[Jim Williams]

Hansv,

Well, you came to right place.......

I have one in my garage being rebuilt as I type this. Since I cannot trace the car's journey from the factory to me, I cannot verify that the engine as I bought it represents what the factory produced, but I believe that it does.

Since I don't read French, I have no idea what the the first link's description is telling us. I do recognize some of the numbers, like 97.

Since the second link is, I think, a Belgian site, a few words seem to have been invented by the author, but they seem to sort of make sense.

I bought the engine sight unseen, as a rebuilt 3.0 liter. It was not a 3.0, nor was it rebuilt. The seller had no idea what he was selling, and I of course, had no idea what I had bought when I opened the crate. When I related to him what I found when I uncrated the engine, he apparently thought I was making a lot of it up, and refused to hear any more. I wanted to send the engine back, but he would have none of it. At this point, I had never heard of a 3.1 liter engine, and thought I had bought some something put together with some leftover parts. There is more of the story, but it is not pertinent to your question.

I have taken a lot of photos of the engine as it came apart, and have more as it is going back together. I can post some of the photos if there is any interest. The engine number stamped on the case verifies the 3.1 configuration. I cc'ed the engine and calculated a 9.8 compression ratio. The actual numbers could be 9.5, but I feel pretty good about my number. The CIS components appear to be mostly stock for a '79 SC except for the Fuel Distributor, which has numbers on it I have never seen before, and I've seen a lot of CIS engines.

It came to me with the pressure-fed chain tensioners, but I assumed they had been added to the engine, as I was unaware that these tensioners were in exsistence 5 years before they appeared on the '84 cars.

The exhaust system on the engine as received appeared to be a severely rusted stock SC set of heat exchangers with no heater boxes. These promptly went into the trash heap.

Oh, and I can verify the 97 mm cylinders (with the higher compression pistons).

I have a performance graph which Mr. Adrian Streather (author of the SC book, The Essential Companion) sent me. He said that he heard rumors that Porsche produced such an engine but had no verification of it until I told him of the one I have. The HP curve does peak at 210.

I am putting the engine back together stock except for 964 cams which I hope will allow enough piston-to-valve clearance with the higher dome pistons. The cams in the engine were stock SC.


(Edited to correct some spelling errors)