Bill,
We use a leakdown tester to set the barrel valve on the injector. This way
you are able to return to a previous setting after maintenance.
Jim in Palmdale
----- Original Message -----
From: Bill Bennett <benettw@earthlink.net>
To: Joe Timney <joetimney@dol.net>
Cc: <land-speed@autox.team.net>
Sent: Monday, August 28, 2000 5:32 PM
Subject: Re: Leak Down Tester
> Joe help me out here I kinda remember seeing someone who ran a Top
> Alcohol Funny Car use a leak down tester on his fuel injector system.
> What was this for and what was he doing?
> Bill Bennett
> ----- Original Message -----
> From: "Joe Timney" <joetimney@dol.net>
> To: <V4GR@aol.com>
> Cc: <BICWIG@aol.com>; <kturk@ala.net>; <land-speed@autox.team.net>
> Sent: Monday, August 28, 2000 2:38 PM
> Subject: Re: Leak Down Tester
>
>
> > What you are looking for is the delta between the two gauges.
> Setting the first
> > gauge at 100 psi allows you to simply read the second gauge as a
> percent.
> > Example, If the first gauge reads 100 # and the second gauge reads
> 96 #, then
> > the leakdown is 4 %. If you only have say 80 lbs. of air from your
> compressor,
> > you will have to do some math to arrive at a percentage of loss. I
> have found
> > that a motor with gap-less rings will show 0 to 1 % leakdown if in
> good working
> > order. 4 to 6 % is not too bad. The motor needs work if you see over
> that. I
> > have tested motors with the piston in various postions in the bore
> looking for
> > scarring or bore scratches. I have had a fuel motor on more than
> one occasion
> > show good on the leakdown but the piston was melted down around the
> rings.
> >
> > joe
> >
> > V4GR@aol.com wrote:
> >
> > > Keith; I don't know why but when I was going to A&P school we
> learned to set
> > > the gages at 80 lbs. Then we compared the reading on the
> downstream gage
> > > after opening the air valve. I seem to remember 20% for a worn
> cylinder cold
> > > was acceptable. More than that was not. Race motors should be much
> tighter.
> > > After the first few years at the airline we put away our leakdown
> testers.
> > > Couldn't get them to read correctly on a JT3. Rich
> >
> >
> >
>
>
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