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D-21 chassis versus engine s/n

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment -Knowledge Base
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Printed Date: 17 Jul 2024 at 7:30am
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Topic: D-21 chassis versus engine s/n
Posted By: DrAllis
Subject: D-21 chassis versus engine s/n
Date Posted: 22 May 2023 at 6:08pm
Nebraska Test tractors: Series 1 D-21 chassis s/n 1012 (October 1963) and engine 3D-1046 with no turbo..........   Series 2  D-21 chassis s/n 2109 (June 1965) engine 3D- 2265 with turbo and eng oil cooler.

Posted By: AC7060IL
Date Posted: 30 Jun 2023 at 10:05am
Great comparison of the two different 426s in similar D21 tractors (AC 3400 non-turbo versus AC 3500 turbo/oil cooled). Turbo/oil cooler added 24.47 hp while only 0.595 gal/hr fuel increase.
1963 AC 3400 produced 105.0 hp @ 2200rpm with 7.137 gal/hr fuel usage.
1965 AC 3500 produced 129.47 hp @ 2200rpm with 7.732 gal/hr fuel usage.

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