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External oil pump?
Gimme' first hand experience on the maintenance, performance, reliability,
of external oil pumps. |
I guess I should have waited until everyone was up!!
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Dry sumps are great, but very expensive, and total overkill for a STREET CAR.. And always carry an extra belt.
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A dry sump and an external oil pump are not the same thing.
An external oil pump should be at least as reliable as an in-block oil pump. Because the external oil pump is belt driven there is the need to make sure the belt is in good condition and replace it periodically - on a race car the belt is replaced once a year whether it needs it or not. Performance should be the same - although most have some sort of adjustablilty. As far as overkill on the dry sump - a Cobra is already in that category, isn't it? |
Rather than the dry system I would reccommend a 2 or 3 quart Accusump. What do the experts say?
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I beat the accusump system with a Weldon pump 9200-A, I tapped into the oil pan, through the pump on to a filter, then a check valve, and on to the front side oiler plug. Works much better than accusump, pumps up to 40lbs for as long as the switch is on, also installed a low pressure switch that activates the pump, NASCAR uses this pump to cool rear end dope.
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If you want consistent oil preasure, an external pump is the way to go. I am running an external pump with the wet sump and an accusump also. I have had good luck. In corners on the race track, better oil control. Scott
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Coyled, is there a pressure relief built into your pump, to allow excess back to the pan?. What about the variations in pressure relating to RPM?.
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Perry, the pressure is 50 at idle and 80 pounds at 5000 to 8000 rpm. As to pressure relief, I don't know. RDI would not build the motor with out the external pump. scott
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Thanks coyled, the more info the better.
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Scott, I forgot to ask what pump you use.
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Pathenry -
Forgive me for jumping into this thread a little late, but I don't see how a great pump of any kind is a substitute for an Accusump. The Accumsump provides both oil pressure and a backup supply of oil when oil to the pump is lost. Wouldn't an external oil pump still be susceptible to oil loss during extended lateral G's? |
Tommy, my comments about the accusump were relating to pre oiling the engine prior to starting, with the accusump you only have 3 or so quarts for this purpose, if for some reason the engine does not start, your setting on an extra 3 quarts in the pan, the crank might not like this?. The pre oil system I built
is an electric pump, plumbed externally from the pan to the engine, never using more than you have. I'm looking into external oil pumps that replace the internal oil pump, they've been around a while, I'm just trying to get schooled. |
Perry, its a peterson pump. I used to have a bounce in oil pressure when I would enter corners back to back but has since gone away with the accusump. Scott
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Scott - are you datalogging your oil pressure? I'd be interested to see if there's any drop in pressure before the accusump takes over (that a mechanical gauge might not show).
Is there anything that you'd do differently in hindsight regarding the Accusump installation? Thanks! Craig |
craig, no I am not datalogging the oil pressure. At first, there was oil stuck at the top of the motor. Return holes in the heads were to small and crank case pressure was too high. I changed the venting and also installed return lines from the valve covers to the side of the pan. I then installed the accusump as I was still getting some oil slosh in back to back to back corners on the race track. If I had a spot to put a dry sump tank, I would go that route, but I don't have room, not without hacking up the car. I went with the 3 quart accusump which is really closer to 2 quarts, and also the mechanical valve version as it is bigger than the electronic valve. Scott
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Like Coyled, I have an external pump wet system. Using the Avaid pump with I think is the same as Moroso and Petterson for the wet pan application. Have EFI and went distributorless. On a BBF the external pump was as easy as finding a dummy oil pump dry. Added benefit is no distributor gear being eatten up.
RP |
Quote:
FYI, the new 5.4L to be used in the new Ford GT appears to use an external pump. |
Sizzler, my pump is driven with a cog belt. It spins as easy as an alternator so there is not much tension on the belt. Scott
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Where do I find the external oil pump for my sb. Is it the same as the Nascar motors use?
Do I have to refinance my house to pay for it? I already spent way too much for my new BB killer so I guess a few bucks more won't hurt.:CRY: Cranky :JEKYLHYDE |
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