perf-list-digest Sunday, February 28 1999 Volume 02 : Number 052



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Ford Truck Enthusiasts - Performance
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In this issue:

FTE Perf - Leak down testers
Re: FTE Perf - Leak down testers
FTE Perf - Intake advice

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Date: Sat, 27 Feb 1999 13:03:53 -0600
From: Phil DeSanto
Subject: FTE Perf - Leak down testers

>>
>>Date: Fri, 26 Feb 99
>>From: don neomagic.com (Donald Paauw)
>>Subject: Leak down tester??
>
>>What exactly is a leak-down tester? How does it work and how is it
>used?
>>- -- Don


Sorry if this is late...I get Digest only.

Don, in simplest terms, it's a tool with two air pressure gauges that
hooks up your air compressor to a given cylinder to see what that
cylinders "leakage rate" is. The first gauge is regulated at 100 psi.
(representing 100%) The second gauge only see's what the cylinder can
hold. So anything less than 100 psi is the percentage (%) of leakage.
If it holds a steady 85 psi then it has a "leakage rate" of 15 %, and so
on.) The great thing about using these is you can actually hear where the
escaping air AND your efficiency is going. You can listen at the throttle
plates for an intake valve, the exhaust pipe for an exhaust valve, and
the valve cover oil fill hole for piston and or ring blow-by. It's a
great diagnostic tool for a lot of engine problems that won't show up on
most guys "at home" equipment.
I think some auto parts stores will rent them, or you can make your own
with the right regulator a couple of tee's, gauges & quick couplers. You
also need the spark plug hole adapter from your compression tester OR
make some from a couple of different type plugs (from whatever your
doing), with the porcelain guts knocked out.

Hope this helps, Phil 64 F-100 ( world's oldest garage project )


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Date: Sat, 27 Feb 1999 20:03:49 -0500
From: Tim Turner
Subject: Re: FTE Perf - Leak down testers

Phil DeSanto wrote:
>
> >>

> >>What exactly is a leak-down tester? How does it work and how is it
> >used?
> >>- -- Don
>
> Sorry if this is late...I get Digest only.
>
> Don, in simplest terms, it's a tool with two air pressure gauges that
> hooks up your air compressor to a given cylinder to see what that
> cylinders "leakage rate" is. The first gauge is regulated at 100 psi.
> (representing 100%) The second gauge only see's what the cylinder can
> hold. So anything less than 100 psi is the percentage (%) of leakage.

I might add that this is part of the testing that small aircraft go
through periodically during the air worthiness inspections. Often
you'll see a set of numbers on the rocker covers like 60/85 or 85/100
denoting what the result and pressures were at the last check. I forget
what the failure limit is (25-35%)? As I recall sometimes testing at a
lower pressure can result in a pass, so as with cars/trucks it helps to
look for a friendly tech!

> If it holds a steady 85 psi then it has a "leakage rate" of 15 %, and so
> on.) The great thing about using these is you can actually hear where the
> escaping air AND your efficiency is going. You can listen at the throttle
> plates for an intake valve, the exhaust pipe for an exhaust valve, and
> the valve cover oil fill hole for piston and or ring blow-by. It's a
> great diagnostic tool for a lot of engine problems that won't show up on
> most guys "at home" equipment.

A good idea to leave the oil fill cap off while testing as you will
always have a slight leakage around the rings, but obviously you can
make your own determination on how much is *too* much. I dont remember
if anyone mentioned this, but the cylinder you are testing *MUST* be on
TDC of the compression stroke; if it isn't then the engine will rotate
when you shoot the air to it. (Dont want any of the members losing a
typing finger!) :-)

> I think some auto parts stores will rent them, or you can make your own

I think the last one I bought was $75 or so, but that's been 8-9 years
ago. (Wish it hadnt walked away too! All this discussion convinces me
I need another one in my toolbox.)



Tim Turner/Manic Mechanic
Custer Auto Repair
Wilmington NC
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Date: Sun, 28 Feb 1999 01:23:47 -0500
From: Dan Shade
Subject: FTE Perf - Intake advice

I am looking to replace an intake manifold on a small block (351W).
Does anyone have any experience with Edelbrock, Holley, or Weiand
intakes? Basically, I am looking for good low rpm torque and
horsepower. The engine currently has a stock cam, stock manifolds, and
a 600cfm 1850 Holley carb. I am planning on still using the same carb.

Dan Shade

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End of perf-list-digest V2 #52
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