Dry Sump Oil Tank mounting question... 40Ford??????
#244924
03/06/09 01:59 PM
03/06/09 01:59 PM
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Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust
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OP
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Joined: Feb 2005
Posts: 5,207
Menomonee Falls
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I was talking to one of the local circle track guys here and he told me the return line has to empty into the tank higher than the engine  He didn't know why thats just what he was told. Can anyone explain this to me.
Last edited by R5P7Duster; 03/06/09 04:15 PM.
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Re: Dry Sump Oil Tank mounting question... 40Ford??????
[Re: DemonDust]
#244925
03/06/09 05:43 PM
03/06/09 05:43 PM
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Joined: Sep 2003
Posts: 1,049
San Jose Ca.
boatracer572
super stock
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super stock
Joined: Sep 2003
Posts: 1,049
San Jose Ca.
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I have never heard that! I would just make sure Its higher than the pump!
Last edited by boatracer572; 03/06/09 05:51 PM.
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Re: Dry Sump Oil Tank mounting question... 40Ford??????
[Re: boatracer572]
#244926
03/06/09 06:42 PM
03/06/09 06:42 PM
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Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust
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Posts: 5,207
Menomonee Falls
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Quote:
I have never heard that! I would just make sure Its higher than the pump!
Thats what I thought too.. Being higher than the engine makes no sense to me 
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Re: Dry Sump Oil Tank mounting question... 40Ford??????
[Re: 40ford]
#244931
03/07/09 11:41 AM
03/07/09 11:41 AM
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Joined: Nov 2006
Posts: 858
Oklahoma
silverfish
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super stock
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Oklahoma
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Quote:
Under normal conditions---you do not need to reprime the pump before startup. If we haven't started the engine for a week, we might spin the engine over for 15 seconds before turning on the ignition. If we haven't started the engine for 1 month, we probably would reprime.
Think about a dry sump system as two separate systems, the pressure system and the scavenge system. The scavenge system goes from the oil pan to the pump and into the top of the tank. There is no way for the oil to get from the tank back into the oil pan if it is plumbed correctly. The tank keeps the pressure section always primed---and there is no way that gravity can drain a tank UNLESS the tank is mounted well above the engine.
Thanks! I was wondering about just spinning the engine over like you say. Thats basically the same as spinning it over with a drill. Also, I'm glad you confirmed the drain back thing too. I thought the exact same thing when I was told the oil would run back into the pan. The only line coming out of the bottom of the tank is the suction line that goes to the pump. Thanks for the clarification.
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Re: Dry Sump Oil Tank mounting question... 40Ford??????
[Re: 40ford]
#244932
03/07/09 11:58 AM
03/07/09 11:58 AM
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Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust
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Menomonee Falls
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Great! Thanks for the all the info. I didn't want to burn anything up either. Pretty simple. I was wondering about turning the engine over with the ign off to prime it, if it sits for a while. Thanks again 
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Re: Dry Sump Oil Tank mounting question... 40Ford??????
[Re: silverfish]
#244933
03/07/09 11:59 AM
03/07/09 11:59 AM
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Joined: Sep 2003
Posts: 1,049
San Jose Ca.
boatracer572
super stock
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super stock
Joined: Sep 2003
Posts: 1,049
San Jose Ca.
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Peterson Fluid systems make nice drive nuts for the pump pulley to prime!I can remove the belt
on the pump,and spin the pump by "hand" and see 40 psi!!
Last edited by boatracer572; 03/07/09 12:00 PM.
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Re: Dry Sump Oil Tank mounting question... 40Ford??????
[Re: DemonDust]
#244936
03/07/09 07:27 PM
03/07/09 07:27 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Romeo MI
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Quote:
One more dumb question, can these pumps cavitate and lose their prime if there isn't any oil for them to pickup for a short time? Say on accel or decel?
Just curious, cause my block has a scavenge in the rear of the cam tunnel, but the cam tunnel has some holes drilled in it to drain to the oil pan. Should I run the pickup in the rear or just cap it off? Cause it may be just sucking air %80 of the time 
As 40 said they do run some oil all the time but you
have 2,3, or even 4 times the scavenge rate of the
supply side... also this is the reason the dry sump
creates a vac in the engine. With just the dry sump
on my engine it creates 12" of hg in the higher revs
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