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Updated: May 4, 2025
There was a rumour that I did and, although I had never before been in contact with one, I undertook and carried through the job. That gave me a chance to study the new engine at first hand and in 1887 I built one on the Otto four-cycle model just to see if I understood the principles. "Four cycle" means that the piston traverses the cylinder four times to get one power impulse.
"Listen, Ned, listen! There is a motor-boat in the river. Don't you hear it?" "I don't hear it, Dick." "But you must hear it. It's growing plainer every minute. It's a four-cycle engine, and a fast boat, too. I can tell you that. Who can it be? Do you suppose it is your father looking for you?" "I hear it now. No, it isn't Dad. My time isn't up for several days yet.
The gas engine of the present day, although from a structural point of view is very different to the early engine, or even that of fifteen years ago, is, in respect to the principle upon which it works, very similar. The greater number of smaller power engines in use in this country work on what is known as the Otto or four-cycle principle; and it is with this class of engine we propose to deal.
The American artist heard with a vague smile the difference between the ordinary four-cycle engine of an automobile, and the two-cycle engine of this marine motor, with its piston receiving an impulse at each down stroke; tried to understand how the charge of vaporized petrol was drawn into the crank-chamber, and there slightly compressed; how the gas afterwards traveled along a by-pass into the firing chamber at the upper part of the cylinder, to be further compressed by the up-stroke of the piston and fired by the sparking plug, while the burnt gases escaped through a port uncovered by the piston in its downward strokes, admission and exhaust being thus controlled by the piston movement alone.
When Joe became insufferably informative Perry blandly asked him questions about the engine, such as, "What's the difference, Joe, between a two-cycle and a four-cycle motor?" or "What happens when the water-jacket becomes unbuttoned?" and was delighted to find that Joe lapsed into silence until he had had time to surreptitiously consult his book.
The old Gainsway shook like this for eight days before they spotted the tubes that were causing a four-cycle beat." "Why can't we spot it right off?" Quill asked. Mike got it then. Fitzhugh was listening in. Quill wanted Mike the Angel to substantiate his own statements to the roboticist.
It was in 1890 that I began on a double-cylinder engine. It was quite impractical to consider the single cylinder for transportation purposes the fly-wheel had to be entirely too heavy. Between making the first four-cycle engine of the Otto type and the start on a double cylinder I had made a great many experimental engines out of tubing. I fairly knew my way about.
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