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Doug.Zeissner(at)rdmd.ocg
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 Posted: Tue Aug 12, 2008 6:43 am Post subject: Rough running engine |
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Blitz- Your situation with your engine running rough could be a suction side leak in your fuel system. I fought similar symptoms for about a year
until it was figured out. I would fly for +/- 45 min and then my engine would start running rough. Over time the problem got worse.. to the point that
it would stop running for a second then start again. I would suspect that you are on the verge of getting to that point. My suction side leak ended up being through the
wobble pump and the fitting into the pump- which has a straight fitting and a fiber gasket that can dry up. The hotter and higher I flew the more the problem manifested itself.
The problem with a leak on the suction side is that you may not have a fuel stain to help track down the location because it will suck in air but not leak fuel.
I went through the whole litany of checking and tearing down mags. When the mixture gets too lean it can mimic a mag problem by giving you large
Mag drops from the excessive lean mixture. Don’t let it go because when it decides to start sucking more air it WILL scare the shit out of you!
[b]Doug Zeissner[/b]
714 264-1019
email: doug.zeissner(at)rdmd.ocgov.com
[quote][b]
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ByronMFox(at)aol.com
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| Posted: Tue Aug 12, 2008 7:22 am Post subject: Rough running engine |
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Thanks for the heads-up, Doug. Good advice!! ...Blitz
In a message dated 8/12/08 7:44:43 AM, Doug.Zeissner(at)rdmd.ocgov.com writes:
| Quote: |
Blitz- Your situation with your engine running rough could be a suction side leak in your fuel system. I fought similar symptoms for about a year
until it was figured out. I would fly for +/- 45 min and then my engine would start running rough. Over time the problem got worse.. to the point that
it would stop running for a second then start again. I would suspect that you are on the verge of getting to that point. My suction side leak ended up being through the
wobble pump and the fitting into the pump- which has a straight fitting and a fiber gasket that can dry up. The hotter and higher I flew the more the problem manifested itself.
The problem with a leak on the suction side is that you may not have a fuel stain to help track down the location because it will suck in air but not leak fuel.
I went through the whole litany of checking and tearing down mags. When the mixture gets too lean it can mimic a mag problem by giving you large
Mag drops from the excessive lean mixture. Don’t let it go because when it decides to start sucking more air it WILL scare the shit out of you!
Doug Zeissner
714 264-1019
email: doug.zeissner(at)rdmd.ocgov.com
|
**************
Looking for a car that's sporty, fun and fits in your budget? Read reviews on AOL Autos.
(http://autos.aol.com/cars-BMW-128-2008/expert-review?ncid=aolaut00050000000017 ) [quote][b]
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kurt(at)scitechsys.com
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| Posted: Tue Aug 12, 2008 7:47 am Post subject: Rough running engine |
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A couple of weeks ago, I heard Vladmir speak. He advocated replacing the
wobble pump with an electric pump
(http://www.aircraftspruce.com/catalog/eppages/facetpumps.php). Probably
won't help in this case, but it's something to think about while you're
working on the wobble pump.
--
Kurt Howerton
N923YK
http://cj6.scitechsys.com
ByronMFox(at)aol.com wrote:
| Quote: | Thanks for the heads-up, Doug. Good advice!! ...Blitz
In a message dated 8/12/08 7:44:43 AM, Doug.Zeissner(at)rdmd.ocgov.com writes:
>
> Blitz- Your situation with your engine running rough could be a
> suction side leak in your fuel system. I fought similar symptoms for
> about a year
> until it was figured out. I would fly for +/- 45 min and then my
> engine would start running rough. Over time the problem got worse.. to
> the point that
> it would stop running for a second then start again. I would suspect
> that you are on the verge of getting to that point. My suction side
> leak ended up being through the
> wobble pump and the fitting into the pump- which has a straight
> fitting and a fiber gasket that can dry up. The hotter and higher I
> flew the more the problem manifested itself.
> The problem with a leak on the suction side is that you may not have a
> fuel stain to help track down the location because it will suck in air
> but not leak fuel.
> I went through the whole litany of checking and tearing down mags.
> When the mixture gets too lean it can mimic a mag problem by giving
> you large
> Mag drops from the excessive lean mixture. Don’t let it go because
> when it decides to start sucking more air it WILL scare the shit out
> of you!
>
>
> /* Doug Zeissner*/
> 714 264-1019
> email: doug.zeissner(at)rdmd.ocgov.com
>
**************
Looking for a car that's sporty, fun and fits in your budget? Read
reviews on AOL Autos.
(http://autos.aol.com/cars-BMW-128-2008/expert-review?ncid=aolaut00050000000017
)
*
*
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viperdoc(at)mindspring.co
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| Posted: Tue Aug 12, 2008 10:22 am Post subject: Rough running engine |
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So with the PN 40164 24v Facet automotive fuel pump we can eliminate the Primer pump and have a backup for loss of the shaft drive fuel pump? It will be pumping 30 gph directly into the supercharger though assuming the 24v model is used. How's that going to work? Anybody out there ops tested this theory yet? I'm showing my ignorance of this one.
As for MMO, its fineto in my oil. The YAK engines ran on Benzene based fuels before they got here so that is probably why they seemed to like it. At least mine did that is.
--
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