hunting for vacuum leaks
#2531634
08/04/18 09:28 PM
08/04/18 09:28 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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what mean's do you guys that run a vac pump use to check for leaks, also what oil breather are you using, I have a small moroso that has a breather on top and a petcock on bottom to drain but has some sort of coarse steel wool/scratchy pad like baffeling and is doing a poor job of containing the oil, I have to keep a couple of shop towel's wrapped and zip tied around the breather cap.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: hunting for vacuum leaks
[Re: Dave Hall]
#2532042
08/05/18 09:06 PM
08/05/18 09:06 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
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OP
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Mt. Vernon, Ohio
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The shop towel, zip tie is a typical deal. Same on mine. I think that the volume of the tank is so much smaller than the volume of the engine that it moves a lot of air through it. You could try smoke at or around 3,000 rpm. Maybe bench test the smoke at the largest vacuum the engine makes so you can get a feel for what it trails like. It will be hard to detect. The valley pan and valve cover area are the most likely culprits. Running a gear or belt drive will help that area. The oil pan is the largest gasket area but gets some help from the oil itself. I know that pulling the dip stick and capping the tube made an inprovement and cut back the amount of oil in the tank but this is with little to no vac showing on the gage and the regulator wide open to the point the check ball isn't even seated, so I know it's sucking air somewhere, just got to find it.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: hunting for vacuum leaks
[Re: dartman366]
#2532046
08/05/18 09:12 PM
08/05/18 09:12 PM
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Joined: Mar 2005
Posts: 1,552
Michigan
Kiddart
pro stock
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pro stock
Joined: Mar 2005
Posts: 1,552
Michigan
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Check the flatness of your valve covers. a friend of mine had the same issue
Thank you
Kiddart
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Re: hunting for vacuum leaks
[Re: dartman366]
#2532050
08/05/18 09:16 PM
08/05/18 09:16 PM
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Joined: Oct 2011
Posts: 3,036
bean town ....Ca
WHITEDART
master
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master
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
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I like to pressurize the engine with a constant 12 to 15 psi. You might have to get creative to install a fitting.. then I spray around with a spray bottle with water and 10% dish soap. You will be surprised at what leeks you will find
In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
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Re: hunting for vacuum leaks
[Re: Kiddart]
#2532051
08/05/18 09:18 PM
08/05/18 09:18 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
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I Live Here
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OP
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Posts: 13,247
Mt. Vernon, Ohio
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rails on the vc's are machined and so are the rails on the trick flow head's, using the Superformance CarbonX gaskets.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: hunting for vacuum leaks
[Re: WHITEDART]
#2532055
08/05/18 09:25 PM
08/05/18 09:25 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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I like to pressurize the engine with a constant 12 to 15 psi. You might have to get creative to install a fitting.. then I spray around with a spray bottle with water and 10% dish soap. You will be surprised at what leeks you will find Thanks for the tip Shilo, that the kind of thing I was wanting to know. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: hunting for vacuum leaks
[Re: dartman366]
#2532176
08/06/18 10:19 AM
08/06/18 10:19 AM
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Joined: Feb 2008
Posts: 715
Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 715
Central TEXAS!!!!
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Before buying a big electric vacuum pump, I had a 1hp electric motor and a long v-belt. I would jack up the car and set the pump below it with the long v belt and run the pump then light up a cigar and watch the smoke disappear into the engine.
joe
Without Data, you’re just another guy with an opinion.
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Re: hunting for vacuum leaks
[Re: sr4440]
#2532548
08/06/18 10:47 PM
08/06/18 10:47 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Before buying a big electric vacuum pump, I had a 1hp electric motor and a long v-belt. I would jack up the car and set the pump below it with the long v belt and run the pump then light up a cigar and watch the smoke disappear into the engine.
joe Well, thats another way to skin a cat, as they say, what ever work's
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: hunting for vacuum leaks
[Re: dartman366]
#2532831
08/07/18 03:42 PM
08/07/18 03:42 PM
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Joined: Jan 2003
Posts: 19,377
Las Vegas
Al_Alguire
I Live Here
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I Live Here
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Posts: 19,377
Las Vegas
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I use either Shilo method at the track or a smoke making at the shop. Been using smoke machines for years on new car repairs of EVAP system. An invaluable tool for sure.
"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: hunting for vacuum leaks
[Re: Al_Alguire]
#2533141
08/08/18 02:22 AM
08/08/18 02:22 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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this fitting works good for pressurizing a system with shop air & it is less than $3 at O'reillys. Be carefull, if there ain't much air (full of coolant) it will pump up FAST & 5 psi is plenty. I used it in the cooling temp sender 1/8 NPT port & on a seperate issue I made a smoke pump from a burning rag with baby oil in a paint can on a utube vid! (I found the leak).
live every 24 hour block of time like it's your last day on earth
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