How to prevent oil from pushing through breathers?
02-21-2009, 09:50 AM
#41
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02-21-2009, 11:00 AM
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Here is what my engine builder supplied. I added drain valves to the bottom of the tanks.
02-22-2009, 04:17 PM
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I have seen on average 30+ HP and can guarantee this with 15 inches of vacuum. This will not cause oil pressure to fluctuate. Believe me, I have been able to pull 40 inches of crankcase vacuum on my NHRA Pro Stocker and it does not effect oil pressure. I use one pump per engine, on pleasure boat applications I run 15 inches all day long.
I've seen a couple where the Vac pump didn't make as much as expected, but then when we swapped pans it came around huge. I was only pulling 10-12 inches though and maybe that makes a difference, but it seems like a bigger pan with side kick-outs really helps.? Thanks, Alex..
02-25-2009, 11:58 PM
#44
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rbtnt thats the same as mine , it cured my oil blowby mess.The Whipple kit came with a 3/8 line and filter,it would blow oil out of it, my theory was it had more velocity so the oil would not separate from the air coming out ,the #12 the velocity was slowed way down and the oil would separate from it, Kinda like how a dry sump tank works.
Peterson makes the tank any way ya want,around 79.00, I ran # 12 hose as to let the oil separate from the air coming out of the block, there not even any residue on the can ,no more smell.
another thread on it,
http://www.offshoreonly.com/forums/g...wer-motor.html
http://www.offshoreonly.com/forums/g...endations.html
Peterson makes the tank any way ya want,around 79.00, I ran # 12 hose as to let the oil separate from the air coming out of the block, there not even any residue on the can ,no more smell.
another thread on it,
http://www.offshoreonly.com/forums/g...wer-motor.html
http://www.offshoreonly.com/forums/g...endations.html
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03-01-2009, 01:52 AM
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Vacuum pump or
Breather tank or
Vent to air cleaner
Vacuum pump is best(Next to dry sump which has plenty of scavenge
), breather tank=obvious next best. Venting to the air cleaner will keep the engine compartment fairly clean but it's really not a good idea for a HIGH_HP(800 hp+ I really shouldn't state that it's hp related.... if you're close to the edge octane wise, this "blowby" could be trouble) engine. The oil vapors are there because things are going by the rings, right? That's not all that ends up being spit out....oil, right? How about this might induce detonation?
Anyhoosit, back to my cave
Breather tank or
Vent to air cleaner
Vacuum pump is best(Next to dry sump which has plenty of scavenge
), breather tank=obvious next best. Venting to the air cleaner will keep the engine compartment fairly clean but it's really not a good idea for a HIGH_HP(800 hp+ I really shouldn't state that it's hp related.... if you're close to the edge octane wise, this "blowby" could be trouble) engine. The oil vapors are there because things are going by the rings, right? That's not all that ends up being spit out....oil, right? How about this might induce detonation? Anyhoosit, back to my cave
Last edited by RichardCranium572; 03-01-2009 at 01:56 AM.
03-29-2009, 04:35 PM
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one vac pump for 2 bb chev engines
I run a vacuum pump and it is great for oil blow-by control. I don't agreed with the 30+ hp in a wet sump marine application. My dyno experience with standard tension oil rings @ 15" of vacuum is less than 10 HP. Any more vacuum than 15" caused my oil pressure to fluctuate on the dyno...VP fighting the oil pump.
For absolute blow by control on a wet sump system, all you need is any negative pressure. To rig this VP system right, figure on a $1500+ project.
You can use one VP on twin BB....works great.
For absolute blow by control on a wet sump system, all you need is any negative pressure. To rig this VP system right, figure on a $1500+ project.
You can use one VP on twin BB....works great.
