You absolutely can make a smaller engine and say it will get better fuel economy.
If you look at an efficiency map of the engine, large naturally aspirated engines operate pretty far off the sweet spot under light load of normal driving. Smaller the engine the closer you can get to the lowest brake specific fuel consumption. This is principal behind the cylinder deactivation on the various v-8's, they improve the engine efficiency at low hp requirements by increasing the operating pressures/temperatures in the remaining cylinders. Even while suffering the friction loss of spinning 4 dead cylinders around it still improves efficiency.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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