964 oil pump

[thor]

hello
is it possible to use a 964 oil pump for a 69' engine ?
I think but I m not sure .
thanks.

[126coupe]

Yes, but its longer than the stock pump the webbing inside the case has to be modified by a qualified machine shop to accept the pump

[Henry Schmidt]

When retrofitting a late pump in an early engine you are better off using a 3.0 or 3.2 pump. They fit properly and they are more durable and cheaper than a 3.6 pump. If you are lucky enough the find a 3.0 pump you can even use the stock sump cover. The retrofit sump cover for 3.2 and 3.6 pumps do not come with drain plugs ( although we add one if desired.)
The 3.6 pump is larger but it is made of magnesium and we've seen quite a few cracked housings that we do not see in 3.0 and 3.2 pumps with far greater miles on them.

[TimT]

Yes..

I have a late 930 pump in my 2.2

you can get even later pumps to fit.. like a GT3 pump.... but its overkill..

The 964 pump will fit

[Henry Schmidt]

I agree, it will fit. The point is that it is not the best option. Sometimes bigger is not better. When someone asks a question about doing a job, it makes sense to give advice if the requested work could be done better.
Could you use a car trailer to transport a horse? Sure, but I would advise againt it.
3.6 pumps are failing at alarming rates. 3.0 and 3.2 pumps rarely fail and fit better. You choose

[KobaltBlau]

Nice Insight. Nobdy wants their oil pump cracking open!

[thor]

thanks a lot , I will put a 3.0 or 3.2 pump !!!

[Tinker]

Henry,

Are the 964 pump failures predominantly occuring in 964 type motors or motors with the 74.4mm cranks?

Tinker

[Henry Schmidt]

Most of the Carrera II pumps we see come from 964 and 993 engines, of coarse because that's what they come in. Because we do not see them in earlier engines that often it stands to reason that failures would be predominately seen in high mileage engines that come with this pump. However there is no reason to believe the failures are in anyway related to crank configuration. That is unless you're suggesting that the failures are related to engine vibration caused by the inherent imbalance of the 3.6 engine.

[Tinker]

Henry,

By failure, do you mean cracking in the magnesium housing?

Tinker

[Henry Schmidt]

Originally posted by Tinker
Henry,

By failure, do you mean cracking in the magnesium housing?

Tinker

Yes, that is exactly what we are seeing.
To date 6 pumps. I have never seen a 3.0, 3.2 or Turbo pump with cracks like these.

[Tinker]

Henry,

Have you noted how close the rod end cap on the number six cylinder comes to the body of the oil pump on the 76.4 mm cranks.

My hypothesis is that the clearance between these two parts is so close that any imbalances in the crank or slight stretching of the rod bolts, at high rpm, results in a slightest contact between the end cap and the pump resulting in a cracked pump.

Thoughts?

Have you ever noted a oil pump crack in a motor with a 76.4 crank and raceware rod bolts?

Is the pump failure noticeable by a drop in oil pressure, noise or just discover at rebuild time?

Tinker

[Henry Schmidt]

I have not noticed any sign of contact. Although the rods get very close, the pump is notched and I believe there is sufficient clearance. The problem seems more like design flaw in the housing. The magnesium is very thin and under pressure. Sorry no broken ones to show you, we usually give old, broken parts the heave.

[rick conrath]

So given the choice...you would pick a 930 oil pump over a stock 993 oil pump?
Rick
'78 930

[Henry Schmidt]

oooops

[Henry Schmidt]

If price was no object, there's no doubt I would run 930 oil pumps in everything. But let's face it money is always a consideration not the most important factor but a factor never the less..

[rick conrath]

So I guess I should pull the one out of my 930 engine.
Rick
'78 930

[Henry Schmidt]

Hi Rick
It is never my intention to tell you your "baby is ugly". All babies are cute. In your case if it works don't worry about it. You will probably take your engine apart for something else before your pump fails.