How much difference was there between the Scarab and 3-litre Offenhauser engines - apart from the capacity, of course. I believe they were both designed by Leo Goossen. Did the Offenhauser have desmodromic valves?
Was the 3-litre Offenhauser used anywhere else?
I understand that the Scarab was tested with an Offenhauser before the Scarab engine was ready. Was this the 3-litre or did they use a 4.2?
I don't think it is the 3 liter Offenhauser as you have in mind but there have been some 3 liter Offies being used before the Scarab.
Back in 1952 there were some experiments with supercharged 3 liter Offenhausers at Indy. Andy Linden qualified one in the middle of the first row that year but was the first retirement.
I don't know if this 3 liter has been any inspiration for the Scarab engine, maybe could share parts???
That race of 1952 was, at least within Indy history a unique one because in no other years (edit during the 50's EndEdit) there were so many different engine configurations within the starting field, and four ot those were used witin the first four qualifiers!
1 (pole) Straight six turbocharged diesel
2 Supercharged 3 liter Stright 4 Offenhauser
3 standard unblown 4.5 liter Offenhauser
4 Supercharged 3 liter Novi V8.
....... and way back in the field there was the unblown 4.5 liter Ferrari V12........
BTW, Herb Porter fielded a supercharged Offy in the years between 1957 and 1959 but rules mandated that blown engines then had a capacity of 2.8 liters. Rodger ward was one of the drivers of that car,
Edit2: I forgot to mention but there were 4 such supercharged Offenhausers in the 1951 race but deemed no success because (as I have read) while they were more powerful, they lacked the torque of the unblown 4.5 liters which helped those cars to accellerate out of the corners much better than the supercharged ones and thus made the unblown engined cars easier to drive than the blown engines. Hence the fact that one year later only Linden still drove for a team that tried its luck with a blown Offy.
EndEdit2.
Henri
Edited by Henri Greuter, 14 October 2017 - 09:50.