Tag Archives: “The Beast of Turin”

The Beast of Turin – The Rebirth of a 1729 Cubic Inch S.76 Fiat – Assembly of the Engine

  • S761
  • Test fit of the 7.50-inch diameter pistons

The Goodwood Festival of Speed is being held next week in the UK on June 26-29, and Duncan Pittaway and his helpers Bruce and Tucker are working very hard to get the S.76 Fiat ready and there on time. Stefan Marjoram was at Duncan’s shop on the weekend of June 8-9th and took this set of photos showing the installation of the intake valves, connecting rods, pistons, the block and the s.o.h.c. assembly.

The huge four cylinder engine has a 7.5-inch bore x 9.843-inch stroke with a 1729 c.i.d. (28 liters) and it produces 300-h.p; each cylinder displaces 432 c.i. Many thanks to Duncan and Stefan for sharing the rare sight of the engine internals with us.

The Old Motor has been following this project for the last three-plus years and you can take a look back here at eight posts on the S.76 Fiat; there you can see many more of Stefan’s images and art, period photographs and as much information about the cars as can be found.

As of yesterday they were still on target, but have lots of plumbing and last minute details to attend to. Take a moment to visit with Stefan Marjoram and also learn all about The Festival of Speed. Stay tuned for a follow up.

  • S762      S763      S764
  • The crankcase, crankshaft, flywheel and connecting rods
  • S765      S766      S768
  • Installing the caged single intake valves, test fit of the block and pistons
  • S769
  • Installing the three camshaft bearing towers
  • 14435710892_684d036802_o      14433691601_a5e81bce12_o      S7611
  • Installing the s.o.h.c and the shaft and gear assembly
  • S7612      S7613      S7614
  • The oil pump – transmission-differential – cam bearing towers
  • S7615A period photo of one of the two S.76 Fiats
Posted in Auto Racing 1894 - 1942, Post-War Contemporary Photos | Tagged , , , , , |

*Updated* “The Beast of Turin Revisited”, the Fiat S.76 racing car

A photo of the Fiat S.76 racing car (above), surfaced recently that we have not seen before, courtesy of  Chamon Vincent. This photo gives you a new perspective into the size of the 28 litre engine, which was installed into the “The Beast of Turin” as it was called.

Duncan Pittaway, from the UK  who owns the S.76 car that he is working on (follow these two links to see the progress. Link one….. Link two). He has provided us with all of the differences here between the racing motors and the airship motors:

The car engines were made at the end of 1910/very early 1911. The airship engines for Forlanini were not made until 1912 and were supplied in left and right hand rotating pairs. The airship engines only shared the same bore and stroke. The crankcases were cast iron with no “legs” to mount into a chassis, a big square oil sump, the cam and mag drive was at the opposite end, not the flywheel end like the car, the block had 8 valves instead of 12, the oil pump was driven from the nose of the crank instead of the cam drive, the compression ratio was very low and, as the airship engines had compressed air start, they didn’t need a complicated sliding decompression cam like the car, which was started on a handle from the front of the crank.

Fiat has a “clockwise” airship engine at Centro Storica, and Politechnico di Torino have an “anti clock” version…. I’ve been lucky enough to look at both. They’re both dated 1912, are slightly different and I don’t think they have any interchangeable parts with the car engine whatsoever.

These engines if the specifications we found are correct, turn out to have a bore and stroke of very close to 7 1/2″ x 9 27/32″ (19.0 cm x 25.0 cm ). That works out to 1729 c.i. total or 432 c.i. per cylinder which is bigger than most big V-8 engines in total. You can take a quick look back on previous coverage here on The Old Motor showing many S.76 photos and other information, including an incredible ongoing effort to reconstruct a  Fiat S.76 from an S.76 racing engine that came from Fiat and other parts that have survived.

Above are two of the S.76 engines mounted side-by-side and set up to drive right-angle  gearboxes. They powered a Forlanini F.5 dirigible, seen in the (bottom) photo. From what we were able to find out about them, a few of these dirigibles were used in the war between Italy and Turkey between 1911-1912. Later air ships appear to have been powered by smaller Fiat engines. Photos of the engines (above) and the craft at the  (bottom) courtesy of  jn.passieux.free.fr

The photo just below is from The New York Times Mid-Week Pictorial, dated Jan. 31, 1918. It shows what they call “the car” of one of the period Forlanini airships were the power plant above was located. Full details of the craft can be found in the periodical.

Posted in Auto photos 1885 - 1920, Auto Racing 1894 - 1942 | Tagged , , |