Quote:
Originally Posted by JohnAh
One way of reducing both pumping losses and friction is to remove some pistons and keep the corresponding valves closed. I did so with a little Fiat 127 some years ago, with 10-15% improved fuel efficiency. -Despite a lot more driving in high RPM:s to make up for the halved torque and rough running at low RPM. One thing I noticed shortly after the modification was that engine braking was decreased a LOT.
The resulting 525cc two cylinder engine with slightly above 20hp was probably a bit to the tiniest for efficient driving, since the need for hight RPM:s to get the power needed kept pushing the engine away and up from the BSFC sweet spot. In a modern car with more power margins I guess the increase in fuel efficiency could be a bit higher
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Makes me remember when I was at 7th grade and lurked about dropping a Honda CB500 engine into some small car.