"226" engine differences
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment -Knowledge Base
Forum Description: Long term storage of technical article, etc
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=204232
Printed Date: 22 Nov 2024 at 2:55pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: "226" engine differences
Posted By: DrAllis
Subject: "226" engine differences
Date Posted: 19 Nov 2024 at 5:32pm
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The famous West Allis built A-C "226" gasoline and LP gas engines have quite a history starting in 1953 with the introduction of the W-226 series used in the WD-45 tractor and also in many other applications. The W-226 was the next generation engine evolving from the W-201 engine first used in the WC/WF and WD tractors and other applications. The W-201 was a square engine with a 4 inch bore and 4 inch stroke for 201 cubic inches. The new W-226 retained the 4 inch bore and was given a 4 1/2" stroke. Compression was also raised to 6.5 to 1. The W-226 was the first A-C engine to be equipped with "Power Crater" pistons, which instead of a typical flat top piston design, the Power Crater was designed like a cereal bowl, which positioned the air/fuel mixture more to the center of the combustion chamber where the spark plug was. The W-226 gas engine was 43 PTO HP at 1400 rated RPM in the WD-45. In late 1957, the new "G-226" gas/LP gas engine was first released in the D-17 tractor. The new G-226 had the same bore and stroke as the W-226, but the block was different and stronger, main bearings were 3 inches in diameter (instead of 2 1/2 inches), compression was raised to 7.25 to 1 (gas) and rated speed was increased to 1650 RPM's. These changes gave the D-17 53 PTO HP with the tractor being equipped with power steering, which probably took 1 or 2 HP to operate. While they share many parts, they ARE NOT and never were the "same" engine as some people think. The G-226 continued on in the 170 and 175 tractors until 1974, with flywheel HP reaching the 70+ HP mark from the original 63 flywheel HP of the D-17 engine. Once again, a W-226 and G-226 are different engines.
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