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#102
Super Moderator
iTrader: (3)
Nobody does but you could. The idea of a pump is not to just relieve pressure but to put the crankcase under constant vacuum. After learning what a cluster the stock PCV is I wonder if a pump would not work very well on an LSJ in the AC compressor or tensioner location. More weight vs a few hp. More complex vs stupid simple. This is all out race stuff but since dabbling in that is what we do..... Tech: How External Vacuum Pumps Free Up Horsepower - EngineLabs
#105
#109
Pulls vacuum or creates vacuum. That would be referred to venturi or ported vacuum which is usually less than 1 inch of mercury. About 15" less than what is needed to evacuate a crankcase.
Last edited by Henry3959; 09-13-2017 at 05:16 PM.
#114
I did some poking around and all I could find were stock electric smog pumps that suposidly don't last long when run continuously. That sucks.
#116
Ok... I have been a GM Field Engineer since March of 1980... You will have to explain this one to me and I am sure others. Besides the interference double o-ring fit there is also gravity. So when you shut your engine off your dip stick just starts to levitate out of the tube?
If your blowing your dip stick out of an OEM production vehicle you have a defective stick, tube or too much crankcase pressure building up. And even on a high boost engine you have an issue as you are not properly evacuating the crankcase for the build. Then there are those that put a blower on their 2.4's and 2.2's that blocked off the PCV system wondering what went wrong.
#117
Senior Member
iTrader: (1)
Ok... I have been a GM Field Engineer since March of 1980... You will have to explain this one to me and I am sure others. Besides the interference double o-ring fit there is also gravity. So when you shut your engine off your dip stick just starts to levitate out of the tube?
If your blowing your dip stick out of an OEM production vehicle you have a defective stick, tube or too much crankcase pressure building up. And even on a high boost engine you have an issue as you are not properly evacuating the crankcase for the build. Then there are those that put a blower on their 2.4's and 2.2's that blocked off the PCV system wondering what went wrong.
#118
That is my point but that is not what he is saying. I believe there are a lot of members here that don't quite understand vacuum, atmospheric pressure and boost, little lone what goes on in the crank case. At WOT all naturally aspirated engines drop to zero or near zero engine vacuum. Around 7" H2O or less. Their dip sticks do no come out.
#119
Senior Member
iTrader: (1)
Ok... I have been a GM Field Engineer since March of 1980... You will have to explain this one to me and I am sure others. Besides the interference double o-ring fit there is also gravity. So when you shut your engine off your dip stick just starts to levitate out of the tube?
If your blowing your dip stick out of an OEM production vehicle you have a defective stick, tube or too much crankcase pressure building up. And even on a high boost engine you have an issue as you are not properly evacuating the crankcase for the build. Then there are those that put a blower on their 2.4's and 2.2's that blocked off the PCV system wondering what went wrong.
#121
Ok... for those that give a **** while some are still learning how to wipe their ass.
An example of the absolute air pressure / vacuum correlation within the intake manifold of a boosted car at sea level capable of creating 15psi of boost
An example of the absolute air pressure / vacuum correlation within the intake manifold of a boosted car at sea level capable of creating 15psi of boost
Last edited by Henry3959; 09-14-2017 at 08:52 PM.
#122
Super Moderator
iTrader: (3)
That is my point but that is not what he is saying. I believe there are a lot of members here that don't quite understand vacuum, atmospheric pressure and boost, little lone what goes on in the crank case. At WOT all naturally aspirated engines drop to zero or near zero engine vacuum. Around 7" H2O or less. Their dip sticks do no come out.
#123
Sadly you do not understand even the most basic principles of an internal combustion engine.
That doesn't surprise me as most who grew up after the carbureted cars were out of production don't. It's the fact that you're still trying to explain that engine vacuum at WOT moves to different places within the engine
Last edited by Henry3959; 09-14-2017 at 10:57 PM.