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Hey! Nice Rack! "Celette"
 
rich's Avatar
 
Join Date: Jan 1999
Location: Duluth Mn USA
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dry sump 4cyl.

I read somewhere that one of the weak links of the 4 cylinder engine is the oiling system. Does anyone have info (diagrams or photos)on how to plumb in a dry sump? As I understand this type of system is used for racing and autocrossing. Is this an acceptable system for street use? How about info on increasing oil pressure and volume?
Old 10-24-1999, 07:29 AM
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Join Date: Jul 1999
Location: Lafayette Colorado
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Try an Accusump, they advertise in Panorama Magazine.

[This message has been edited by mikez (edited 10-25-1999).]
Old 10-24-1999, 08:13 AM
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The dry-sump setup is *serious* $$$. It requires a multi-stage oil pump, a reservoir, and other stuff to make it work. It is only used on *really* serious race cars, and nowhere near all of those.

The major weakness of the oiling system is that the center-located oil pickup tube can suck air in if all the oil is sloshed over to one side of the motor. This can happen in long sweepers while racing. Much less common on the street.

The Accusump is a spring-loaded piston. You let the oil system get up to pressure (at idle is fine, ~10-20 PSI), and this pushes the piston back. If you're zooming along and the oil pickup gets uncovered (the oil sloshes away), the spring pushes the oil back into the oil passages. When the pressure in the system goes back up over the pressure of the spring, the piston is pushed back and re-filled.

It can, if a valve is added, also give you immediate oil pressure on start-up.

Other things include deep sumps, "oil traps" (AKA the "tuna can"), pipes to run the oil from the valve covers back to the "tuna can", adding baffling to the inside of the case, etc.

--DD
Old 10-27-1999, 01:06 PM
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