964/930 oil pump

[JW2000]

Hi, Rebuilding a 930 3.3 turbo. I noticed it was running with a 964 oil pump..not the 930 pump. Is that ok? or not a good idea?

If its fine, Im assuming I still use the standard pressure springs from the 930?

thanks

[gled49]

The pressure segment of the 930 pump was enlarged 19% to deal with all the extra oil supply items, like larger piston squirters and turbo supply. The scavenger side of the 964 oil pump is the same as the 930.

[JW2000]

ok thanks... Does anyone know if the gt3 oil pump would fit into the 79 turbo case without any mods? I read something about having to update the flywheel seal due to the extra vacuum created?
I might be able to get my hands on a used one.

thanks

[colingreene]

Unless you are road racing the car I dont see the benefit in adding the GT3 pump.
Or running at sustained high RPM.

[JW2000]

Understood, However, not really concerned about the benefits over a 930 pump. ... just might be able to get a used gt3 pump for a fair price instead of buying a new costly 930 pump

so any fitment concerns?

[Evan Fullerton]

996 Turbo pump was cheaper than GT3 last I looked. GT3 pump requires some case machining to fit due to the secondary scavenging pickup, not sure about the 996 Turbo pump.

[gled49]

The GT3 pump does need some case clearancing if not mistaken. It adds an additional scavenger section but pressure side is the same as turbo. You don’t need one.

[HaroldMHedge]

Bill Verburg gives us flow rates of the Turbo 3.3 and 964 oil pumps.

When to use a GT3 vs 930 pump?

Originally Posted by Bill Verburg

930 vs Carrera


GT3 vs SC


GT3 vs 964/993


Specs, sorry can't find the 930 scavenge side spec


the gt3 pump has 2 scavange sections the others 1

GT3 oil pump

Originally Posted by Bill Verburg

the 964 pump pressure side is 65l/m & 120l/min on the scavange side

3.3 930 is 100 l/min & & ? on scavenge
GT3 is 83/ l/min &135 l/min

GT1 is 83/l/min & 160 l/min

all the dry sumps run at a partial vacuum, the seals on the gt3 are designed to support a deeper vac and RSR even more