Ultimate Jensen-Healey Lotusbits 907/912 2nd Dyno Run 250hp

The second dyno run of my Lotusbits built (UK) 907/912 engine for my Ultimate Jensen Healey project. Forty years in the making, this is the last piece. The engine is from 1972, with some structural upgrades to the block which anyone but Colin Chapman would done from the beginning and even he eventually redesigned the block to make it stronger [the Lotus 912 block]. The cylinder head is the same 4-valve head from 1972. I could have bought a 300 hp engine from Lotusbits but I preferred a high torque at low rpm street engine to a high rpm/hp - low torque racing engine. Even Honda figured out the same thing on the S2000 and went with a 2.2 crankshaft, just like Lotus did with the 907 20 years earlier. Lotusbits just took it one logical step further and stroked the 907 to 2.5 liters. Still over square.

Added 19 Aug 2026