[Fot] Mystery cam

[Bill Babcock]

Searching around on the web, it kind of looks like a TilTech 298Dx, but I don’t recall buying a cam from Larry and Tony Garmey doesn’t think so either. I could just set it up as if it were, but it would be good to know. 


> On Jun 14, 2016, at 10:40 AM, Bill Babcock <ponobill at gmail.com> wrote:
> 
> Oh, and the lift is .372
> 
> 
>> On Jun 14, 2016, at 10:11 AM, Bill Babcock <ponobill at gmail.com> wrote:
>> 
>> I’m building a new motor for Peyote from the bits of it’s previous engine. I discovered the front main bearing cap was cracked in half when I decided to freshen the motor. I’ll work on replacing the cap later—maybe get a billet one made, but in the meantime I’ve run into a minor problem. I don’t know for sure what cam I have or how it should be set.  Tony Garmey says it’s a BFE cam, but I can’t find any specs for those and can’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 0.033” as the open/close height which is .050/1.45 which as I recall is the ratio of the stock rockers”
>> Intake open .033 @ 36 BTC
>> Intaake close .033” @ 76 ABC
>> Exhaust open .033” @ 76 ABC
>> Exhaust close .033” @ 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 isn’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?
>