hours have been at or above 12,500 ft MSL.
Erich Trombley

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Patrick writes


"I am really learning about fuel pumps and pressures etc (I think) and wonder
if anyone can comment on the problem I have with getting a smooth running
engine at RPM below about 3600 on my 914. Could it be overmuch fuel pressure

and carb flooding with both pumps on in my parallel system?"


Patrick, having recently attended a class on the 914 I would suggest pneumatically balancing the carbs. This has the single greatest impact on a smooth running engine. Also, remember the fuel pressure at the carbs is a function of airbox pressure andis set by the fuel pressure regulator, therefore, having the pumps in parallel would not cause flooding. I have been using the parallel system on my 914 for the last three years without issue. Almost allthe 300 hourshave been at or above 12,500 ft MSL.


ErichTrombley

Try Juno Platinum for Free! Then, only $9.95/month!


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BEBERRY(at)aol.com
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PostPosted: Mon Feb 27, 2006 12:41 am    Post subject: 914 Smooth running Reply with quote

Thanks Erich,

I have once pneumatically balanced the carbs (bought the kit from Conair)
and this appeared to make no difference. Am now awaiting return of unbalanced
from before I can try again/

Thanks for the advice.

Patrick


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