Originally Posted by boostbros

...580 gallons of fuel per hour at takeoff power, ....

Originally Posted by rjcardinal

Looks like it is too wide for a side by side installation. Just think no valve tran problems. Can you say 6500 rpm?

Ron

Originally Posted by boostbros

a little history here they were making 3500 hp out of 1750 ci with 4 valves per cylinder in ww2(compound turbosupercharging) they today still are the only piston engine that can run the big speed of the unlimiteds...my favorite is this one if i could figure out how to get it in a boat !... the lycolming 7755!This behemoth is the largest piston aircraft engine ever built in the free world. From 7,755 cubic inches (bore of 6.375", stroke of 6.75") and 7,050 lbs it gave 5,000 horsepower under test in 1944; 7,000 horsepower was the development target. Nine liquid cooled inline four cylinder engines about a common crankshaft. Two contra-rotating prop shafts. The camshafts each consisted of two sets of lobes. One set of lobes for takeoff, the other for economy cruise. The camshafts were shifted axially to switch lobe sets. 580 gallons of fuel per hour at takeoff power, BSFC of 0.43 at cruise. Paul McBride of Lycoming says it was for the B-36 but political pressures caused the B-36 to be fitted with the Pratt & Whitney R-4360 instead. Awesome. A survivor still exists at the Smithsonian's Garber facility. See it if you can. Circa ..

Originally Posted by boostbros

RIK ..... The drives on Blackcloud worked perfect its not easy turning one engine and blower backwards but with a lot of labeling and arrows and head scratching..... we got to test. it is brutaly fast .