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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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 Posted: Thu Jul 14, 2011 1:52 pm Post subject: Balance Tube |
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I'm putting my 912 into the Kitfox and am asking myself why I need the
balance tube between the intake manifolds. I don't remember any auto
application having one, and we balance the carbs anyway. Does anyone
have a mechanical reason for maintaining this connection?
Thanks,
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 592-C / Warp 3cs / 500 hrs. and grounded
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Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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rampil
Joined: 04 May 2007
Posts: 870
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| Posted: Thu Jul 14, 2011 2:44 pm Post subject: Re: Balance Tube |
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Hi Guy,
The simple answer is "Death from vibration-induced engine failure".
Unbalanced engines vibrate excessively.
Automotive engines are substantially more more solidly reinforced since
there is a much smaller weight penalty.
Do what the factory says if you want to add many more hours!
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Thu Jul 14, 2011 3:42 pm Post subject: Re: Balance Tube |
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Guy,
Start the engine once without the balance tube, and you will know why it is needed. Even an engine with perfectly synchronized/balanced carbs will be pretty rough at idle without the tube, as you will see if you try it.
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Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Thu Jul 14, 2011 4:07 pm Post subject: Re: Balance Tube |
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Hi Guy,
These guys are right. Even if you sync the carbs they will slowly get unbalanced and at different rpms they may be off slightly. having that tube makes these small corrections and it is an absolute necessity.
When they get unbalanced and without a balance tube you might have one side of the engine trying to run at 5000 rpm and the other at 5550-5100 rpm.
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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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