Convert '72 oil tank to 964/993 fill?

[blue72s]

My car is a '70 911 coupe and I would like to retrofit a '72 oil tank but I don't want an oil door on the rear quarter, so I wondering whether it would be possible to make modifications to the '72 tank for 964 style fill?

How are 964/993 tank filled? From the bottom? Does it use a pump for filling?

Thanks.

[targa72e]

The oil filler on the 964 is in the engine compartment. It has a tube that connects to the oil tank.




john

[Bill Verburg]

Originally Posted by blue72s

My car is a '70 911 coupe and I would like to retrofit a '72 oil tank but I don't want an oil door on the rear quarter, so I wondering whether it would be possible to make modifications to the '72 tank for 964 style fill?

How are 964/993 tank filled? From the bottom? Does it use a pump for filling?

Thanks.

'72 oil system





964 oil system





993 oil system, adapted into a 930







The main difference between 964 and 993 is that the 993 has an oil filter at the bottom, the 964 has it in the engine compartment

[blue72s]

Thanks for the replies and pictures.

What I'm asking - can an actual '72 tank be modified to work in conjunction with a 964/993 filler neck in the engine compartment? i.e. Can an inlet be welded at the bottom of the '72 tank for the filler tube?

[blue72s]

Originally Posted by Bill Verburg

The main difference between 964 and 993 is that the 993 has an oil filter at the bottom, the 964 has it in the engine compartment

It seems that the 993 has 2 oil filters - one directly under the oil tank and another on the crankcase like this:

[Bill Verburg]

Originally Posted by blue72s

It seems that the 993 has 2 oil filters - one directly under the oil tank and another on the crankcase like this:

Yes, 993 has 2 oil filters
the large main on is under the oil tank
the smaller secondary one is where the oil cooler would be on an older 911 engines.

The main one is on the scavenge side of the pump and second on the pressure side




an issue w/ the '72 tank is it's small size

All the tank conversions i've seen use 964 or 993 tanks, the 964 seems to be the more straightforward one

[Evan Fullerton]

A door jam filler neck is another option. I am putting a 993 tank in my car as they are all stainless construction vs. the 964 or ‘72 and in my mind that makes it easier to modify…….. I wouldn’t necessarily recommend it though. It’s a ton of work at least the way I’ve gone about it with dubious benefit.

[ericwitte]

Why would you want to retrofit to a 72 tank? Is it a track car and you want to move the oil tank forward of the wheel for balance? My 72 had a g body tank in the engine compartment but the 72 oil
door remained. When I did my recent restoration, we went back to the 72 tank and piping. It was not easy. If there is no aesthetic reason (ie cut a hole for a singer like filler neck on the quarter), perhaps keep it stock.


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[blue72s]

Originally Posted by ericwitte

for balance?

The main reason is heat.

Quote from Tyson Schmidt in another thread many years ago:

All you need to do to fully appreciate the benefits, is to stand near the back of a running 911, and then just take a few steps forward to where the '72 oil tank is. It's a huge difference. I've actually burned the tops of my feet from standing right near where the '73 oil tank is while wearing sandals. Up ahead of the rear wheel, it's cool as a cucumber.

[Evan Fullerton]

Heat or no heat, it’s a ton of work and money and messing around for very small gains unless you really want to do it for exhaust clearance or turbos or some other packaging reason.

On a street car the weight distribution difference is minimal and any difference in heat in the oil can be over come with a slightly more efficient oil cooler setup.

[blue72s]

Originally Posted by Evan Fullerton

Heat or no heat, it’s a ton of work and money and messing around for very small gains unless you really want to do it for exhaust clearance or turbos or some other packaging reason.

On a street car the weight distribution difference is minimal and any difference in heat in the oil can be over come with a slightly more efficient oil cooler setup.

Thanks.

[ericwitte]

Originally Posted by Evan Fullerton

Heat or no heat, it’s a ton of work and money and messing around for very small gains unless you really want to do it for exhaust clearance or turbos or some other packaging reason.

On a street car the weight distribution difference is minimal and any difference in heat in the oil can be over come with a slightly more efficient oil cooler setup.

Agree-I installed finned elephant racing oil lines to my front carrera cooler. Car runs at perfect temp (built high comp 3.4 with the 72 tank)


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