Re: [Amc-list] Super Long Intake Duration Cam ???

[David Crooks <david.crooks@xxxxxxxxxxxx>]

I haven't heard of such a cam, and frankly, I don't believe it could  
work...

The relationships between cam timing, duration, and rpm are reasonably  
well understood, and the cold fact is that there is no one grind  
that's best for both low rpm and high rpm operation.  That's the whole  
reason that modern high performance motors are using variable timing  
on the intake and exhaust cams.   Reduce the compromise, for the best  
of both ranges...

Cheers,  Dave
-----------------------------

There was an interesting paragraph that briefly discussed how they had  
some custom camshafts ground, which increased the intake duration ?  
way through the compression stroke, basically making an 8:1 engine act  
like a 16:1.? The torque curve would keep climbing way up past 4,000  
RPM and at higher RPMs the engine had almost a ram effect to it (self- 
supercharging).? On a 350 motor they did this to, the mileage  
increased from 16 to 23 MPG and the power increase was amazing.? The  
carb company (somewhat like a co-op) had the cams custom ground by  
either Crane or Comp Cams, I think ? but since they were more like a  
co-op, they stopped promoting it because they were getting inundated  
with phone calls asking how to set up their engines for such a cam,  
instead of being able to focus on producing the Fish carburetors (from  
1983-1996).

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