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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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 Posted: Sun Oct 12, 2008 4:45 pm Post subject: carburetor mounting |
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I had a thought today, while warming up the mighty Cuyuna engine on my
UltraStar... especially at idle, seems the carburetor is jumping all over
the place. Not surprising, with the carb sticking out from the side of the
engine on its rubber boot, and the air filter sticking out even
farther. Seems all that shaking can't be doing the carb or the rubber boot
any good, and a simple brace to the engine mount tubes on top of the engine
would steady it... or it might transmit even more vibration to the
carb? Perhaps a support strut with its own rubber isolator, so it'd
prevent the large deflections at lower rpm but still isolate the higher
frequency motion? Thoughts, anyone?
-Dana
--
Lottery: a tax on the mathematically challenged.
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Mon Oct 13, 2008 5:44 am Post subject: Re: carburetor mounting |
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| Dana wrote: | I had a thought today, while warming up the mighty Cuyuna engine on my
UltraStar... especially at idle, seems the carburetor is jumping all over
the place. Not surprising, with the carb sticking out from the side of the
engine on its rubber boot, and the air filter sticking out even
farther. Seems all that shaking can't be doing the carb or the rubber boot
any good, and a simple brace to the engine mount tubes on top of the engine
would steady it... or it might transmit even more vibration to the
carb? Perhaps a support strut with its own rubber isolator, so it'd
prevent the large deflections at lower rpm but still isolate the higher
frequency motion? Thoughts, anyone?
-Dana
--
Lottery: a tax on the mathematically challenged. |
I tried something similar years ago on my first rotax, a 503 single carb.....
Er, I'd recommend leaving it as-is, do NOT try to brace the carburettor in any way..............
The flexing is normal and is already the best solution. Note that, as the engine goes up above idle, the vibrations become much smaller. At flight RPM's everything is nice and still with only a high frequency buzz.....
LS
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LS
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