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D-21 chassis versus engine s/n
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20528 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Topic: D-21 chassis versus engine s/n
    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.
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AC7060IL View Drop Down
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Joined: 19 Aug 2012
Location: central IL
Points: 3343 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AC7060IL Quote  Post ReplyReply Direct Link To This Post 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.

Test 855
Test 904
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