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N6ZY
Joined: 08 Aug 2011
Posts: 31
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 Posted: Thu Jun 20, 2013 10:32 am Post subject: Exhaust Fouling the Cowling |
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I am in the process of fitting the cowling to my 914-equipped XS. The number 1 exhaust pipe seems to be touching the cowling, and may even be pushing it forward. I am sure that I am not the first person to hit this issue. My current thought is to cut the cowling away from where the exhaust pipe is touching it, to fair a blister into the cowl, then wrap the exhaust pipe. In addition the number 1 EGT port is almost touching the cowl.
It may be that the exact engine position relative to the cowl varies slightly with how the engine frame is bolted to the airframe, but the tolerances here do seem very tight.
I would appreciate hearing what everyone else has done if they hit the same problem. Thanks.
Jerry Fisher
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steven.pitt2(at)ntlworld.
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| Posted: Thu Jun 20, 2013 11:37 am Post subject: Exhaust Fouling the Cowling |
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Jerry,
Exactly my experience. Had to cut and reform that part of the cowling and
even then had to add reflective heat resistant tape to the inside of the
cowling to save the exhaust pipe burning through. You don't notice the
larger port bulge from the outside unless you know what you are looking for.
Regards
Steve Pitt
G-SMDH 912S XS trigear
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neveyre(at)aol.com
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| Posted: Thu Jun 20, 2013 11:48 am Post subject: Exhaust Fouling the Cowling |
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Hi Jerry,
Sounds about usual, the EGT probe position can be sorted by moving the bush in the header, Dave, the welder at Europa has a jig to reposition / re weld, talk to Karen.
Easiest way to get additional clearance between the headers and the cowl, is to cut the cowl around the top of the ''eyeball'' holes, and cut down the side of the fairing to allow the eyeball to be pulled [ hinged ] forward. re glass with 4 plies of Bid, and use high temp / fire retardant polyester resin.
Ally foil skinned glass cloth material should be used to keep the heat off the cowl. Even with increased gaps, it will still cook and burn the paint off if you try a WOT ground run for more than a couple of minutes.
Get the cowl as far forward as you can, a 1/8'' gap from the front face to the back of the spinner is JUST enough.
Cheers,
Nev
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