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Re: [Fot] Mystery cam

To: Bill Babcock <ponobill@gmail.com>
Subject: Re: [Fot] Mystery cam
From: Dean Tetterton <tr3a58@verizon.net>
Date: Tue, 14 Jun 2016 16:03:09 -0400
Cc: Friends of Triumph <fot@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: fot@autox.team.net
References: <294DA329-A981-49E4-BE88-7A1E0B27DA73@ponostyle.com>
Kens cam were made by Steve Long, SLR Cams, 119 North Maple Street, SUITE H, 
Corona, CA  92880
951-273-0816
He might be able to help you identify which grind it is.

Dean


On Jun 14, 2016, at 1:11 PM, Bill Babcock 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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