996 oil pump in early 2.0 case ?

[Oddmund]

I know that both the gt3 and the Turbo oil pump will fit my early case. I can purchase a new 996 pump for a decent price. Will there be any problems using this pump? I am going to perform the oil bypass modification and have piston squirters installed.

Oddmund

[304065]

It won't fit without machining the case. This is simple, however, and can be done when you do the oil bypass mod and the squirters. Also, the fixed venturi and screen will require the use of a dished oil sump screen, only a problem if you are doing concours and wish to retain original appearance.

You can see where the main bearing web was relieved for a larger pump, this is an SC pump but there's clearance for a Turbo or GT3.

[Oddmund]

Thanks John. Then I have to decide if i will go for the turbo pump or this one.
The engine are going to be a short stroke 2.7 using 66mm CW crank, 93mm LN nickies, DC 40s, 10.5-1, lightweight JEs, mfi, twin plug heads, electromotiv ignition etc - a little more grinding will not make any difference

Oddmund

[Eagledriver]

I had no idea the 996 uses the same style pump as our early engines. The only issue I see from you picture is the pick-up will probably need to be swaped out with the one from your old pump. That one is meant for a later case with no sump plate.

-Andy

[304065]

A late style plate is used.

[kenikh]

I thought that the GT3 was the only H2O car that used the same type oil pump. Interesting.

[Oddmund]

The part number for the pump is 996 107 008 70 - and it will fit both 964 and 911 Turbo I have been told.

[Oddmund]

Update - at last. Oil pump from 996, intermediate shaft from 964 - alu block from ´66.
The original intermediate shaft was to long. Just for the record if anyone will use this pump for their build.

[Lukesportsman]

Does anyone know where this pump falls in the range of pumps? So we have the GT3 and Turbo at top, but then there's the 993/964, 3.2, ........ Could this be the bargain pump for most rebuilds?

Appreciate the photos and updates. Never would have thought that 996 engine's pump would interchange for our dry sump cars.

[sjf911]

Originally Posted by Lukesportsman

Does anyone know where this pump falls in the range of pumps? So we have the GT3 and Turbo at top, but then there's the 993/964, 3.2, ........ Could this be the bargain pump for most rebuilds?

Appreciate the photos and updates. Never would have thought that 996 engine's pump would interchange for our dry sump cars.

1+ This looks like a great choice for a street motor.

[Tom Sch]

hello,

here you can see a 996 GT3 oilpump in a 3.0 case...
...will fit with minimal mods!

[YTNUKLR]

Top - GT3 (notice the extra scavenge section directly beneath the pump body)

#2) 930 3.3 (Half cast-iron housing, less expansion, less pressure loss)

#3) 996 Turbo/GT2, 993 Turbo (same size as GT3, 930 but solid aluminum housing, no cast-iron - see Oddmund's photo above)

#4) 964 is magnesium - I won't use them

#5) 3.2 / SC (same internally, different sump pick-up)

For the money, the 996 Turbo pump is best, unless you get a good deal on a 930-3.3 pump. The GT3 pump is "best" but generally is *not* necessary.

The 996/997 "Carrera" variants CANNOT be used. The only 996 pumps that work are from the TURBO and GT3

For comparison this is a 930-3.3 (left) pump next to a GT3 (Right)

[YTNUKLR]

Originally Posted by sjf911

1+ This looks like a great choice for a street motor.

Totally not necessary for a street N/A motor. but, it's your money.

[sjf911]

I meant street turbo. The 996 new is about as expensive as a used 930 pump.

[YTNUKLR]

PM me re: where you find that deal?

[Steve@Rennsport]

Originally Posted by YTNUKLR

Top - GT3 (notice the extra scavenge section directly beneath the pump body)

#2) 930 3.3 (Half cast-iron housing, less expansion, less pressure loss)

#3) 996 Turbo/GT2, 993 Turbo (same size as GT3, 930 but solid aluminum housing, no cast-iron - see Oddmund's photo above)

#4) 964 is magnesium - I won't use them

#5) 3.2 / SC (same internally, different sump pick-up)

For the money, the 996 Turbo pump is best, unless you get a good deal on a 930-3.3 pump. The GT3 pump is "best" but generally is *not* necessary.

The 996/997 "Carrera" variants CANNOT be used. The only 996 pumps that work are from the TURBO and GT3

For comparison this is a 930-3.3 (left) pump next to a GT3 (Right)

Well said,....

[Cupcar]

I like to think of the 911 oil pumps in terms of their pumping characteristic as classified by their drive shaft:

"Short driveshaft" and "Long driveshaft" pumps.

Long Driveshaft Pumps

Normally aspirated 911s from 1965 to 1975; these use a pump with a 35 mm long pressure pump gear section and a 66 mm long scavenge pump gear section.

Normally aspirated 911s from 1976 2.7 liter to the 1989 3.2 liter, 3.0 Turbo; these use a 43 mm long pressure pump gear section and a 58 mm long scavenge pump gear section (more pressure pump, less scavenge pump than earlier pump above, hence the need for the oil bypass change in crankcase).

Short Driveshaft Pumps

Short driveshaft pumps have a 51 mm pressure pump gear section and an 80 mm scavenge pump gear section.

These were used in 1978-1998 3.3 Turbos, all normally aspirated 1989-1998 3.6 & 3.8, plus the 996 Turbo, GT2 and GT3 engines.

Of course all the above come in several variants each i.e. magnesium versus aluminum versus cast iron materials. With or without the intake screen attached. With or without the double scavenge intake in the GT3, etc.

[tadd]

So if one was to use a GT3 pump in an early aluminum case, is the oil bypass mod necessary?

[Cupcar]

Originally Posted by tadd

So if one was to use a GT3 pump in an early aluminum case, is the oil bypass mod necessary?

Interesting question.

No case since the mid 70's has not had the oil bypass plugged, including the GT3 case, so I would say the answer is YES, the mod is necessary.

Besides, I think you want to have a little oil in the case as possible to cut down on windage losses, I think it is a good idea with any oil pump.

[tadd]

cupcar:
Thanks for the reply... so my twisted logic was that given the size of the scavange pump how much would oil would actaually be in the case? Wouldn't having more oil flowing thru the scavange circuit actually improve cooling in the oil cooler (the coolers are on the 'foamy' side right - but for the engine mounted cooler which is pressure)?

I've been trying to find all the opinions on pressure side vs scavange side coolers... and I had a thought...

t