1:2 Scale John Deere Model A Engine

[LegoLord1880]

Here is a scale model engine I made, inspired by Digitaldan's 1:1 scale engine. Before I get into the LEGO version I made, let me tell a few things about the original:

The John Deere Model A was a row crop tractor built from 1934 to 1952 in three generations: Unstyled, Styled, and Late Styled. It was a direct competitor to the Farmall F-20 and later the Farmall H. The engine was a transverse mounted inline 2 with a 5.5" bore x 6.5" stroke, for a total displacement of 309 ci (5.1 Liters!). Governed speed was 975 RPM. These engines were notorious for being extremely loud, and vibrated a lot with terrible power delivery. In my opinion, the only reason John Deere stayed in business was because their tractors were cheap to run. In 1934 a model A on steel wheels sold for $1,025. The comparable Farmall F-20 on steel sold for $900-$1,000 in 1934. The difference was that because of the high compression ratio, the Deere could run on may different fuels. The F-20 started on gas and switched to kerosene when warm. 

My model has 8x8 square pistons and a 10 stud stroke for a total displacement of 655 cc. The crankshaft is built out of 6x6 round bricks and incorporates engine1ear's caged bearing system. I built the model in Studio 2.0, and it consists of 12 separate modules: The block, crankshaft, cylinder casting, camshaft, head assembly (including valves), flywheel, 2 pistons, and 4 pushrods. All these modules add up to a grand total of: 2366 parts! 

https://www.tractordata.com/farm-tractors/000/0/2/25-john-deere-a.html

Why only two cylinders? 

 

Edited Tuesday at 01:48 AM by LegoLord1880