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So, the parts from Summit Racing will be here tomorrow, and I have a beautiful 45* flare tool, lots of fittings and lots of aluminum tube.
AAARGH! What was I saying!! It's bad enough to have a slip of the tongue...but a slip of typing!? I'm going to go home and measure the thing anyway before I go any further.
Yes, smart thing to do. The 45deg automobile flare tools are cheap, the 37 degree aircraft AN flare tools are a bit more expensive.
I've heard two stories about how the AN (Army Navy) specification came about. One was that during WWII a lot of cheap, poorly made fittings were resulting in accidents/malfunctions - so the Army/Navy decided to change the fitting from 45 to 37 deg so that only those firms with valid production contracts (for fittings) would go to the expense of retooling.
The second (perhaps more plausible) reason was that the 37deg flare puts less stress on the metal than the 45 deg flare resulting in fewer failures. But, in any case if you use AN then you must use the 37 deg tool. Double flare 37 deg tools are even better for small tubing - but very expensive.
Ed A
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