68L engine rebuild at PCM

[mario lanza]

Dropped off US 911L at PCM for first going over.

Good news was told it was 2nd one built and maybe a show car in US - they are researching car.

Alloy engine cases.

Bad news was the S upgrades were not done properly.
No IDS Webers which I knew. But S spec heads ok.
Cam was more aggressive than S cam which will be brought back to S spec.

So full tear down to ensure bottom end can cope with new mahle S pistons and barrels.
Galleries to be checked that oil mods are right for Carrera tensioners.
Distributor to be rebuilt. New flywheel too. Nitrided rocker shafts also needed.

Peter is a great person to deal with on the car.

[Classic]

Mmmmm nice

[9er]

Nice pics Mario.
Is that galling between the cylinder head and the top of the barrel?

[mario lanza]

not sure what galling is!? to quote miss Hanson of One Nation please explain?!

[Terminator]

Is PCM Porsche Cars Melbourne?

[9er]

not sure what galling is!? to quote miss Hanson of One Nation please explain?!

I was tempted to look it up so that I would seem clever but I think it is what you get when two materials in contact with each under pressure move and cause damage to the surface?
Your pics seem to show damage at the contact point between the cylinder head and the barrel, on a couple of the photos, I guess just ordinary corrosion could be another cause?

[PCM911T]

PCM trying to break into the Porsche Classic market, not going to be "reasonably priced" then.
Paul M

[mario lanza]

Yes Clyde Porsche at Melbourne.

Peter has been wonderful on Carrera and now this car.

On pricing they are trying to get parts at special pricing with PCA involved as they said 1.5 years ago that they want us back in the dealership for PR reasons.

I accept we have lots of great independents too.

Sold my rough green 70 targa with 2.4 t/e for $51.5k tonight to someone with reputedly over 20 901 cars in warehouse.

Will get back to you guys on corrosion question after asking Peter!

[Terminator]

They have a lower "Classic labour rate" only $135 an hour I think

[Cairns888]

Yes Clyde Porsche at Melbourne.

Peter has been wonderful on Carrera and now this car.

On pricing they are trying to get parts at special pricing with PCA involved as they said 1.5 years ago that they want us back in the dealership for PR reasons.

I accept we have lots of great independents too.

Sold my rough green 70 targa with 2.4 t/e for $51.5k tonight to someone with reputedly over 20 901 cars in warehouse.

Will get back to you guys on corrosion question after asking Peter!

Did you have that car on here for sale Mario? I must of missed it. 20 early 901's hey. Collecting for a rainy day they must

[mario lanza]

No did not advertise car as it was not for sale! I think the informal rule for members of advertising at least first on the forum is a wonderful rule. But i wrote off the family car and someone knocked on the door of a friends house when the car was out the front. I had been told by others of someone in the north from a particular background with that many 911's and i was sceptical but he literally knocked on the door at a dinner. I do expect that the cars are not top tier cars as mine was a rough car but i do expect his motto of "they are my super" is genuine. For what its worth i think he loves his cars - as an aside. I do apologise if the process i adopted was not right.

I have scott mcpherson's 70t targa also sitting idle if that floats your boat!

[griffiths_r]

I say 'no harm, no foul'. If someone knocks on your door cold and offers an attractive number no one in their right mind would expect you to say 'hang on, i just need to put it up for sale on my club's website forst'!!!

[Cairns888]

Not implying anything mate. Cash is king and most cars these days don't get advertised. I thought I may have missed it.
Seems a good price.
Scotty gets around doesn't he!!!

[reedminor]

I'll be following thins with interest Mario....

jr

[mario lanza]

Next chapter in PCM 2.0 engine rebuild.

Cases great - no machining no line boring. See half case photo 1. Alloy looks like new!

Bottom end is great - journals great and bearings too - no undersize / concentricity . Note counterweighted crank. Ready for S top end. See photo 2.

S heads in solvent bath. See photo 3.


PISTON AND CYLINDER CHOICE ?

OPTION 1 - bore the steel barrels to 80.5mm and put in Wossner forged racing pistons - approx $1,500 plus machining costs

OPTION 2 - LN Nickies - US made alloy pistons and cylinders - with alleged extra heat dissipation - approx $5k

OPTION 3 - MAHLE OEM style S forged pistons and cylinders with alloy nicasil cylinders - approx $5-8k


Peter, was most concerned with heat transfer, and given no external rad (as per S) thought best to stay away from the Wossner option even though they are a top piston.

LN was regarded as a good product but the claimed heat benefit of Nickies perhaps was thought to be in comparison to a non alloy porsche barrel!

So quick search for Mahle motorsport S pistons and cylinders in 80mm (forged, alloy and nicasil coated) showed prices from about $4,800 to $7,500. Order made from Euro supplier as U.S. suppliers were far pricier.


DRIVEABILITY V. ORIGINALITY ?

A prominent L owner and I discussed the 2.2 piston option ( the additional cc and torque on an S cam would be more driveable) but I felt the SWB and 2.0 displacement was a key signature of the early cars. No right answer here i guess.

Another drivability option was a less aggressive spec cam - obviously an E cam coming to mind. Peter at PCM felt that the S heads need the more aggressive cam to breathe correctly - so no compromise there either?

Well, to prove i am not a pedant we are keeping the carrera tensioners - but the block is being modified to ensure they get the correct oil pressure which sometimes is overlooked (as on this one). Soo to the oil pump.


Any questions or suggestions welcomed.