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  #1  
Old 11-11-2004, 07:32 AM
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Thumbs up Blow By Solution ????

I found this while doing a search on blow by. All you mechanical engineers, will this device work on a diesel? Please let me know.

http://www.misterfixit.com/envalve.htm

Thanx....


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Old 11-11-2004, 07:45 AM
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I would tend to be sceptical about those claims..............and anyway I don't think it would work as there is no vacume source on a diesel this would work with like a gasser

But I could be wrong.
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Old 11-11-2004, 07:52 AM
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Thumbs up Mensa ???

I knew a genius would offer a solution!! How many Mensa members frequent this forum? Thanx for the reply Doc, I was kinda figuring with no natural vacuum in a diesel, this would not work....
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1984 300D Turbo Sedan (Hilda) 272,115 miles.....
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2001 Dodge Stratus (Silver) (wifes) 55814 miles...

1982 280TE Wagon Astral Silver Metallic/
Anthracite Velour
260,512 miles (Eva)

1969 230 Sedan Olive Green/Black MBTex
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  #4  
Old 11-11-2004, 08:00 AM
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I tend to be sceptical of anything that offers a miracle cure, And that one seemed to be geared to the people with worn out engines and seemed to promise a bolt on fix for what really is need for a rebuild.
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  #5  
Old 11-11-2004, 08:01 AM
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based on my experience as both a Mechanical engineer and Physicist, no. That's not to say that this is specific to a diesel. Sure, a diesel has much higher compression and thus harbors a greater potential for performance degradation via blowby than a gasser. But fundamentally, evacuation of any IC crankcase requires power. This power comes from the operation of pistons and valves which pull gases from the crankcase. Unless this device has a big pump in it, it doesn't do what it claims. The oil companies don't really buy the rights to every engine invented to run on water. The principle violated here is conservation of energy. In non-nuclear reactions, energy in equals energy out. Energy may certainly be converted into forms that we differentiate between, but energy is conserved. Period.
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Old 11-11-2004, 08:12 AM
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Thumbs up Just a thought

Whew..... But, if you have excessive blow by, would it not entail having excessive smoke coming from the tail pipe? I just can't see blow by being a silent killer.
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2001 Dodge Stratus (Silver) (wifes) 55814 miles...

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Anthracite Velour
260,512 miles (Eva)

1969 230 Sedan Olive Green/Black MBTex
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  #7  
Old 11-11-2004, 08:14 AM
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Quote:
Originally Posted by boneheaddoctor
..and anyway I don't think it would work as there is no vacume source on a diesel

But I could be wrong.
What about that large vacuum line that goes from the vacuum pump to the air intake- or in my case ('76 300D) the intake manifold? (See picture) Isn't the purpose for that to create manifold vaccum that a Diesel wouldn't normally create, so that the PCV will function?
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Old 11-11-2004, 08:17 AM
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Quote:
Originally Posted by coldwar
What about that large vacuum line that goes from the vacuum pump to the air intake- or in my case ('76 300D) the intake manifold? (See picture) Isn't the purpose for that to create manifold vaccum that a Diesel wouldn't normally create, so that the PCV will function?
thats for accessories and is not a high volume vacume source such as a gassers intake manifold.
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Old 11-11-2004, 08:48 AM
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The rubber tube ontop of the valve cover next to the oil filler cap is where crankcase fumes (blowby) are pulled into the intake from. Excessive blowby is when exhaust gases leak into the crankcase (usually past worn rings/cylinders/pistons) enough to cause problems. Some blowby is normal
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Old 11-11-2004, 08:59 AM
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Quote:
Originally Posted by Pete Burton
The rubber tube ontop of the valve cover next to the oil filler cap is where crankcase fumes (blowby) are pulled into the intake from.
Right- and because Diesels have no manifold vacuum of their own, the fumes are pulled in with the assistance of this big vacuum line that connects right to the pump.

Dave
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Old 11-11-2004, 09:07 AM
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Quote:
Originally Posted by coldwar
Right- and because Diesels have no manifold vacuum of their own, the fumes are pulled in with the assistance of this big vacuum line that connects right to the pump.

Dave
what line and what pump.........the vacume pump does not equal an intake vacume. Most diesel vacume pumps are not even connected to the intake. And venting crankcase hydrocarbon vapors directly to the atmosphere is highly frowned upon by the EPA. And how does this cure excessive blowby?
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Old 11-11-2004, 09:27 AM
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Quote:
Originally Posted by boneheaddoctor
what line and what pump.........the vacume pump does not equal an intake vacume. Most diesel vacume pumps are not even connected to the intake. And venting crankcase hydrocarbon vapors directly to the atmosphere is highly frowned upon by the EPA. And how does this cure excessive blowby?
If you look in my picture (above), I'm referring to the thick plastic tubing right in the foreground. You'll notice that the left end of it connects to a disk-like one way valve and then to a coipler on the intake manifold which is barely out of the picture. The black rubber hose connecting the manifold to the valve cover is also in view. The right end of the plastic tubing goes down directly to the vacuum pump on the other side of the engine. So we have the vacuum pump (same one that operates power brakes and accessories) connected directly to the intake in order to create vacuum in the intake so that fumes do not go to the atmosphere, but rather get sucked into the manifold, from where they get sucked into the engine when the intake valves open.
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Old 11-11-2004, 09:42 AM
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That clear line on the Vacume pump isn't vacume, its the pressure vent from the output of the vacume pump. Think about it, it sucks on one end creating the vacume this is what it dumps out. Think a minture shop vac. If you DID hook up to the vacume pump on the vacume end with the crank case vapors and suspended oil youwould kill the diaphrams and check valves in the vacume pump post haste.

Besides it doesn't have the capacity to suck the crankcase to a negative pressure level with the motor off much less running, and then it would be a huge vacume leak and none of your accessories would work even if it wouldn't self destruct (the vacume pump)
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Last edited by boneheaddoctor; 11-11-2004 at 10:15 AM.
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  #14  
Old 11-11-2004, 10:38 AM
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Lightbulb

Quote:
Originally Posted by boneheaddoctor
That clear line on the Vacume pump isn't vacume, its the pressure vent from the output of the vacume pump. Think about it, it sucks on one end creating the vacume this is what it dumps out. Think a minture shop vac. If you DID hook up to the vacume pump on the vacume end with the crank case vapors and suspended oil youwould kill the diaphrams and check valves in the vacume pump post haste.

Besides it doesn't have the capacity to suck the crankcase to a negative pressure level with the motor off much less running, and then it would be a huge vacume leak and none of your accessories would work even if it wouldn't self destruct (the vacume pump)
Ah yes- light bulb moment for me! Your vacuum cleaner analogy makes sense. So this plastic tube is actually blowing into the manifold instead of sucking from it!
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Old 11-11-2004, 11:13 AM
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Quote:
Originally Posted by coldwar
Ah yes- light bulb moment for me! Your vacuum cleaner analogy makes sense. So this plastic tube is actually blowing into the manifold instead of sucking from it!
Exactly..................

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