HD5 bigger injectors
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=116822
Printed Date: 29 Jul 2025 at 12:14am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: HD5 bigger injectors
Posted By: serioussam
Subject: HD5 bigger injectors
Date Posted: 29 Dec 2015 at 7:50pm
Looking at putting bigger injectors in the 2-71
And would like to know my options thanks
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Replies:
Posted By: SteveM C/IL
Date Posted: 29 Dec 2015 at 11:18pm
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I put 70's in my 6-71 and drove it on the floor.Never had an issue from injectors.
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Posted By: Eric B
Date Posted: 04 Jan 2016 at 5:30pm
I ran 70's in my truck inline 6-71...that gave in the vicinity of 250 HP. You should be able to count on about 40 (+) HP per cylinder. 65's would work well too...about 35 HP per cylinder. Your HD 5 likely came with 55's new.
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Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
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Posted By: Matt (Jordan,MN)
Date Posted: 04 Jan 2016 at 6:13pm
These engines ran the older HV ( high valve) injectors. They originally came with HV6 but you can put in a HV7's. From what i was told the 6's had better power at high speeds and the 7's were better at low end torque. Are HD5's have HV7's in them and have no complaints.
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Owner of Matt Scott LLC
Specializing in NOS and used Allis Chalmers tractor & implement parts & liturature and Magneto Repair
http://www.mattscottllc.com/
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Posted By: Coke-in-MN
Date Posted: 04 Jan 2016 at 7:00pm
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I have HV 7 in mine - 2nd set since i owned it - last set I had rebuilt and bought through truck company I plowed snow at - cost me $27 each exchange... probably more now ...
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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