cam degreeing skunk2 pro 3

Discussion in 'Engine' started by madcivic, Feb 24, 2009.

  1. madcivic

    madcivic New Member

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    i built b20b crvtec engine.
    piston size 86mm
    cam skunk2 pro3.
    my question:
    1.how to do cam degreeing this skunk2 pro3?
    2.during degreeing cam the reading taken from vtec lobe only?
    3.must lock vtec rocker arm and how to lock it?
    4.give some cam in n ex degree after do the degreeing for reference only.
    TQ
     
  2. sek2dts@aol.com

    sek2dts@aol.com New Member

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    pro 3's are a serious cam. even if u follow skunk2's specs its still difficult to get them to idle corectly. i hope u have some kind of engine management cause u will be changing alot on the idle parameters. if u plan on going to the dyno right away which is a good idea with these cams theres no need to degree them in although knowing your piston to valve clearance is very important with these cams. i dont know much about these cams cause i have never had them and dont know anyone personally using them but the center line for those cams are way off from the factory centerlines. something like +4 on exhaust side and 0 or +1 on the intake.
     
  3. sek2dts@aol.com

    sek2dts@aol.com New Member

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    if u really need good advice and u bought your skunk cams form a authorized dealer call skunk2 up and talk to tony or dr charles which i dont think does customer service. i dont think you'll get better advice from anyone else. they have no problem helping people out as long as its purchased form an authorized dealer.
     
    Last edited: Feb 24, 2009
  4. madcivic

    madcivic New Member

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    i built this machine for drag race but i no idea to set this cam.
    should i set 0.0 degree and setting with do dyno run?
     
  5. sek2dts@aol.com

    sek2dts@aol.com New Member

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    noooo. like i said above the pro 3 centerlines( where skunk2 recommends the cams to be) are way off from 0-0. i would highly recommend not turning the motor over at 0-0 unless u checked your valve clearances. look at your spec sheet that u got with the cams.
    Intake:
    277°/13.0 @ 1mm / 0.000” lash
    Exhaust:
    284°/12.4 @ 1mm / 0.000” lash

    thats far from 0-0
    this is not a beginner cam to install. i highly recommend u call up skunk2 talk to him about your set up as most of us and probably u dont have dial indicators to properly degree cams. if u call them they can give u good advice on where to start. all i can give u is an about place to start and thats just from me looking at the spec sheet. your setup may need different adjustments. especially if u have oversized valves.
     
  6. RagingAngel

    RagingAngel 本田 Gearing Authority

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    [​IMG]

    Having something like this is essential for such a serious cam.
     
  7. sek2dts@aol.com

    sek2dts@aol.com New Member

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    and its one thing owning one of those /\ above. its another knowning how to use them. as racing angel stated, dial indicators are a must for a cam like this. can u install them without them? yes but if i were to install them without them i would not do it unless i got some real good advice from someone thats installed plenty of these and there not to many people that run these cams. im telling u the best advice you''ll get is from the maker of the cam.
    if u do everything correctly you''ll be making some serious power on your setup though(250whp+):bow:
     
  8. madcivic

    madcivic New Member

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    i have degree tools kit.
    1.degree wheel
    2.dial indicator
    3.pointer
    i'll cx v2p clearence.
    when do degreeing should vtec lobe to be lock?
    any idea how to lock it?
     
  9. RagingAngel

    RagingAngel 本田 Gearing Authority

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  10. sek2dts@aol.com

    sek2dts@aol.com New Member

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    first u should check valve to valve clearance before u degree the cams. your cylinder head should be off for this. when check clearance u have to lock your rocker arms up. this can be done three different ways.
    1- take the rocker pins and reverse them
    2- place a bb(bb from a bb gun) and place it behind the pins
    3- or what the service manual says and use a air compressor to lock it.(i have never used this method so i dont know much about it).
    if you are not clear on exactly what steps u need to do for the valve clearance i can elaborate if needed.
     
    Last edited: Feb 25, 2009
  11. madcivic

    madcivic New Member

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    sek2dts@aol.com...
    u mean don't lock vtec rocker arm during degreeing.
    can you explain more how to degreeing pro3
    TQ
     
  12. sek2dts@aol.com

    sek2dts@aol.com New Member

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    heres skunks2 instructions. after u have degreed the cams in your not gonna be finshed. degreeing cams put u really close to where u need to be and saves alot of time and money for dyno usage but it will put the cams in a spot where u can just move the cam gears back and forth a degree or two instead of guessing like having them at 0-0 and having to move them around + and - 5 degrees to find out where they start to make power which could be very dangerous moving them around like that. it would be like having factory cams installed at -5in -5ex and not knowing what direction to go and make power and u guess and start moving the ex cam forwards back towards 0 there gonna be a big possibility your gonna bend your valves. thats why doing this is very important on a large cam.
    skunk2 instructions.......
    One of the keys to making power is to properly set camshaft timing; in other words, when valves open and close in relationship to the position of the piston and crankshaft is critical to the performance of the engine. The process of properly setting the camshaft position is referred to as “Degreeing the Cam”. Many beginner tuners mistakenly believe that to degree cams means setting the cam gears at a certain position such as “+1 intake & -2 exhaust”. Though this information may be useful at times, these settings may not be accurate on all motors. For example when the deck of a head or block
    is machined, it will retard the cam timing. So the cam gear setting method may only apply to engines using the same type of cam gears with exact same head and block heights; and this also assumes that the given cam gear settings are the correct location for the cams. The most accurate way to set camshaft position is to properly “degree the cams”; this way you can be sure the cams are in the right position regardless of engine variations, deck heights, and cam gear marks. The method we are
    introducing is a simple method for setting cam positions using peak lift measurements. Cam degreeing can also be used to check valve opening and closing positions, durations at various lifts, and peak lift measurements.

    Step 1: Install a Degree Wheel onto the end of the
    crankshaft, and bolt a pointer onto the block. The pointer
    can be a sharpened piece of welding rod or coat hanger
    that can be bent to change the position of the pointer.
    Rotate the crankshaft to TDC, you can use a dial indicator
    inserted down the spark plug hole or the piston stop
    method; the piston stop method is more accurate. When
    the crankshaft is at TDC, move the pointer so it points to
    TDC / 0 degree on the degree wheel.
    Step 2: Set-Up dial indicator with the tip on the retainer,
    not the rocker arm. To get an accurate reading, It is
    important to make sure that the axis of the indicator is
    parallel with the axis of the valve. Make sure the rocker is
    on the base circle of the camshaft, in other words, make
    sure the valve is completely closed, and zero out the dial
    indicator. We recommend that you degree the cam with
    the lash set at 0.000.”
    Step 3: Rotate the crankshaft. When the cam starts to
    open the valve, the dial indicator will show the amount
    of valve lift. Rotate the crankshaft and stop when the
    pointer is pointing at the specified peak lift/center line
    position. Loosen the cam gear bolts and rotate the
    camshaft until the indicator is showing that the cam is at
    peak lift. Tighten the cam gear bolts. Rotate the engine
    two more rotations, stopping when the dial indicator
    reaches peak lift, look down at the degree wheel to
    make sure the position of the crankshaft is in the correct
    location. If not, repeat step 3.
    Step 4: Move the dial indicator to the other side of the
    head, and repeat steps 2 and 3. When peak lift positions
    of both the intake and exhaust cams are set in the proper
    locations, the cams are considered to be degreed in.
    Helpful Tip 1: When degreeing a camshaft, make sure
    that you rotate the crankshaft in the direction the
    engine normally runs. If you over shoot the position the
    crankshaft is supposed to be in, do not rotate the engine
    backwards, it will throw off your numbers because the
    tensioner only works properly in one direction.
    Helpful Tip 2: If you are having a hard time finding
    the centerline because the cam dwells at peak lift, you
    can take a reading of the degree wheel when the cam
    reaches max lift less 0.003” before and after peak lift.
    The middle of those two positions will be the centerline.
     
    Last edited: Feb 25, 2009
  13. sek2dts@aol.com

    sek2dts@aol.com New Member

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    sorry i messed up above rockers should be locked.
    heres the peak lift on both the cams
    Peak Lift: Intake
    100° ATDC
    Peak Lift: Exhaust
    104° BTDC
     

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