I say sportiva
Ah, yes, Ruedi. This car was the first Alfa I had ever seen, the cause of all this terrible disease I have suffered since. In my delerium I was not all that careful and observant. So I obviously knew so little about Alfa Romeo in those days that I had never heard of any sportiva engine. I learned about that engine only years later. But I know the car was the two liter Factory Demonstrator left over from when they were showing the body style before they started the run of regular two liter cars. It was purchased in December 1959 at the factor in Milan. It was clearly NOT one of the standard run ones already being manifactures which featured what is now the standard 102 engine with "neutered" solex PHH44 carbs. Why Alfa used those carbs will always be a mystery. I have heard that they owed Weber money, that weber refused to sell to them, and they had to get another source. I doubt that. I suspect there was a sudden jump in gas prices and the solex carbs running on siamesed intake manifold which fed two cylinders from the primary side most of the time got better gas mileage. They were going to be driving cars rather than racing cars anyway.
My ski patroller friend (we called him "Trozzi" or "Trotzy", but now know it was spelled Trossi) bought it as "the fastest and newest Alfa available" at the Milan factory on a three day pass from Bergtesgaden, using the influence of his uncle, an actual former race driver for Alfa Romeo named Trossi who used to race Alfas back in the early days along with Enzo Ferrari. He is mentioned in literature as developing a streamlined early Mercedes too. From the way my buddy told me the story of how he got the car, however, I gained the impression that possibly his "Uncle Pinky" from Palermo had mafia connections. The factory guys were told he was going to call to see that he got the car (and he did get the car). Trozzi was no car nut. He only wanted a car so he could attract more girls. He felt the seargent was cutting a huge swath with his TR-3. I ended up being involved only because he got a flat tire on the left side and did not realize there were left hand threads. He asked me afterwards to be his mechanic. I accepted only because that meant I got to ride around in the car and sometimes drive it. I later also realized that he had become aware that German girls seemed to always be in pairs and "pickups" would be easier with two guys. We would troll up and down until we had a strike. Then I would have to sit sideways in back so he could shift the knees of both girls. He would finally turn into a gast haus (to get some Vat 69 which he swore worked best to really get to know girls), and throw me the keys. I would drive around in that wonderful car and come back later, sometimes to find he had left me a message to pick him up in the morning, or on the following Monday morning. I drove all over, and could pass cars passing cars on the autobahn. I tell you no two liter since has ever been so hot. There had to be something special about that engine.
I guess I should tell you what finally happend to Trozzi, but I must be terse in this respectable forum. Suffice to say he was peremtorily courtmartialed one afternoon (Colonel himself came to get him off the ski slope) and kicked off the ski patrol for being too successful and perhaps too fertile (with two gals, sisters to each other, for cripes sake). I never saw him or the car ever again.
But as to the engine. It most certainly HAD webers, and not any lousy solex carbs. And it did have the exterior oil pump. And it was hotter than any of the twelve two liter spiders I have had since. Look at the photo of the sportiva engine that you show, Ruedi. It has Webers. The lines on the top of the cold air box run to the air inlet on the outside end just as on the older weber applications such as on the 3000 car Harold Wessel once had. Those are not the same as our current DCOE carburetors, but an earlier version. As for the interior bore and stroke dimensions and compression ratios I cannot say. It certainly looks like a bored out 1900 block. The Sportiva engine had been developed before the two liter, and were avaialble even if they finally did use a standard 1900 block with a modified head for the first 432 of the 102 series engines. Alfa was scrambling then for some good sales of some kind, and never hit the bullseye until the Giulietta. Even the Giulia with 1600 engine made the 2600 less desireable. I remember when they had to deeply discount and almost give the last of the 2600 spiders away because people preferred the smaller more nimble Giulias.
So, if one might now put a RIO 2300 with its weber carburetors and other improvements into a two liter spider one might get a little closer to the factory demonstrator. The two liter could have been a car that would probably have become a legend and respected and long remembered if the factory had decided to really sell it to the public with a sportiva engine. Instead they emasculated (i.e. surgically neutered) the car, foisting it with solex PHH44 carburetors upon the public hungry for a new car, using 1900 engine blocks to get started. After 30 years of tinkering and finally modifying intake manifold and using DCOE webers I got rid of the log some guys with Giuliettas would suggest two liters were always dragging. But it still oil starves my engine on long hard turns where the hot oil runs to the side of the pan so the pump sucks air. It could use the external oil pump and an oil reservoir. What a waste! A sportiva engine would have bolted riight in, just like a RIO 2300 would today.
Wonder where Trozzi finally did with that car, or if it still exists. I once thought his car chassis # would have been AR 10204*00016 since I was told that the first 15 numbers were reserved for cars done by special builders like Pinanfarina, Vignale, etc. But then in the last couple years I noticed that Drew Dawson, who is constantly buying and reselling these old cars, sold a completely stock two liter with chassis number AR 10204*00013. So that theory is all wet. Face it, I guess I really don't know much about all this, and can only surmise. Maybe you should just write down all of this on potty paper and use it for appropriate purposes. However, I do know the demonstrator car had webers, had exernal oil pump and reservoir, and went like stink. I can't blame the factory people for wanting to have the demonstrator car something worth remembering if someone came to try it out. They wanted to sell cars. Clearly the decision as to the body was ready long before any final decision on the engine. Someopne knew they had the sportiva engine available and thought that would be a neat idea. What would be more perfect. If only . . .
[B]JAY NUXOLL [/B][EMAIL="email@example.com"], seriously Alfa diseased and ancient OLD Two Liter Lover, put together Seattle area's Northwest Alfa Romeo Club in 1965, and still feebly tries to tend a teeny sacred flame to his serpent mistress in the [B]ALFA G'RAJ MAHAL[/B], a home garage temple with more Alfa cars and parts than he dare list because of the disapproval of his shamed and chagrined family. (425) 641-2600.