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Thread: Simp's M923 Big Cam Repower

  1. #1
    I'm the dude, man! Steel Soldiers Vendor simp5782's Avatar
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    Default Simp's M923 Big Cam Repower

    Aight folks, well hopefully I won't have 500,003,043 posts before the actual finish product is complete but I thought I would go ahead and show my next project since this will be a pull out and overhaul more than likely. ODO in the 915A1 says 133,000. Was a Kansas National Guard truck. At that mileage the big cam could be just getting broke in. Tried a test run. Injection pump is puking from the bottom of it. Going to see what is leaking hopefully tomorrow. Engine sounds like it has good compression.

    Big Cam III rated at 400hp/1350ft/lbs. At the current moment it has an Untagged Schwitzer turbo on it. I am going to assume it is a 4LHR. I am going to plan on some upper range injectors. some pump work. HT4B Holset turbo and dual fuel line mod. Should see some pretty respectable numbers out of it.

    I plan on using the front mount cross member from the 915 in my truck. Being that it is 33 inches across on it with the support plates behind it at 33 3/4" across should fit just fine so that will save up a lot of the front mount fab time that some folks have said is a problem. The rear mounts are already set up from the CAT transmission install. Everything else should be pretty easy going compared to my last project.

    This truck sat in south texas for a few years so it was covered in barbs. Bad enough that my crowbar cant break thru them.

    Attached Images Attached Images
    Last edited by simp5782; 04-05-2018 at 19:27.
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1 (Big Cam III, HT3B Turbo, Brushless 24v Alternator with equalizer, A/C, Rear 20,000lb winch. 11R24 rear tires and 395s up front.)
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

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  3. #2
    4 Star General 74M35A2's Avatar
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    The race is on.

    Your swap will be a good one for the board to learn. Big Cam turbo engines are awesome, plentiful, and low cost. You are replacing an engine the same displacement and block style, so hope it goes well.
    CFO @ Portacharger

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    4 Star General sandcobra164's Avatar
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    I can't wait to see. You gave Clint about a year of lead time. Hope you both have upgraded transfer cases before the race or tug-of-war takes place. It was nice to find out that the M915 front mount will be an easy swap. I don't think I'll ever need Big Cam power but if my one of my boy's avoids braces, I may talk myself into it.
    84 AM General M923 "General Non-Sense"
    85 Chevrolet M1028 CUCV "Sarge"
    05 Silver Eagle M1102 (Sarge's New 4 Wheeler Hauler)

    Gone but not forgotten....
    71 AM General M35A2 "Big Trucks"
    87 Pribbs Manufacturing M105A2

  5. #4
    I'm the dude, man! Steel Soldiers Vendor simp5782's Avatar
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    Quote Originally Posted by sandcobra164 View Post
    I can't wait to see. You gave Clint about a year of lead time. Hope you both have upgraded transfer cases before the race or tug-of-war takes place. It was nice to find out that the M915 front mount will be an easy swap. I don't think I'll ever need Big Cam power but if my one of my boy's avoids braces, I may talk myself into it.
    I am headed to Profo's sometime in the next week or two is the plan to do all my trailer hydraulics and HEMTT case swap. Just got some movements going on at the current that is delaying that.
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1 (Big Cam III, HT3B Turbo, Brushless 24v Alternator with equalizer, A/C, Rear 20,000lb winch. 11R24 rear tires and 395s up front.)
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

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    Former SSG 98G's Avatar
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    I watch with interest. ..

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    General Russ Knight's Avatar
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    Following.
    M925A2 ROPS, MEP-803A, M105A

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    Colonel av8or's Avatar
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    Can't wait to see the progress. Have been collecting the parts to do mine. Too many projects to little time.

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  10. #8
    4 Star General 74M35A2's Avatar
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    10-4 on braces, both my kids have them, there goes $10,000.

    So the Simp855 didn’t fire in the test video. Mine did. If he goes from non-running to installed and running well, before me, I’ll have to hand it to him. My trans will still shift faster though !!! Bring it bubs....
    CFO @ Portacharger

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  12. #9
    4 Star General Ford Mechanic's Avatar
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    That cross member looks very familiar, I bought one off a fellow member who claimed it was a cab mount for a 923. Now I know what it was for! Too bad I gave it away last year at the Denton rally I belive, do I would have given it to you.

    Sent from my SM-G900V using Tapatalk
    1991 M923A2 BMY 8.3
    1967 M35A2 LDT 465-1C sold to BONEDOC
    OVERKILL IS UNDER-RATED

  13. #10
    I'm the dude, man! Steel Soldiers Vendor simp5782's Avatar
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    Quote Originally Posted by Ford Mechanic View Post
    That cross member looks very familiar, I bought one off a fellow member who claimed it was a cab mount for a 923. Now I know what it was for! Too bad I gave it away last year at the Denton rally I belive, do I would have given it to you.

    Sent from my SM-G900V using Tapatalk
    That is why i wanted the whole truck. I paid under 2500 for the whole truck and that included the cost to get it here from south texas. I wanted a few of the other parts on it.
    2008 F-250 6.4L Powerstroke
    1979 AM General M920
    1984 AM General M915A1 (Big Cam III, HT3B Turbo, Brushless 24v Alternator with equalizer, A/C, Rear 20,000lb winch. 11R24 rear tires and 395s up front.)
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

  14. The Following User Says Thank You to simp5782 For This Useful Post:

    silverstate55 (04-14-2018)

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