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Faunsdale, AL | Interesting that the Chamberlain used the horizontally opposed cylinders instead of a counterweighted crankshaft with the rod journals side by side. Of course JD could have done the same at any point.
There may have been some challenges to building that kind of crank that are not apparent from this side of the span of years since they were introduced. I know Caterpillar used an odd-fire vertical inline twin for a starting motor for several decades before building the same engine with an even fire crankshaft. That only lasted a few years before they went back to the original odd-fire design until they stopped offering pony motors as an option. This would have been on the D7 and D8 size tractors. They also experimented with sharing the crankcase oil between the pony and the diesel, but that didn’t last long either.
The last Caterpillar pony motors I’m aware of were smaller even-fire inline two cylinders that were available on some of the engines on wheel loaders etc before the option was dropped. They were very high revving and apparently earned the common name “buzz bombs”.
Edited by ccjersey 4/8/2025 19:26
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Old iron
