[Fot] Mystery cam

[Bill Babcock]

I set it up like a Tiltech 298DX and got:
Intake 
45 BTC
71 ABC
Exhaust
82 ABC
35 ATC

Intake duration = 296
Exhaust duration 297
Intake lobe center 103 ADC
Exhaust LC 113.5 BTC
Lobe sep 108.3 
Overlap 80

Still doesn’t look quite right. 


> On Jun 14, 2016, at 10:46 AM, Bill Babcock <ponobill at gmail.com> wrote:
> 
> 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?
>> 
>