Small engines are not neccessarily more efficient at 1500 rpm. Sometimes that's too slow to make power.
I have a '98 F-150 with the small V-8, where the horsepower peak is at 4700 rpm. At 1500 rpm it was lugging. No guts. And with an overdrive manual transmission and 3.08 rear axle, it was putting along at 1500 rpm at 60. Wouldn't pull but half the truck weight as a trailer, rated at 2200 pounds trailer towing for a 4339 pound truck. Got 16 mpg.
I changed the rear axle gear ratio to 4.10, now I figure the trailer tow rating at 4700 pounds and I've had 6000 behind it. Gets 16 mpg unloaded at 60 mph. Gets 15 mpg at 52 with a 3000 pound camper on the hitch.
Now it has much better throttle response in all gears. It wouldn't have needed the axle gear change with the wide ratio transmissions of yesterday, but in a half ton in '98 the only manual transmission had only a 3.92:1 first gear. 6:1 would have been much better for towing.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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