stunthanger.com
Engine basics => Engine set up tips => Topic started by: Dave Haught on May 15, 2010, 07:43:25 PM
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My memory is getting weaker by the day, there was an article a few years ago about converting clunk tanks on profiles to uniflow systems, any one remember what to do?
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What I remember (and I'm just a well-read newbie, scale your grain of salt as you see fit) is that you either use two clunks or one clunk and some sort of tie.
Either use two pickups -- one for the pick up, and one for the vent -- and depend on them traveling together. Or tie the vent to the pickup clunk, with solder or a cable tie or whatever, to _insure_ that they travel together (but which also makes an overall stiffer unit).
I used two clunks; seems to work fine.
I'm sure there's all sorts of interesting voodoo having to do with relative length of the lines and all that -- that gets well beyond my experience.
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Simple, bend the breather line so the end is very close to the centre of the outside wall of the tank (which then becomes the "bottom" of the tank in flight) making sure it can't interfere with movement of the clunk feed line. Use a third line bent up to the top of the tank as the breather when filling and blank it securely after the tank is full.
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I hope you have already tlried the search engine on this forum. As there have been some pctures and posts of how to do it. If I wasn't so lazy I would do the search for you. VD~
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I hope you have already tlried the search engine on this forum. As there have been some pctures and posts of how to do it. If I wasn't so lazy I would do the search for you. VD~
Yet a quick search on "uniflow" coughs up no results at all -- not even this thread!!!
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Tim,
Go to the home page of this forum, click on Search, and type in uniflo without quotation marks. I got dozens of hits!
Search will look for parts of words, as well as whole words, so uniflo brings up uniflow and anything containing those letters in sequence.
Bill
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I've been using a Dan Banjok fabricated clunk on a profile. Works very well. Dan wire wraps and solders the breather line to the fuel pickup. Breather line outlet approximately 3/8" forward of fuel pickup. Breather outlet is made of 1/8" copper tube bent in an S. The straight ends are of sufficient length to provide a good solder joint on the pickup side and a tight mount for the flex tubing attached to the front hub tubing. (If I could draw a diagram and upload it, my description would be clearer.) The setup permits the pickup and breather outlet to move together with the clunk. I attach muffler pressure to the breather outlet, my preference. Others allow the breather inlet to hang free in the breeze.