Degreeing camshaft bae hemi/gear drive

Discussion in 'PSI Superchargers Tech Questions' started by sean70ss, Mar 10, 2016.

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  1. sean70ss

    sean70ss Member

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    Can somebody walk me through this I have never done it with a gear drive. where to start and end up? I have located true tdc which was easy. Want to put my cam in at 114. Thanks!!!! Sean
     
    #1
    sean70ss, Mar 10, 2016
  2. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    Most hemi racers use the intake opening at .050 lift as their reference number.

    Once you have true TDC set, you will either need a cam degree tool (like Robert Reehl sells) or a lifter, a cut off push rod and a magnet base for a dial. I still recommend using a lifter you run so you have the same wheel diameter. There are some kits on the market that have a dial on a lifter you can put in the lifter bore, but they do not have the same wheel diameter, so it will throw your readings off a few degrees.

    Once you get your dial/lifter set up, make sure you have the dial zeroed off the back side of the cam and make sure you put some tension on it to ensure the lifter is on the cam. slowly rotate the engine over until you reach exactly .050 lift. look down at your pointer and see where it is reading. Most hemi cams are installed between 32 and 38 degrees before top dead center, at .050 lift.

    What I use to save time, before I bolt the cam gear on, I use the fuel pump drive to rotate the cam to .050 lift (as described above). I then rotate the engine to the desired install point (lets say 35 BTDC). I then try to find the closest 'clocking' of the cam gear to get the bolts to line up. Depending on your cam gear, you may have to go plus or minus half a degree to get it all to line up.

    Once you have the cam gear installed, recheck it to make sure you are installed where you want it. I usually back it off and check it 3 more times to verify.

    Once you have it where you want it, if you are using loctite on the cam gear bolts, I recommend installing two of them (marked) with no loctite first, then installing the rest of the bolts with loctite to a torque spec of 35 lbs. After the rest are installed, remove the two marked bolts and put loctite on them and install/torque. The reasoning behind this is to keep loctite from seeping between the gear and drive hub, possibly cocking it off center.
     
    #2
    Will Hanna, Mar 10, 2016
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  3. sean70ss

    sean70ss Member

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    Will,

    I have the that tool from Reehl. Ok so go ff of .050 then. A little nervous being I have not done this on a hemi but need to learn.

    Will, is there a certain position to put the cam in first or just stick it in there? Thanks a million Will!!!!!
     
    #3
    sean70ss, Mar 10, 2016
  4. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    i would consult your cam mfg or tuning consultant for best results.
     
    #4
    Will Hanna, Mar 10, 2016
  5. pete9857

    pete9857 Member

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    I'll add one tidbit, when checking, make sure can doesnt spin its way out of the block!
     
    #5
    pete9857, Mar 10, 2016
    Joad Donnelly and Will Hanna like this.
  6. NITROBANDIT1

    NITROBANDIT1 LOST IN SPACE

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    this will give you a idea of where to start depending on what cam gear you have and how much each setting is worth http://rcdengineering.com/webfm_send/5

    one thing I do know, is no cam is ever what they say it is. if you put it in straight up, it might be 5-8 degrees off. the only way is to measure it and set it with the wheel. you can verify all the valve events during this. comp cams made a 2 foot diameter wheel that was good for accuracy. always turn in the engine rotation, and don't go backwards, it messes with the readings. heres a video
     
    #6
    Last edited: Mar 10, 2016
    NITROBANDIT1, Mar 10, 2016
  7. Cdn526

    Cdn526 Member

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    if you still want a bit of help, call me (CST), and have your phone on speaker, i'll walk/talk you thru it.
    it's really simple, as Will has explained. I have the Reehl set-up, and have degreed our motors countless times.
    204 381 7869
    Clif
     
    #7
    Cdn526, Mar 10, 2016
  8. sean70ss

    sean70ss Member

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    Thanks for all your help guys. I am going to play with this and see how I come out. Now the weird thing is when I try to find TDC I cant get my pointer to line up no where near close I have the 7" rcd degree wheel. I do the normal find tdc/roll back to tdc/ then divide the 2 but its not close to use the pointer.
     
    #8
    sean70ss, Mar 11, 2016
  9. kosky racing

    kosky racing Comp Eliminator

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    Is this a keyway crank or spline drive?
     
    #9
    kosky racing, Mar 11, 2016
  10. sean70ss

    sean70ss Member

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    I am not sure I have never had it off if it is splines or keyway
     
    #10
    sean70ss, Mar 11, 2016
  11. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    when you use a positive stop on the piston, you will obviously have to keep moving the pointer until you get "x" degrees on both sides of zero. If you have a wheel with zero already marked and it's nowhere close, you may have to pull the degree ring off the hub and re-clock it.

    Also on a RCD degree wheel, the magnets are 20 degrees behind the 90 marks. I usually take a punch and mark the magnets so when you go to set trigger timing, you can find the magnets easy (big pulleys cover up the magnets on the side so you can't see them).

    Pro Tip - if you have the older style RCD drop in pointer, epoxy it in, that way you have no movement in it.
     
    #11
    Will Hanna, Mar 11, 2016
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  12. kosky racing

    kosky racing Comp Eliminator

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    Is there allready A O on the degree wheel?
     
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    kosky racing, Mar 11, 2016
  13. kosky racing

    kosky racing Comp Eliminator

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    Will the RCD -PSI degree wheel has differant placements of the magnets
     
    #13
    kosky racing, Mar 11, 2016
  14. h2b puller

    h2b puller Member

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    RCD has degreed wheels for nitro & alcohol, the magnets are in different locations due the timing difference they run.
     
    #14
    h2b puller, Mar 11, 2016
  15. sean70ss

    sean70ss Member

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    There is no 0 on there. now I bought it so long ago maybe I have the wrong one it is the 7" From where I mark it and roll back there is 50 degrees different so my split is 25 and I cant even get close to my pointer and I have moved the degree wheel numerous times.
     
    #15
    sean70ss, Mar 11, 2016
  16. Joad Donnelly

    Joad Donnelly Member

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    If there is no TDC/0 mark on your wheel what are you trying to line your pointer up with?
     
    #16
    Joad Donnelly, Mar 11, 2016
  17. sean70ss

    sean70ss Member

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    #17
    sean70ss, Mar 11, 2016
  18. pete9857

    pete9857 Member

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    stupid ? , are you on no. 1 cylinder and not 2?
     
    #18
    pete9857, Mar 11, 2016
  19. pete9857

    pete9857 Member

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    a stupid question, not being an a--hole! Just trying to help
     
    #19
    pete9857, Mar 11, 2016
  20. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    sean, I just sent you a text. shoot me a video of what you are running into and I will try to figure out what the problem is.
     
    #20
    Will Hanna, Mar 11, 2016
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