I may be in the minority here, but I don't use the 0.050 numbers when I
set up a cam. I set it strictly using intake lobe centerline, which is
what Tony is suggesting. The reason for this is that you can measure the
centerline more accurately. Rather than just measuring at 0.050 on each
side, I suggest you measure the open and closing angles at lifts of
0.200, 0.250 and 0.300 or something similar. This will give 6 numbers
that when averaged will give a very accurate centerline number.
Probably overkill when you can only get within + or - 2 degrees, but you
will know what you've got. And yes, always turn the crank in the
direction the motor turns, so you have tension on the chain.
Larry Young
Tony Drews wrote:
> Set your specs with tension on the chain. Also, verify that the
> closing event is where you expect. Sometimes the duration between
> opening and closing doesn't exactly match the cam card, and you really
> want the centerline on the cam card spec. So, if I have the opening
> on time but the closing is two degrees late, I move the opening one
> degree earlier so I split the difference. Then it opens one degree
> early, closes one degree late and the centerline should be where I
> want it to be.
>
> - Tony Drews
>
> At 09:53 AM 6/7/2009, Mark Pendergrass wrote:
>> FOT'RS; It's crunch time for me out west here, i have a question. I
>> have a
>> Erson B23 cam that i'am try to set up in relation to my crank. After
>> a couple
>> of tries i got the crank/cam set to erson specs. 29BTDC with 50 thou.
>> lift on
>> intake lobe.When i take the cam chain tensioner and put pressure on
>> it as it
>> would have with the cover in place, it wants to throw my cam setting
>> off by
>> 5-6 thou.Do i set my specs with tension on chain or not??? I need
>> some input.
>> Thank You !!!! Mark Pendy #65 tr4
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