[Fot] Mystery cam

[Bill Babcock]

It’s the cam that was working so well. Pretty sure it’s a BFE, but no, I”m not letting this go until I know. Right now the numbers are totally screwball, but I’ll figure it out. 


> On Jun 14, 2016, at 1:46 PM, Kas Kastner <kaskastner at gmail.com> wrote:
> 
> It is difficult for me to believe that Bill is just going to say "oh what the hell, I'll just put it in"   :-)
> 
> Never be beaten by equipment.
> 
> 
> On Tue, Jun 14, 2016 at 10:46 AM, Bill Babcock <ponobill at gmail.com <mailto: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 <mailto: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 <mailto: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?
> >
> 
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