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Thread: Cummins 6CTA8.3 Injection Timing

  1. #21
    4 Star General 74M35A2's Avatar
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    Quote Originally Posted by HETvet View Post
    I've got a little bit more than free access. Glad you were able to get the information you were looking for though
    Were you able to find anything more definitive or different? Not having an easy way to pressurize fuel to 300-375psi, I'd much rather try to use the dial indicator method, if possible. Can you find any reference to that, in relation to the ESN I provided, or even something generic for the 8.3 with an MW pump?
    CFO @ Portacharger

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    4 Star General Wildchild467's Avatar
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    Quote Originally Posted by 74M35A2 View Post
    Advancing timing is supposed to reduce EGT, as well as dumping the muffler.
    You going to get rid of your muffler??
    Tom

    I'm just a 24 volt guy living in a 12 volt world.
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    4 Star General 74M35A2's Avatar
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    Quote Originally Posted by Wildchild467 View Post
    You going to get rid of your muffler??
    What are you doing in the 5T forum? You've got one of those little boy trucks. Get outta here...
    CFO @ Portacharger

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    Quote Originally Posted by 74m35a2 View Post
    what are you doing in the 5t forum? You've got one of those little boy trucks. Get outta here...
    lol
    1991 BMY M931A2- "Harvester of Sorrow" Sold 5/28/16

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    4 Star General Wildchild467's Avatar
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    Quote Originally Posted by 74M35A2 View Post
    What are you doing in the 5T forum? You've got one of those little boy trucks. Get outta here...
    Bully!
    Tom

    I'm just a 24 volt guy living in a 12 volt world.
    I never had so much fun going so slow.
    Its not what you buy, its what you build.
    Growing old is mandatory, growing up is optional.


    1972 M35A2 W/W
    1968 M109A3 W/O W
    M105A2
    M200A1
    1984 Libby MEP-002A
    PE-75 (2.5Kw 110VAC 60 cycles powered by a Briggs Model ZZ)
    1940 Ford Pickup Street Rod
    1923 Ford T-Bucket
    2000 Jeep Cherokee with 6.5' Western Unimount
    2003 Yamaha V-Star 1100 Custom (deer slayer)

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    Quote Originally Posted by 74M35A2 View Post
    I also have free access to Cummins QuickServe (everybody does), and I can't seem to find any useful injection timing info. They talk about IP spill port timing, and they show the dial indicator to measure plunger #1 height ion their tool section of that chapter, but there is no table or chart or how-to for this method. I was expecting to find a timing table of plunger height vs crank degrees. I have not read it in depth though, and have yet to do that. This is easy to find on the internet for a 5.9L with the 7100 pump. My ESN (Engine Serial Number) is: 44455234 (saved within and working with Cummins Quickserve), please try to find timing info beyond what I did if you can.

    I bought a full size Volvo road tractor intercooler, same as member 4xdesign did. He did a fabulous job of measuring to find the best fit one, and then installation also. I am copying that. But, I want to install my EGT before I do any mods, so I can accurately report their effect. Advancing timing is supposed to reduce EGT, as well as dumping the muffler.
    Have you gotten any EGT numbers? I'm very curious to see how hot these engines get from the factory.

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    No, not yet. That is why I am waiting on mods, so I can actually quantify each with an EGT and timed acceleration runs. Hope to have base EGT data by end of this week, but not tonight, as a local member invited like everybody over for free BBQ ribs and beer. So, only fishing stories tonight...
    CFO @ Portacharger

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    Yeah I just took my truck on its first long trip 400 miles Towing a 33' 5th wheel some very steep grades High altitude and flats..
    I have the Truck turned up and have a boost and egt guages a 1100 cfm air filter (550 stock) and a muffler delete kit

    Total miles 400
    used about 1 tank of fuel 55 gallon approx I purchased 72 gallons of fuel but cam home with way more than I left with
    33' Fifth wheel right about 8-9k lbs
    Saw boost as high as 30 psi
    Top speed reached for short period of time 70 mph
    and I did my best to keep my egts 1300 and below but this truck had my gauge easy maxed out (1500 deg) so had to down shift
    I put 20oz of Radiator fluid in each tire before the trip seemed to help out a lot on the 55 mph shakes (from when i picked it up)
    Engine temp never got over 200 deg
    Transmission was 185-225 deg
    Hit elevation as high as 7000 feet noticed a huge power loss if my math is correct a 21% LOSS

    all and all truck did great and was a huge hit at the dunes and in the Parade (sand mountain NV)

    Would love to see the changes in getting the timing advanced.........

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    General 4XDesign's Avatar
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    Quote Originally Posted by fattboy123456 View Post
    Yeah I just took my truck on its first long trip 400 miles Towing a 33' 5th wheel some very steep grades High altitude and flats..
    I have the Truck turned up and have a boost and egt guages a 1100 cfm air filter (550 stock) and a muffler delete kit

    Total miles 400
    used about 1 tank of fuel 55 gallon approx I purchased 72 gallons of fuel but cam home with way more than I left with
    33' Fifth wheel right about 8-9k lbs
    Saw boost as high as 30 psi
    Top speed reached for short period of time 70 mph
    and I did my best to keep my egts 1300 and below but this truck had my gauge easy maxed out (1500 deg) so had to down shift
    I put 20oz of Radiator fluid in each tire before the trip seemed to help out a lot on the 55 mph shakes (from when i picked it up)
    Engine temp never got over 200 deg
    Transmission was 185-225 deg
    Hit elevation as high as 7000 feet noticed a huge power loss if my math is correct a 21% LOSS

    all and all truck did great and was a huge hit at the dunes and in the Parade (sand mountain NV)

    Would love to see the changes in getting the timing advanced.........

    What kind of filter are you running? I am still pulling filter indicator in the red every time. I'm waiting with anticipation on timing as well!

  14. #30
    Sergeant fattboy123456's Avatar
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    Quote Originally Posted by 4XDesign View Post
    What kind of filter are you running? I am still pulling filter indicator in the red every time. I'm waiting with anticipation on timing as well!

    b125003-016-140.jpg20150926_155105.jpg This is not a factory replacement I modified my intake





    20150926_171552.jpg20150926_171158.jpg

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