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Old 02-14-2020, 02:05 PM   #1
grafspee
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Default Priming in FW190 A8/D9

What is this feature. i have never used that in both planes.
I don't know about BMW801 but jumo213 is direct fuel injected, so classical priming doesn't make any sense here
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Old 02-14-2020, 02:48 PM   #2
msalama
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Quote:
but jumo213
The D9 has a priming pump regardless. Left console towards the rear. I usually give her about 10 pushes just because.
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Old 02-14-2020, 03:13 PM   #3
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Originally Posted by msalama View Post
The D9 has a priming pump regardless. Left console towards the rear. I usually give her about 10 pushes just because.
Unless priming pump is injecting something different then standard fuel maybe some highly explosive for example mercury fulminate
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Old 02-14-2020, 03:20 PM   #4
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I don't know what it injects into the manifold, but AFAIK the real thing had one as well. Ether?
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Old 02-14-2020, 03:27 PM   #5
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Originally Posted by msalama View Post
I don't know what it injects into the manifold, but AFAIK the real thing had one as well. Ether?
Probably right, something flammable and volatile
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Old 02-16-2020, 08:54 AM   #6
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Maybe it's simply to pressurise the fuel lines?


I'm sure someone more enterprising than myself today could go find the engine manual and have a look...
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Old 02-16-2020, 09:12 AM   #7
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Quote:
Maybe it's simply to pressurise the fuel lines?
IIRC the correct sequence is to switch on the fuel pumps to pressurize the feeder lines first, then push the handpump 10 times in order to inject fuel into the manifold. So I don't think it's that.
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Old 02-16-2020, 09:45 AM   #8
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Well, DB engines were fuel injected as well, but we've got good old priming pump in the 109 too, don't we? There must have been some reason for that.
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Old 02-17-2020, 03:48 PM   #9
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That is what I found in the A8 manual:

https://forums.eagle.ru/attachment.p...1&d=1581957946



I think at the low RPM on start up, the engine driven injector pump just doesn't provide enought fuel or pressure to get the combustion to work correctly.
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Old 02-18-2020, 02:53 AM   #10
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Well that explains it. Thanks for digging this up.
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