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Posted by: Catorse Jan 4 2016, 11:02 AM

Hi guys,

Lots of info on a peterson type oil tank for my /6 conversion on the forum, but I can't seem to locate anything on how to plumb it. Is it basically the same plumbing runs as the fender mounted tanks - except the tank is physically located up in the front trunk?

Any advice appreciated!

Posted by: Mark Henry Jan 4 2016, 11:36 AM

You will need an oil filter in the feed line and you should go one size bigger for the return line for a front mounted tank (from AN-16 (1") to AN-20 (1 1/4"), IIRC).

If it's a street car the money you save on the tank you will burn up in hose/plumbing cost.

Posted by: dflesburg Jan 5 2016, 09:01 AM

Line IN - second highest is in from filter

Line in from engine should go to therm to filter , then to motor (and to cooler and back)

Line OUT - lowest is out back to motor, highest is to catch can/breather

Others can be capped off.

catch cans, filters, thermostats, coolers, hoses, connectors, ends, caps and fittings are all very expensive parts...

Posted by: Catorse Jan 5 2016, 09:45 AM

Thanks guys!

The car is a street car, and I already have the oil cooler. This is a fresh build, top of the line stuff, and have over 40K invested in the build alone. So this is not a cost saving measure, although I am very chagrined at the cost of the fender tank for what I am getting.

Anyone care to venture a cost comparison between the petersen and a fender tank???

How about from a pure performance standpoint?

Posted by: 76-914 Jan 5 2016, 09:57 AM

Looks like the Petersen will kill your front trunk storage and/or be eye candy for a cars and coffee meet.

Posted by: Catorse Jan 5 2016, 11:01 AM

Cool with that - between the oil cooler, the louvered floor, and the fact that I moved the battery to the front trunk, that won't be much of a storage area anyways. This car is a boulevard cruiser, and I don't intend to carry much of anything. Have other cars to carry stuff in.

Posted by: Mark Henry Jan 5 2016, 12:19 PM

Like I said any savings between the two tanks will be eaten up by hoses and fittings. Even if you did come in a couple of bills cheaper that pales compared to the $40k project price tag.
Performance wise the fender tank is more than adequate in a street car.

There's a guy here, with a recent thread, that is building his own tank which he is planning to sell. He was hoping for a price point below the Patrick tank.

Posted by: Catorse Jan 5 2016, 02:10 PM

True, but there is another factor I forgot to mention....I welded on steel flares, then I did the Tangerine pick up points kit. I then faired the whole body and am ready for paint, and I am now just figuring out that the friggin oil tank lives in the fender. I don't think i can squeeze it in there with the tangerine kit (could be wrong tho), and I don't want to do major surgery to the engine bay which has already been painted.

Yes, I should have known better. I own 3 other porsches (not 914s) and honestly did not know the tank was sandwiched between the engine bulkhead and the fender or else i would have installed it when I had the fender apart for the flares.

So I am kinda trying to recover from an honest mistake :-)

Posted by: Mark Henry Jan 6 2016, 01:48 PM

Ahhhh

With your location you might be able to borrow a tank from a member to see if it fits.
If it doesn't then the front tank is likely the only other option.

Posted by: Mueller Jan 6 2016, 01:59 PM

Silly question:

Is the "peterson" tank an alternative to running an oil tank in the engine compartment?

Posted by: Catorse Jan 6 2016, 06:58 PM

Yes!