r-mm

I like your plan and agree - its a fantastic engine just as it left the factory. I'd make the case to keep the P&C if they really are in spec. You can buy name brand replacements but they will be just that and one never knows if the quality etc is the same. Whats a set of P&C cost? Might it not equal or approach the labor cost to replace yours should it need them in the future? I opened my 3.2 motor at maybe 130k and found no perceptible wear to P&C. Porsche / Mahle got that dead on. While they buggered the valve guides and head studs
When I opened my 964 motor this time last year I replaced the rings and left the P/C and have a nice tight strong motor that doesn't use any oil.

misterbeverlyhills

Based on what the machine shop suggests I went with new Mahle 3.6:

Clean / Inspect & Evaluate 964 Pistons and Cylinders. ( They are
OE Mahle Nikasil. But are @ the W.L. for Ovality. They may
perform once new rings are installed. But there IS Risk of
"Cold-Start" Smoking. If budget allows? We suggest replacement

I was so lucky with the rest of the expensive parts being in good condition I just don't want to risk having an issue using marginal parts. I got a good deal on the new set which the Machine shop will test prior to installation. I want a rebuilt motor not a refresh; the parts we are reusing such as the crank and cams will be polished, the oil pump was like new (the benefits of frequent oil changes) anything else that doesn't test perfect will be replaced with OEM.

John McM

If I had my engine out again I would seriously look at adding a second filter like the 993. I don’t think Porsche were that smart to leave the engine vulnerable to items entering the oil system post filter. They get straight into the engine ala Deserion’s case and kill bearings.

misterbeverlyhills

^^^ Yes I looked into that exactly, in fact Turner I think makes a bracket for the filter but there is a fair amount of plumbing needed according to my mechanic, not just a bolt on.

jeff33702

Yes the 993 filter console is on my list too..

Good luck with the rebuild!

joerg65

I’d be interested to know what your oil consumption is like for the first few thousand miles after the rebuild. I installed new Mahle p&c’s and despite following a proper post rebuild run in it was using around 1lt per 1000kms - this obviously had me pretty concerned. According to a local Porsche mechanic, these nikasil cylinders and rings are incredibly hard and take several thousand miles to bed in. I’ve now done 6,000kms and there’s near zero oil consumption and the engine revs effortlessly.

luv2race

Looking forward to the results.

r-mm

I also had reasonably high oil consumption for the first couple oil changes it then settled down.

misterbeverlyhills

Haven't gotten that far yet but from previous experience, a different oil is used for break in (1000 Miles) then drained and the long term oil filled and valves adjusted. I had a 70T that smoked like a chimney for about 500 miles and then was the smoothest 911 I have ever owned.

Here is a debate team question: Break in. Do you drive it hard from day 1 (once it warms up) or do you keep it under 4000 rpm till the 1000 mile service?

joerg65

It may not matter either way but to me, letting the parts get to know each other for the first 1,000miles makes sense. It isn’t going to cause any harm other than maybe extend the run in period, cost you a bit more oil and exercise your self control!

Scott Dunavant

After your break in oil is removed I would think you can drive her hard.

CBA

Good stuff. I consulted with Steve on my 3.2 SS in my '74. It was the best money I've spent to validate all the information that we get bombarded with during a rebuild. I think you are right on track keeping it w/ stock spec. I have a feeling you will do just fine with your build and your pricing will be reasonable (at least according to the Porsche Community)

Peteinjp

No special plumbing is required to addd the 993 filter console. I’m adding it on my build. Just need the console, a turbo thermostat housing and supposedly need to add a spacer to one of the pressure release valves.

Pete

JasonAndreas

Curious to know if anyone quoted you just to fix the oil leaks?

misterbeverlyhills

Perhaps plumbing was a poor choice of words but it is not a simple thing to do and the need for it isn't pressing. The reason th3 993 got 2 filters is because of the hydraulic lifters, first time on a 911. Much more sensitive to particle debris. My motor showed no sign of any debris so will go with stock again.