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Re: Finding carb vacuum leaks with propane torch

To: "INTERNET:ZinkZ10C@aol.com" <ZinkZ10C@aol.com>
Subject: Re: Finding carb vacuum leaks with propane torch
From: Dave Massey <105671.471@compuserve.com>
Date: Thu, 20 May 2004 08:16:16 -0400
Cc: triumphs@autox.team.net, warren-allen@triad.rr.com i4KCJN8K029370
Message text written by INTERNET:ZinkZ10C@aol.com
>Actually you would remove the tip then use a hose.  ( propane mixed with
air 
would not work too well )

The problem with this method is propane can enter the distributor cap and
go 
boom. 
<

Which is shy you leave the tip on.  The tip will mix the propane with the
right amount of air.  As long as you don't poke it right at the
distributor, by the time the propane finds its way over there the mix will
be diluted enough with air so as to be below the LEL (lower explosion
limit) and will not support combustion.  But when you hold the tip very
close to the vacuum leak the air leaking in will be replaced with a more
burnable air/propane mix and a quick rise in RPM will be noted.  The other
nice thing is the RPM's will quickly drop  as soon as you move away from
the leak.  Spraying flamable liquids (starter fluid, carb cleaner) will
leave a small puddle of liquid and you will have to wait for the residue to
boil off and disipate before the RPM's drop.

Dave





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