Turbo Oil Pump in SC Case

Tom Oxner · 09-02-2012, 03:39 PM

I purchased a 930 turbo oil pump to install in my 911SC case. Is there something missing on the pump pick-up? What type of screen can I use? Thanks for your help.

Tom

Flat6pac · 09-02-2012, 06:58 PM

Looks like it has something to do with the sump without a drain or the update on the later
SC with the screen piece that the SC scavange sump sits in, keeping oil available for the sump.
Just thoughts.
Bruce

tom1394racing · 09-02-2012, 07:13 PM

Tom

Looks to me like your Turbo pump is missing the screen.

ludvikagard · 09-03-2012, 05:20 AM

My SC-79 case looked like this, with the turbo pump. Dont know who or when it was installed.

Robert

Walt Fricke · 09-03-2012, 08:49 PM

What this tells me, other than the nice illustration of why you need a screen, even the rather larger mesh one on the later pumps, is that before the one piece cases came out (end of the SCs, as Porsche ran out of the previous cases before the end of the SC run, but had the molds already made for the no sump plate 3.2 cases), the turbo pumps must have had the separate screen shown in Robert's pictures.

It makes some sense that the early 930 pumps were this way, as all pumps with the sump plate were this way from the factory, I believe. And recall that while the 930 turbos were imported to the US from '76 (?, certainly 78) through 1979, there was a period there when none were.imported into the US - 80 and 81 for sure, and maybe not until '87?

But gray market cars started showing up. So you have my guess. Though if Tom Butler doesn't know where you would find the screen you need, you may have trouble finding one.

Look on the bright side - the cover plate you have you can reuse? With the curved screens you usually need to purchase the curved cover plate, or an aftermarket one.

Though I seem to recall that there was some back and forth with the SCs and pumps and plates - an oil pickup issue, perceived or real? Which was resolved by a new, different screen or insert? Which maybe had the curved plate also? Designed anyway to create more suction.

jamesjedi · 09-05-2012, 04:33 PM

A bump for Tom.

I am curious as well. Many of the 930/965 oil pumps for sale do not have the sreen.

Robert Espeseth · 09-06-2012, 04:49 AM

One more bump and a question or two ...

How about a 964 pump in a 3 litre ...is that a recommended upgrade?

And what is the difference between a 964 and a 930 pump?

Hope somebody can enligthen this, thanks

Walt Fricke · 09-06-2012, 06:49 PM

Robert - the 964 pump and the 930 pump are the same dimensionally and in output, if I remember this correctly, , but the turbo has a cast iron pressure side. The assertion one reads is that the cast iron is more dimensionally stable and thus better able to handle the needs of the arguably hotter turbo motor.

Unless you are building a high compression, high reving race motor, waste of money to use either of these bigger pumps, I think. And even at that, the 3.0 pump seems to have been quite adequate on a 250 rear wheel HP 2.8 motor I bought and used 8,200 as a shift point on. So I may have spent money I needn't have on the 930 pump I have in one motor, and the GT3 pump I have in another of about those sizes.

Robert Espeseth · 09-07-2012, 01:14 AM

Walt, and others, actually I'm collecting parts for an SS-3.2 with CR 10,5:1 so maybe it would be an idea to upgrade...? But do the 964 and 930 pumps pump more oil? I know they are bigger on the scavenge side...

I see that my 930 do have a very nice pressure on idle and warm engine..approxemately 3 bars ....while most of the 3 liters I have had is on a poor 1 bar at idle..

Any suggestions?

Now I have to run and load the car on the trailer....trackday tomorrow, juhuuuuu

ludvikagard · 04:08 AM

I have all new bearings, turbo pump in 3.0 sc case. Still 0.9 bar at 850rpm idle at normal running temp. Reaches 3,8 bar at 2800 rpm and no higher than that. Thats normal values as far as I know.

Tom Oxner · 09-07-2012, 05:31 AM

I appears that I have bought a 930 pump that requires a screen that even Tom Butler is not familiar with. If Tom Butler is not familiar with it, I think it would be near impossible to find. Suggestions for what to do with this 930 pump (other than use it for a paperweight)? Thanks for your help.

Tom

304065 · 09-07-2012, 06:04 AM

Look in Bruce Anderson's book, you can see that the pump has a venturi, but no screen.

The venturi/screen combo was added for the late SC, maybe get one and remove the venturi.

Pelican Parts - Product Information: 930-107-314-00-M253

jamesjedi · 09-07-2012, 06:12 AM

Here is a summary on 911 oil pumps. Scroll down to Henry Schmidts 4th post. It is an excellent summary on the different oil pumps. He may be the person to contact about the screen.

The picture of the 930 and 965 oil pumps do not have the screen.

Oil restricrors revisit

Walt Fricke · 09-07-2012, 02:45 PM

Tom - if you decide it is a paperweight, let me know and I'll send the $ for postage. I'm sure you can find the parts you need, or adapt something from some SC motor.

stownsen914 · 04-01-2023, 06:34 AM

Bumping this thread ... is it possible to adapt a later style pickup w/integral screen to this early style 930 oil pump?

Dpmulvan · 04-01-2023, 07:29 AM

Dpmulvan · 04-01-2023, 07:32 AM

stownsen914 · 04-01-2023, 09:12 AM

Thanks dpmulvan. I'd recalled the pics of the ones without the screen - forgot it was in Bruce Anderson's book. I found a pic of the venturi/no screen style pump with the separate screen. Apparently that type of screen is unavailable now. I think I prefer the later type with integrated screen.

I'd guess it should be possible to pull the tube/venturi and replace it with a later style one with integral screen. I'm inquiring here to hopefully confirm this possibility.

PeteKz · PeteKz's Garage

When I built my SC engine into a 3.2, I used a turbo crank to get the 74.4 stoke and the turbo pump. Part of why I chose this pump was because my SC pump was not scavenging the oil sufficiently, and I ended up with more oil in the case. I surmise that was because of wear in the pump, but particularly the scavenge section. I say "surmise" because I didn't measure the clearances between the pump gears and walls, and I don't know what those specs are anyway. But I knew that the turbo pump delivered more oil AND more scavenging, so that's what I favored. I also got a good package deal with the 930 crank and rods, so might as well take it too.

Since I had more oil flow I could use for cooling, I then opened the restrictor holes in the oil line fitting and cam housing oil tube by several numbered drill sizes to get more oil up to the top of the engine for more cooling of the head, because it's the hottest part of the engine. I also got the circular screen with the pump, and that fit neatly into the sump between the sump plate and the "dome" of the oil pickup. Remember this is a street car engine, so concerns about oil foaming and getting whipped around the crank at high RPM are not a big concern, whereas, for those of you building race motors, this may not be a good strategy. I figure that in a road car driving in the summer at 100+ degrees, or worse, in stop and go traffic, I want all the cooling I can get.

r lane · 04-04-2023, 06:14 AM

I have a similar setup as ludvikagard....minus the babbit. Correct Turbo pump for the mid year turbos, before the absent sump plate. If you can't locate the correct screen, I would attempt to make one out of a standard early NA strainer. I have several 3.2 pumps if you would be interested in a barter. Bob