Damn, Iâ??ve been staring at this too long. Of course youâ??re right. I bit the
bullet and pulled off the rocker arms to do it right and now the numbers are
even more confusing.
> On Jun 14, 2016, at 1:08 PM, Duncan Charlton <duncan.charlton54@gmail.com>
> wrote:
>
> Hi Bill,
>
> If I understand you right, you measured lift at the valve itself, in which
> case it looks to me that you did the rocker arm equation backwards. 0.050â??
> lift at the cam should see a greater movement at the valve, not a lesser
> degree.
>
> I hope you ended up with a Tiltech cam â?? thatâ??s what I would choose if I
> could get one today.
>
> Duncan
> (Texas)
>
>> On Jun 14, 2016, at 12:11 PM, Bill Babcock <ponobill@gmail.com> wrote:
>>
>> Iâ??m building a new motor for Peyote from the bits of itâ??s previous
>> engine. I discovered the front main bearing cap was cracked in half when I
>> decided to freshen the motor. Iâ??ll work on replacing the cap laterâ??maybe
>> get a billet one made, but in the meantime Iâ??ve run into a minor problem.
>> I donâ??t know for sure what cam I have or how it should be set. Tony
>> Garmey says itâ??s a BFE cam, but I canâ??t find any specs for those and
>> canâ??t get ahold of Ken.
>>
>> I ballparked where I think the cam might want to be and got this for
>> measurements:
>>
>> Reading the Intake and exhaust valve movement from the spring retainers I
>> use 0.033â?? as the open/close height which is .050/1.45 which as I recall
>> is the ratio of the stock rockersâ??
>> Intake open .033 @ 36 BTC
>> Intaake close .033â?? @ 76 ABC
>> Exhaust open .033â?? @ 76 ABC
>> Exhaust close .033â?? @ 42 ATC
>>
>> By my calculations that gives:
>> Intake duration 292.0 degrees
>> Exhaust duration 298 degrees
>> Intake lobe center 110.0 ATC
>> Exhaust lobe center 107 BTC
>> Overlap 78
>> Lobe separation angle 108.5
>>
>> Pretty sure this isnâ??t exactly where it needs to be. I have a vernier
>> sprocket so I can adjust the timing precisely. My questions are:
>>
>> What cam is this?
>> Where should it be set?
>> How much advance?
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>>
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>
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