Today's Message Index:
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1. 11:53 AM - Question re carb balance tube (jonathanmilbank)
2. 01:03 PM - Re: Question re carb balance tube (jonathanmilbank)
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Subject: | Question re carb balance tube |
Perhaps Bud would be kind enough to give a definitive answer to this, but anyone
else who has certain knowledge regarding this topic might also be willing to
enlighten me. A friend who also has a Europa sent me some links, as follows:
https://www.rotax-owner.com/en/rotax-forum/4-general-discussion/4509-balance-tube
www.zenith.aero/forum/topics/flygas-intake-manifold
https://www.flygas.info/2017/06/18/311/
My friend believes that the earliest Rotax 912 engines had no carburettor crossover
balance tubes and ran roughly, particularly at low speed. The solution was
the balance tube, but perhaps Rotax tried out the diameter of tube we all know
and found that it did a good enough job of smoothing things out, whereas they
could have got a better result if they'd experimented with larger diameters.
Who knows?
Anyhow I'm not rushing to buy the Italian mod kit costing 700+ because it's not
approved by the UK LAA and any unapproved modification fitted to aircraft in
this country renders aircraft insurance invalid.
Thanks in anticipation.
Jonathan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479342#479342
Message 2
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Subject: | Re: Question re carb balance tube |
Ploucandco
"2. an engine is vibrating and you are hard linking the 2 manifolds!"
I'm with you on everything else, except your point 2. above, because the two manifolds
are already hard linked by being bolted solidly to their respective cylinder
heads. The flygas solution doesn't link them any more solidly than they
already are, but I take your point about unnecessary extra weight.
My experience of 3 different Rotax 912 engines which were expertly carb and propeller
balanced is that they all exhibited a little vibration at some rpm a bit
above 3000.
Thanks for your swift reply.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479344#479344
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