Engine apart, looking at P&C's - what are my options?

[squidmarks]

Well, I ripped into the engine of the '82SC I bought a couple weeks ago. Although I've rebuilt a few motorcycle engines, I've never done a 911 engine before. So, with Wayne's books by my side, I started tearing it down. Although the engine was filthy, it came apart pretty easily. I was pleasantly surprised when I found all head studs intact - none broken. Then I got to the pistons and cylinders - not so pleasant. P/C #5 was severly scored along its skirt. The others, had some scoring, but to a much lesser degree. I have a feeling that they all will have to be tossed, but I haven't taken any measurements yet.

What are my options? Do I really need to spend $3000+, or are there less expensive options. A quick scan on ebay turned up a set of QSC (not familiar with this manufacturer) P&C for $1250. Has anyone used these before? Do used sets ever come up where someone is bumping up to a larger bore?

Thanks.

Geoff

Number 5 P&C are shown below

[Scott R]

Henry Schmidt at supertec racing sells the QSC jugs with pistons that he matches, call him about I did and I received a great education on the subject from Henry.

I involved in the same rebuild as you on my 80'. My pistons and jugs were shot, which is where my 30% cylinder leak was coming from. I found that the best option you have if you have Nikisil is to send them to be re-plated by EBS or US Chrome or LN Engineering. They install a new set of JE's at that time and you get them back pretty quick. EBS has 3.0L with warmed up compression for around $1700, and 3.0 >3.2 sets for around $2500.

Beyond that you have of course Mahle, which every wrech I have talked to says is still hands down the best option.

[YTNUKLR]

What kind of intake? What kind of cams? Do you have smog requirements?

If going stock cams/intake, used in-spec. Mahle is the cheapest, around $500-800.

If you are planning to use radical cams and carbs/MFI/ITB's (individual throttle bodies), then JE pistons ($900) + QSC/Mahle 3.2 (95mm)/bored Mahle 3.2 (98mm)/Perfect Bore/Nickies cylinders are the best bet. Radical cams + intake usually not compatible with smog requirements.

Mahle will last the longest, but won't allow you to make the most power.

PM me, I can set you up with various options ....

cheers
Scott

[squidmarks]

Scott,

I'm going stock, no performance upgrades.

I emailed you. Thanks for your response.

Geoff

[tctnd]

Geoff,
I have a new set of Mahles for sale; I PMd you.
regards,
Phil

[NoEardGoat]

If you have time, you call around to used parts sources, tons in the back of a copy of "Excellence" magazine. Also keep your eyes open on Pelican classifieds. I am in a similar situation and found a set from a fellow Pelican for 500 bucks.

I am no expert, this is my first Porsche engine as well, but a good set of used cylinders and pistons with new rings and the cylinders touched up with a grape hone should work. I don't think it is a 100% that the new rings will seat, but much better than 3000 bucks. Just make sure the used set has been measured to be withing specs.

[ChrisBennet]

Keep in mind that for the factory piston and cylinders there are:
- 4 different diameters ("tolerance groups")
- 4 different piston weight groups
- 2 different cylinder heights ("height groups")
And that's just for the Mahle, Koblesmidt (sp?) also supplied P&C's.

This makes replacing a single piston or P&C problematic. For that reason I'd go with a matched set of 6 P&Cs be it used or new.

-Chris