Re: Leak Down Tester Suggestions
[Re: RP's R/T's]
#2174635
10/14/16 04:21 PM
10/14/16 04:21 PM
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Joined: Jan 2003
Posts: 8,028 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,028
Tulsa OK
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Since I am not working on a pro stock I just made one. Bought a nice gauge and some pipe fittings and used part of my compression tester to plug into the cylinder. Works great and very cheap.
68 Barracuda Formula S 340
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Re: Leak Down Tester Suggestions
[Re: RP's R/T's]
#2174664
10/14/16 04:59 PM
10/14/16 04:59 PM
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Joined: Jan 2003
Posts: 19,376 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,376
Las Vegas
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Do yourself a favor and get a two gauge tester....FWIW I have had great service from my OTC leakdown tester for years.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Leak Down Tester Suggestions
[Re: RP's R/T's]
#2174678
10/14/16 05:16 PM
10/14/16 05:16 PM
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Joined: Jan 2003
Posts: 6,531 Jacksonville, FL
Chris2581
master
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master
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
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Mine is from Matco tools. It's a quality piece that has worked very well over the years.
Nautilus Racing- We use Superformance gaskets and Turbo Action converters/products.
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Re: Leak Down Tester Suggestions
[Re: Bad340fish]
#2174728
10/14/16 06:27 PM
10/14/16 06:27 PM
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Joined: Jan 2003
Posts: 25,892 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,892
Rio Linda, CA
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Since I am not working on a pro stock I just made one. Bought a nice gauge and some pipe fittings and used part of my compression tester to plug into the cylinder. Works great and very cheap. The good testers have a correctly-configured orifice, pretty hard to duplicate at home since the orifice size and approach angle are critical.
The INTERNET, the MISinformation superhighway
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Re: Leak Down Tester Suggestions
[Re: RP's R/T's]
#2174746
10/14/16 06:46 PM
10/14/16 06:46 PM
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Joined: Jan 2003
Posts: 8,028 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,028
Tulsa OK
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Interesting, I will have to compare it to a real tester and see how it does. I have mainly used it to compare cylinder to cylinder numbers which I think this one works OK for. I need to check leak down on the new engine and I will compare it to an actual tester. Thanks for the info.
68 Barracuda Formula S 340
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Re: Leak Down Tester Suggestions
[Re: Bad340fish]
#2174775
10/14/16 07:53 PM
10/14/16 07:53 PM
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Joined: Aug 2003
Posts: 43,230 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,230
Bend,OR USA
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I bought a older Moroso single gauge unit years ago, I still have it but the needle started sticking so I bought a better two gauge unit when I owned a airplane that was FAA approved from Aircrafts Spruce Chief Aircraft supply in Grants pass, OR supply also sells them Buy a good one now, not later Good tools should last forever, if taken care of
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Leak Down Tester Suggestions
[Re: RP's R/T's]
#2174809
10/14/16 08:57 PM
10/14/16 08:57 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
master
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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I have an OTC #5609, very good and not to expensive.
Mopar to the bone!!!
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Re: Leak Down Tester Suggestions
[Re: RP's R/T's]
#2174980
10/15/16 01:15 AM
10/15/16 01:15 AM
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Joined: Dec 2005
Posts: 11,621 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,621
Fulton County, PA
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Old Moroso single gauge unit for me. I've had it for years.
If the results don't match the theory, change the theory.
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Re: Leak Down Tester Suggestions
[Re: RP's R/T's]
#2175042
10/15/16 02:47 AM
10/15/16 02:47 AM
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Joined: Jan 2003
Posts: 7,495 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,495
Minnesota
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I bought a 2 gauge summit with a built in adjustible regulator about 20 years ago. It has always worked fine.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Leak Down Tester Suggestions
[Re: RP's R/T's]
#2175057
10/15/16 03:38 AM
10/15/16 03:38 AM
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Joined: Aug 2003
Posts: 43,230 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,230
Bend,OR USA
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I think the standard recommended by Moroso, SAE and the aircraft industry is to set the input pressure to 80 lbs and then do the math off of the pressure drop to each cylinder, IE 80/78=2.5% Don't forget to make sure the gauge you buy and use has the metered orifice to keep it accurate
Last edited by Cab_Burge; 10/15/16 03:39 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Leak Down Tester Suggestions
[Re: Cab_Burge]
#2175298
10/15/16 03:22 PM
10/15/16 03:22 PM
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Joined: Jan 2003
Posts: 25,892 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,892
Rio Linda, CA
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"In the United States, FAA specifications state that engines up to 1,000 cu in displacement require an 0.040" orifice diameter, 0.250" long, 60-degree approach angle. The input pressure is set for 80 psi, and 60 psi minimum cylinder pressure is the accepted standard."
A lot of automotive testers use 100 psi so the psi numbers represent the percentage...no math required.
The INTERNET, the MISinformation superhighway
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Re: Leak Down Tester Suggestions
[Re: RP's R/T's]
#2175384
10/15/16 06:56 PM
10/15/16 06:56 PM
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Joined: Jan 2003
Posts: 7,495 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,495
Minnesota
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Theres nothing wrong with having high quality tools. But not real nescessary in this aplication though. We don't need to prove to the FAA that our engines are good enough to power an airplane through the sky. We just need to know if the valves or the Rings or the head gaskets are leaking. I use 100 PSI in my low cost Summit tester and it tells me what I need to know.
Last edited by Hemi_Joel; 10/15/16 07:33 PM.
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Re: Leak Down Tester Suggestions
[Re: Hemi_Joel]
#2175482
10/15/16 09:37 PM
10/15/16 09:37 PM
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Joined: Aug 2003
Posts: 43,230 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,230
Bend,OR USA
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I think the FAA will accept up to 60% leakage and still let you operate the airplane with the proper sign offs The procedure is different also on aircraft leak down test, you don't test it at TDC, you pull the piston up being tested with the prop to about 120 to 90 degrees BTDC on the compression stroke and have someone read the gauge while holding the prop at that spot Sometines I will pull a piston up on one of my motors until the valves close to see what the bottom ring sealing looks like
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Leak Down Tester Suggestions
[Re: 71birdJ68]
#2175542
10/15/16 11:08 PM
10/15/16 11:08 PM
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Joined: Nov 2004
Posts: 3,517 pacific northwest
Stroker Scamp
master
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master
Joined: Nov 2004
Posts: 3,517
pacific northwest
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OTC here. works great and not too spendy
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip 73 Duster 340 street strip 12.79 @ 105
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