Re: alfa-digest V8 #309 - Cam timing

[AlfaNeely@domain.elided]

In a message dated 12/19/2001 10:02:25 PM Central Standard Time, 
owner-alfa-digest@domain.elided writes:


> Date: Wed, 19 Dec 2001 15:38:04 -0800
> From: Joe Martin Cantrell <agiyo@domain.elided>
> Subject: 1 Cam change
> 
> When you wish for your engine to speed,
> And produce all the power you need,
> If it's one cam you're buying,
> The exhaust ain't worth trying,
> The intake's the one that you need.
> 
> The exhaust should retard 'bout one hole,
> Intake advanced 5 then you'll roll,
> When the chain is retightened
> Other racers be frightened,
> At the new speed you've found, you'll be droll.
> 

       Cute little poem.  First paragraph I agree with.  Second paragraph is 
in error.  Former AROC Tech Advisor Joe Bensons advice from years ago for 
livening up the Spica cam timing was one notch advance on the intake and five 
notches retarded on the exhaust.  Your poem moves the intake five, which is 
wrong.
       By notch, this means you move the bolt that many holes.  Due to the 
different number of holes on the cam and on the sprocket, the movement of the 
cam timing itself is less than half a hole even on the exhaust.  Hope this is 
clearly stated.
       Also when rolling the cams, you start with the cams point away from 
each other.  When done, they will be less away from each other.  That is, you 
have increased the overlap by rolling the cams together.
       As an aside, I find it almost impossible to get the cam timing exactly 
lined up.  Therefore, I tend to error in the direction suggested by Mr. 
Benson.  If I cannot get the intake exact, I error toward a slight bit of 
advance.  And on the exhaust, I error toward a retarded.  In both cases, I am 
moving the cam marks slightly toward the spark plugs than exactly in the 
center of the mark.

Ciao,
Russ Neely
Oklahoma City

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