Europa-List Digest Archive

Sun 04/15/18


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 11:53 AM - Question re carb balance tube (jonathanmilbank)
     2. 01:03 PM - Re: Question re carb balance tube (jonathanmilbank)
 
 
 


Message 1


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    Time: 11:53:07 AM PST US
    Subject: Question re carb balance tube
    From: "jonathanmilbank" <jdmilbank@yahoo.co.uk>
    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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    Time: 01:03:45 PM PST US
    Subject: Re: Question re carb balance tube
    From: "jonathanmilbank" <jdmilbank@yahoo.co.uk>
    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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