CorvAircraft> interpreting GM cam specs

[John Brannen]

Michael,

Is your question for the stock 110 Corvair cam??  If
so, I have degreed the stock cam in my 110 and can
send you the specs.  Let me know.  The basics of the
cam specs I measured are:

Measured specs @ 0.050 lift at lifter 
EXH lift at lifter : 0.257" = 0.400" lift at valve    
            
INT lift at lifter : 0.258" = 0.402" lift at valve
    (Note: lift at valve assumes a rocker ratio of
1.56)
IVO: 3 ATDC                                  
IVC: 220 ATDC=40 ABDC          
INT Duration: 217 degrees
EVO: 220 BTDC=40 BBDC             
EVC: 3 BTDC                            
EXH Duration: 217 degrees

I have plots of the cam profiles for all 720 degrees
of crank rotation with measurements taken every 20
degrees if you want them.

John B.

--- Michael Amick <mkamick at bellsouth.net> wrote:

> Someone sent me the following spec's on a GM cam to
> compare with the 
> OT-10.  He got this from a Corsa tech guide circa
> 1986. 
> 
> Does anyone know the algorithm to convert these
> numbers in the form of:  
> intake valve open @ xx BTDC / closed@ yy  ABDC  etc.
> 
> "Cam specifications  are:  
> with ramps       intake 70-110  lift .392 exhaust
> 110-70  lift .392  
> without ramps  intake 58-86                  exhaust
>   98-46.
> 
> Always something more to learn!
> 
> Regards
> Michael Amick
> > No virus found in this incoming message.
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> >
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