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Subagon Oil Capacity

09/18/2010 1:19 PM

Hello All,

I am doing a Subaru Vanagon conversion, putting an h-4 subaru motor into an 84 vanagon. I shortened the oil pan in the process for ground clearance. Yahoo conversion site is a wealth of information but I thought some outside opinion would be good here.

I have reduced the oil capacity by about 2 qts. I need to regain that and even exceed that, the more the better as long as it maintains correct sump level. I am planning to add an external oil cooler but was also thinking of where i could add more volume to the system.

Here's where I'm foggy. I was thinking that just as the external cooler adds volume, could I just add a length of considerably larger diameter tube or pipe in the system? I would take it off of the oil cooler loop. Thinking of the oil filter adapter thing, has anyone built one of these? What about which side of the loop? pressure or return? Is it either/or better/worse six of one/half dozen of other?? Any odd dynamics involved, i.e. unwanted pressure drops that might starve the oil supply in any way?

thanks in advance! Questions?

Stolisma

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#1

Re: SUBAGON OIL CAPACITY

09/18/2010 1:30 PM

Should work fine. Just make sure all that added capacity is below the max level of the crankcase. If it is above that, when you turn the engine off the oil will drain back into the sump and could cover the crankshaft. If this happens you will get foaming and all sorts of problems on start-up.

Bottom line don't let oil contact the crankshaft, from the outside, ever.

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#2

Re: Subagon Oil Capacity

09/18/2010 7:26 PM

Because of the small difference between too high and too low oil level, you should check the oil say twice as often as before. If you also change the oil twice as often, you may do just fine with the smaller oil charge. Adding the auxiliary volume will enable the normal oil change interval, but I don't think it helps with the frequency of checking the level.

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#3

Re: Subagon Oil Capacity

09/18/2010 7:43 PM

Hello stolisma, this may work for you. In the loop to/or from the oil cooler depending on if the oil goes on into the engine under pressure or it returns to the oil pan. You could have a remote tank with inlet and outlet on top both having tubes that extend almost to the very bottom. A way to fill it on top with engine off, a drain outlet on the bottom "for when you change the oil", a level sight or tube on side to see level and the whole thing to withstand oil system pressure.

If the tank return goes to the oil pan the tube to the bottom on the output is not needed. This is to keep suction from draining the tank's content to the oil pan which would over fill the oil pan.

The idea is something similar to a water tank in the home with out the heaters of course. Unless your in a very cold climate.

Charles

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#4

Re: Subagon Oil Capacity

09/19/2010 2:38 PM

Unless you are installing a dry sump, a scavenger pump below the engine that feeds a large external oil supply from which oil is drawn to lubricate the engine, (frequently used in racing and other high performance engines) you need to increase sump capacity. The greatest danger of reducing the sump capacity by 40%, 2 out of 5 quarts, is the oil pump might begin to draw air during a hard run with sharp curves that flings the oil on to the outside wall of the sump. Having two or more quarts of oil in the cooler and the lines from the engine to the cooler will not prevent that problem. I am confused by your statement that you had to reduce the oil pan capacity because of "ground clearance" because the Vanagon has considerable ground clearance.

Your best solution is to buy, or fabricate, a sump that is broader than the engine but holds the same capacity as the OEM sump.

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#5

Re: Subagon Oil Capacity

09/19/2010 7:02 PM

Add 5 qts to the pan to see where the level is. Is it too high? Often the pan has room for the crank to keep away from the oil to not froth it up too much. You may get by as it is, simplest option if acceptable, be below the seals on the crank.

In my Dodge challenger that gets driven rarely, I have a 2 qt. Accumulator that stores the oil so that I can open it to wet the bearings before I start. You could use such a pressurized contaniner to store the additional oil needed for handling sloshing in turns to maintain pressure and full oil supply to the bearings.

Enjoy, Woody

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#6

Re: Subagon Oil Capacity

09/19/2010 11:05 PM

DennisWaller has nailed it on the head. If you can shorten the pan, you should be able to make it wider, or longer. If you want some ideas, look for custom oil pans. Canton, Hamburg, and Moroso all make pans that should help you decide how to do it. Good luck. There is a product that can work as a crutch if cornering still is uncovering the pick up. It is called an accusump. Basically an empty can that is pressurized with oil when the engine is running. As the pick up pulls air, and oil pressure drops, the stored oil will become higher than the oil pressure, and will now flow from the accusump to the oil galleries to protect the engine bearings. For these devices, it becomes proper to overfill the oil pan by the volume of the accusump. Good luck.

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#7
In reply to #6

Re: Subagon Oil Capacity

09/20/2010 6:17 AM

You said the pan is "shorter" but is there sufficient clearence for the pickup to the bottom of the pan? That escaped me yesterday but is important too. Woody

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