Le Roi Engines

History of Le Roi engines coming out in boxes

| June 2007

  • 06-07-032-100_0110.jpg
    A 1924 Le Roi Model 2-C, used for a hoist in a silver mine in California. Ed Malcolm also has the hoist. This engine weighs approximately 3,000 pounds with the hoist.
  • 06-07-032-000-0005.jpg
    A front view of the circa 1930 engine. Ed does not know what the engine was used for, but evidently it was under cover all its life. If anyone knows what this engine was used for, he would appreciate any help.
  • 06-07-032-100-0102.jpg
    An early 1940s D-140 ice blower weighing 2,420 pounds. It is approximately 6 feet long and will blow ice up to 40 feet. It was used for icing down food in the back of trucks and railroad cars before there were refrigerator units.
  • 06-07-032-000-0006.jpg
    The end view of the engine shows the original sign that tells who sold it, supposedly from Vermont. The engine had one owner.
  • 06-07-032-000-0001.jpg
    Made in 1924, the original “Mr. Le Roi” has been in Ed’s family since 1930. This engine was used on a paving machine.

  • 06-07-032-100_0110.jpg
  • 06-07-032-000-0005.jpg
  • 06-07-032-100-0102.jpg
  • 06-07-032-000-0006.jpg
  • 06-07-032-000-0001.jpg

Le Roi engines were first made in 1913, mainly for farm tractors. The earliest smaller engine I have seen is the Model 2-C dated 1919. The company made many different models with 1, 2 and 4 cylinders.

Around 1930, Le Roi started making engines with ball bearings on the main bearings and camshaft; these were all L-head engines. I have an original sales brochure from the early 1930s stating 87 percent of the internal parts of these engines interchange. In all of the engines I have disassembled, there is only one connecting rod, valve, and spring and piston size - 3-1/8-inch for all of the Model M and derivatives. The ball bearing engines are mostly 2-3/4-inch bore and they have the bearing made into the rod instead of an insert; they also have a smaller diameter valve.

Remember that these engines were primarily designed as power units. There were several models that used the same parts but changed the drive train, such as clutches, in-and-out boxes, transmissions, etc. There were many different flywheels, depending on the application. Some of the Model Ms had the power direct off of the crankshaft and some off of the camshaft for a gear reduction. They made the camshaft about 4 inches longer and added a ball bearing to help carry the load. If the engine was designed for a light-duty application, it had only one set of gears. For a heavy load, they doubled the camshaft gears.

Prior to 1940, the first overhead valve engine, the Model D-140, was developed. One of my books shows a spark plug change in 1940. They continued to make several different Model D engines and all of these engines are virtually identical to Allis-Chalmers engines. I have always been told that Westinghouse Air Brake Co., owned by Dresser Industries (who also owned Waukesha), bought Le Roi in 1954 and production was moved to Clinton, Iowa, to Climax Engine Co. The engines were called Le Roi Roiline. The Dresser engine website states Waukesha bought Climax in 1957.

Recently, I obtained a small booklet dated 1950 calling the engines "Le Roi Roiline" so obviously the buyout was earlier than 1957. Somewhere around 1958, all Le Roi production ceased and supposedly all company records were destroyed.

I called the Clinton historical society to see if they had anything on the engine factory or Le Roi engines. I was informed the Climax engine factory was closed down in the early 1980s and the historical society was presented with about eight large boxes of old company records. Evidently, no one had expressed an interest in them until now. The historical society is now going through trying to get an estimate of what is in the boxes. This may be a treasure and may answer questions about several brands of engines.

Dave Stockton
2/8/2019 10:05:55 PM

Greetings Ed, I just happened to come across your site while searching for some magneto information for an old LeRoi engine believed to be an M2. I have heard of your name before but have never had any contact information with which to reach you. Thank you for sharing your wisdom with us out here in Engineland - best regards.


Gas Engine Magazine A_M 16Gas Engine Magazine is your best source for tractor and stationary gas engine information.  Subscribe and connect with more than 23,000 other gas engine collectors and build your knowledge, share your passion and search for parts, in the publication written by and for gas engine enthusiasts! Gas Engine Magazine brings you: restoration stories, company histories, and technical advice. Plus our Flywheel Forum column helps answer your engine inquiries!

Be sure to take advantage of the Square Deal Subscription Program.

  • No Missed Issues.

  • No Renewal Notices.

  • No Additional Cost.

The Square Deal Subscription Program is designed as a paperless transaction with automatic renewals at a preferred low rate.   With advanced electronic notification, a 100% satisfaction guarantee and an easy opt-out plan, the Square Deal Subscription Program is the best value, risk free, eco-friendliest way to subscribe.

Facebook YouTube


click me