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Bill Schlatterer
Joined: 09 Jan 2006
Posts: 195
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 Posted: Sat Apr 07, 2007 1:48 pm Post subject: Carb Fittings? Primer fittings? |
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I need to rotate this 45 degree AN fitting but it is a "little" snug! See picture. Needs to face to the rear. Before I crank it into two pieces, I thought I would ask and see if perhaps the Allen Screw just above the fitting (red arrow) might be locking it in place. I am thinking this is one of the usual carb fittings with an O-Ring that is locked down with the large nut (banjo fitting?) and the 45 degree AN fitting is just clocked 180 degrees from where I need it but it doesn't feel like you can just rotate it an additional 180 without breaking something?
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This looks like one of those things that is easy if you know and hard if you don't! Any help appreciated.
Also, I have primer port fittings from Wix with a small pinhole (brass) and some from the Spruce that are basically 2d AN fittings without any restriction. (Came in the primer solenoid kit) Seems like a lot of difference between the two and one would pass a lot more fuel than the other. Any reason to favor one over the other? See pix, sorry for the quality.
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Thanks
Bill Schlatterer
7a engine/cowl
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rmkeith(at)gwi.net
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| Posted: Sun Apr 08, 2007 4:24 am Post subject: Carb Fittings? Primer fittings? |
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Bill,
The fitting assembly in the picture is made up from two adapters. The first adapter has a crush gasket or O ring seal and is seated into the carb. DON'T turn this fitting. The second fitting is a 45 degree NPT to JIC adapter, this is the fitting that can be turned. Hold the first fitting with one wrench and rotate the JIC portion to the correct direction.
I think that I would opt for the pinhole fittings. When a primer line brakes the small pinhole in the fitting will result in a small induction leak. Also the small pinhole also sprays (injects) fuel into a cylinder with an open valve. I don't think that this is possible with the standard port fittings.
Russ Keith
RV9A 75% done 95% left to go
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Miles Bowen
Joined: 10 Jan 2006
Posts: 14
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| Posted: Mon Apr 09, 2007 8:26 am Post subject: Re: Carb Fittings? Primer fittings? |
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Russ has given some good advice on how to adjust the fitting, but this is definitely NOT the place for a "pinhole" fitting. This is the fuel inlet to the carb, and a "pinhole" fitting would not all allow sufficient fuel flow.
The fitting to which the arrow points is not a setscrew, but a pipe plug, just there to seal the hole, which was probably only there to allow access for machining the part during fabrication.
Miles
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Miles
1955 C170B
HRII Plans#211 |
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