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  1. #1

    Adjustable push rods

    Question....Say you have the Screaming Eagle Adjustable Push rods, Different brand lifters and cam.
    Adjust to the push rod Manufacture specs or ?

  2. #2
    Member Streetglide16's Avatar
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    are the lifters Hyd or solid? If they are Hyd, adjust as the push rods claim, as the thread pitch will determine the length. If they are Solid or anti pump up then you will need to adjust to lifter specs
    16 Street Glide Special, 117" 11.3:1, T Mann Pro Touring Port Job, 680 Cams, Hydo/Solid Lifters, S&S Adjustable Push Rods, Oil Pump Air Cleaner and Cam Plate, P61mm HPI, TTS Programmer, Grudge Box, Billet Clutch Basket, Baker Comp, Rinehart Classic Duals, Chrome Frontend, Painted Inner Fairing, LED Lights

  3. #3
    Kinda what I thought, next question is what if the base circle is less...?

  4. #4
    Member Streetglide16's Avatar
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    start at zero lash and adjust as needed
    16 Street Glide Special, 117" 11.3:1, T Mann Pro Touring Port Job, 680 Cams, Hydo/Solid Lifters, S&S Adjustable Push Rods, Oil Pump Air Cleaner and Cam Plate, P61mm HPI, TTS Programmer, Grudge Box, Billet Clutch Basket, Baker Comp, Rinehart Classic Duals, Chrome Frontend, Painted Inner Fairing, LED Lights

  5. #5
    Senior Member CoHam's Avatar
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    It won’t matter what cam you have. I’m going to assume that if you had solid lifters you’d have a race bike and wouldn’t be asking this question. Hydraulic lifters need to be set to their mid point when sitting on the base circle of the cam by adjusting the pushrods a specific distance.
    So, the two things that matter are how much distance can the lifter travel and how much does the pushrod grow in length with each complete turn (or a finer measurement is each “flat” on the nut)
    You need to have the given cam lobe on the base circle, as Streetglide16 said, and then lengthen the pushrod just far enough to take all lash/play out of the valve train. Now you’re at the start position and need to lengthen it further to get in the middle of the lifter.
    So, knowing the lifter travel needed and the thread pitch of the pushrod are the important data. The cam doesn’t matter because you’re adjusting while on its base circle no matter which cam.
    Last edited by CoHam; 02-06-2018 at 10:28 PM.

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