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The Difference in a Z6 and D15b Cam

Discussion in 'Engine Building' started by Dark91zc, Jan 6, 2006.

  1. Dark91zc

    Dark91zc Senior Member

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    [​IMG]
    the top cam is a D15b the vtec lobe is fatter than the z6 vtec lobe.


    [​IMG]
    both cams side by side

    i do think the lobes on a d15b are a thousandth of a inch bigger. i dont have the worlds steadiest hand.

    if anyone has any info one this let me know :) thanks
     
  2. K2e2vin

    K2e2vin Senior Member

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    There has been lots of controversy over this on sohchonda.com; turns out some of the d16z6 camshafts are the same as the D15B-VTEC ones, and then some are different. Nobody knows what Honda did...
     
  3. hcivic.com

    hcivic.com Senior Member

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    measure the duation and lift then compaire you can tell nothing with the naked eye
     
  4. Dark91zc

    Dark91zc Senior Member

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    d15b is slightly larger by +/- 0.001" if i measured right
     
  5. olddude

    olddude Junior Member

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    A slight difference in lobe size on a stock cam shouldn't mean it is diferent. two different size lobes could give the same specs , depending on the difference between the high and low points of the lobe in relation to the rocker.

    Usually with a reground cam , you don't want larger , you want smaller. The cam is measured from the centre out . When a cam is modified to give it more lift , it is undercut .
    The non contact side is ground so that when you adjust your valve clearance , it takes up the slack from the grind. As the cam turns , the valve is pushed further by the amount that was ground off .(depends on rocker ratio)
    So with a modified cam , the lobe is smaller .

    Duration is a different thing.
     
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