Allis 426/3700 Engine max HP ?
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=52208
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Topic: Allis 426/3700 Engine max HP ?
Posted By: Orange Blood
Subject: Allis 426/3700 Engine max HP ?
Date Posted: 17 Jun 2012 at 8:00am
Hey for those of you who know, what is a realistic max HP that the stock 3700 Allis engine can withstand. I am thinking of putting one of those in a Class 5-6 truck, and would like around 250HP. I would be running the engine from a 7060, or 7080 probably, so it will have all the cooler parts, and the heavy duty radiator. Also what cam would you run, the newer cams/turbos die off at 1500 RPM, the older ones lug better.
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Still in use:
HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060
Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7
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Replies:
Posted By: cotncrzy
Date Posted: 17 Jun 2012 at 10:07am
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Without lots of expensive block work, 180 to 200 HP is about all. I have saw some that ran 220 but always having problems with main and rod bearings. 7080 will have a balanced crank, and be capable of turning more RPM's. I have 7080's that were turning 200 or so HP, @2800 RPM's we turned them back to 170HP @ 2500 RPM'S and not had any trouble in 3000 hours, and have saved lots of fuel.
I guess after saying that, I know of a 3700/426 that is running 2500 HP. It runs 15 seconds at a time, and burns 3 gallons of fuel.
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C, WD45,WD puller, 185, 200, 7060 Red Belly, 7060 Black Belly,8010, and a R52 Gleaner, AND PROUD OF THEM!
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Posted By: Kevin210
Date Posted: 19 Nov 2018 at 8:05pm
Back when I pulled my 210 all time I never did any block work to
it at all,none.Now I did have the pump worked on by Scheid in terra haute,also changed the fuel lines that they recommended.Changed the turbo too.I can say with witnesses that even with a new pto in it we never could tell how much hp it was making but I know it was more than 200 by a long shot and I can say that from watching videos that I feel like there are some other 210's and 220's that are making more than mine did.Now I did have the timing advanced to much and over time it did burn a hole in a piston.
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Posted By: HagerAC
Date Posted: 19 Nov 2018 at 9:16pm
My 8070 had 215 when we put it on the dyno. Turned out back to 185 since I don't really need that much power for anything I do with it. Know of an 8050 also running at 215. Also a 7060 that was running at 225 back when it was their main tractor. If you don't use all that power all the time they will probably last. Keep good bearings in the bottom end. I would think an ambac pump will be able to deliver more fuel than a roosa master, but I can't say for. Ed will know more in that department
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30+ A-Cs ranging from a 1928 20-35, to a 1984 8070FWA, Gleaner R52
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Posted By: Brad in WA
Date Posted: 20 Nov 2018 at 5:09am
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How about using a 516 from an N7, 275 honest HP.
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Posted By: d17brown
Date Posted: 20 Nov 2018 at 6:56pm
will a N7 engine bolt up to D21
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phil
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Posted By: injpumpEd
Date Posted: 21 Nov 2018 at 7:41am
not without custom made adapter. John Rose in Ohio has the Slutty Allis, and they have 516's in all 3 of their classic superstock pullers. He usually brings them to Gordyville, and is a very nice guy to talk to. Find him on FB too.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Posted By: Calvin Schmidt
Date Posted: 21 Nov 2018 at 7:55pm
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I have a 3500 MK II "On Highway Spec" (truck) engine in my 220. It came with the Simms injection pump and the same injector tips as the 7080. I added an intercooler and large water pump. Based on 190 PTO hp with stock pump settings, I estimate stock it was 225 hp at the flywheel. Truck engines normally will have higher ratings because the HP load is not as continuous as a tractor in the field or in a marine application. Keep the RPM's under 2400 and you will likely be safe at 250 Hp. Cursing RPM should be 2000-2200 in my opinion
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Nothing is impossible if it is properly financed
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Posted By: DrAllis
Date Posted: 21 Nov 2018 at 10:37pm
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I ran an F-650 with a Caterpillar C-7 @ 230 HP/660 ft lbs @ 1400 RPM for 250,000 miles. It is 440 cubes and would get 10 MPG most of the time weighing 24,000 lbs. It would cruise all day long at 55 to 60 MPH (14-1500 RPM) because it had great torque down that low. You'll need to keep that 426 up to 2,000+ to get anywhere as the torque is probably less than 500 ft lbs @ 1700 RPM, depending on how heavy your vehicle actually is.
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