Camshaft_Drives

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       Camshaft_Drives
    Part No Applications: C-AJJ3323, C-AJJ3325, C-AJJ3327, C-AJJ3328
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    Fitment of an uprated cam drive system is essential when building a performance orientated engine. Timing scatter induced by the standard set up can reach up to 15° once the single row chain has stretched, which it does after only a few miles. This scatter not only affects the cam timing, but also the ignition, the distributor being driven by the camshaft. Power loss suffered by this phenomenon is substantial. Replacing the standard single row (simplex)
    system with a dual row (duplex) system greatly reduces the problem, use of a tooth belt system all but eliminates it. The belt system vastly reduces valve train noise and also helps damp out some of the odd harmonics generated by the 3 main bearing ‘A’ series engine. It is also extremely important to time any cam in to its required setting to obtain maximum performance, especially performance cams. The ‘dot to dot’ method can, because of manufacturing tolerances, be out by as much as 15° or more. Anything over 2° out, and power suffers more noticeably in small bore engines. In race engines you probably lose 1 hp for every degree the cam timing is out, more if over 6°. However, all manufacturer figures are really a close guide line. Dyno tuning the engine is the only way to optimise cam timing.

    1 a Budget standard cast duplex gear and chain set, road use only.
           Order as part number C-AJJ3323.
        b Budget lightened cast duplex gear and chain set. Not recommended for rally/race
           application.
           Order as part number C-AJJ3324.

    2 Ultralight non-adjustable steel duplex gear and
        chain set.
        Order as part number C-AJJ3325.

    3 Vernier adjustable steel duplex gear and chain set. Uses the dowel adjustment system as the belt kit.
          Order as part number C-AJJ3327
        a Steel duplex cam gear, adjustable.
              Order as part number C-AEG578.
        b Steel duplex crank gear.
              Order as part number AEA695.

    4 Duplex chain. Order as part number 2H4905.

    NOTE: The engine front plate to main bearing cap screw holes need to be countersunk, and two AEA687 countersunk screws used to clear the chain. These are the original Allen key type of screw which are used in the steel kits and Phillips type head screw are used in the budget kits.

    BELT DRIVE KIT
    Belt drive kits help to restore power loss caused by original timing gear wear and stretching. Helps reduce noises associated with valve train and dampens out certain harmonic noises generated by the three main bearing ‘A’ series engine. Also gives exact timing where anything over 2° out causes power loss. The kit available contains everything to replace timing gears and cover.
    The less expensive alloy case version is being phased out by the millenium and replaced by the plastic case version, which has an upgraded crank gear (38mm thick) for racing. The plastic cover also has a recess section for advertising company logos
    .
    5 Belt drive kit with screw type variable adjustment when required.
        a Alloy case version. Order as part number C-AJJ3326.
        b Plastic case version. Order as part number C-AJJ3326RACE.

    6 Dowel type, where interrelated holes between cam boss and cam gear are located by a dowel to give exact timing that will never move, is in fixed increments of 1°.
        a Alloy case type    Order as part number C-AJJ3328.
        b Plastic case type Order as part number C-AJJ3328RACE.

    7 a Replacement belt for above,   Order as part number BELTBELT.

    8 a Replacement small oil seal for alloy case. Order as part number BELTSEAL1.
        b Replacement small oil seal for plastic case. Order as part number BELTSEAL3.

    9 Replacement large oil seal for above,   Order as part number BELTSEAL2.

    To aid accurate timing when using non adjustable
    timing gear systems, there is a range of proper CNC machined offset cam keys available. These come in 1° increments up to 9°. One tooth round on the gear represents 13° of cam timing, so if you are more than 9° out move the cam gear one tooth in the required direction and use the keys the other way round as they are bi-directional. They are available individually.

    10 Standard camshaft key, always replace with new camshaft.
              Order as part number WKN505.

    11 Off set camshaft key, represents 1° offset.. Change the
    number to order the required key, (ie. for 3°, WKN3 OSET). Available from 1° to 9°.
    Order as part number WKN1 OSET for 1° etc.


    Article Date: Jan 30, 2000
    Car Accociations: MINI,MORRIS,SPRITE,
    Hits: 2273


     

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