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Allis 426 vs Cat Challenger 403
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bigal121892 View Drop Down
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Joined: 05 Jan 2010
Location: Nebraska
Points: 812 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bigal121892 Quote  Post ReplyReply Direct Link To This Post Topic: Allis 426 vs Cat Challenger 403
    Posted: 01 Jan 2023 at 6:22pm
The Allis 200 topic, got me to thinking about a question I've wondered about for sometime. The 426 in the 7080 and the 7580 produced 210 Hp at 2550 RPM, but the Cat 403 in the Challenger 45, was able to produce 240 Hp at 2100 RPM. Did Allis spin them that fast just to get the torque down to save on the drive train?
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21899 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jan 2023 at 6:29pm
Transmission and lower end of the engine to keep torque at higher speeds. Input gears to the power director trans were different ratio (faster than 7030/50) to increase trans life as well.
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bigal121892 View Drop Down
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Points: 812 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bigal121892 Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jan 2023 at 7:17pm
Thanks for the info Doc.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21899 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jan 2023 at 8:25pm
The 7580 was 222 flywheel HP, 12 hp more than a 7080.
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victoryallis View Drop Down
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Joined: 15 Apr 2010
Location: Ludington mi
Points: 2878 		Post Options Post Options   Thanks (0) Thanks(0)   Quote victoryallis Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jan 2023 at 6:52am
Al an 8.3 in a 7580 makes a great combo until something goes wrong in the tranny.  Probably ok as long as your conservative with the smoke screw.  I can’t say that about whoever did my conversion.   
8030 and 8050MFWD, 7580, 3 6080's, 160, 7060, 175, heirloom D17, Deere 8760
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