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Re: [Fot] spitfire head torque and valve adjustment

To: Gt6steve@aol.com
Subject: Re: [Fot] spitfire head torque and valve adjustment
From: Larry Young <cartravel@pobox.com>
Date: Tue, 16 Mar 2010 13:40:23 -0500
Ok, I'll jump in and try to make this way too technical.  Both methods 
are using the fact that the cylinder "mate" has it's lobes 180 degrees 
apart.  The rule of 9's is a bit more explicit, because it identifies 
the exact lobes which are 180 degrees apart.  For a 110 lobe separation 
and taking the first lobe to be 0, the other lobes are at angles of:
 0, 110, 20, 270, 90, 200, 290, 180
You can see that when lobe 1 is at zero lobe 8 is at 180 or exactly 
opposite.  Since two of the lobes are within 20 degrees of each other, 
you might as well set those at the same time as Jim and Steve suggest.  
Mark is setting the valves when the cam is split between intake and 
exhaust centers.  When the first two lobes are at +55 and -55, he would 
set the last two lobes, which will be 55 degrees on each side of 180.  I 
have a small concern with this method, because some lift curves can have 
ramps that extend 110 degrees are more from the centerline.  Adding that 
to the 55 gives you 165, which gives an allowance of 15 degrees for 
error.  If you're going to use this method, you need to make sure your 
cam doesn't have long ramps.  I use the other method for this reason.
Larry

Gt6steve@aol.com wrote:
> Now's the opportunity for the "Great Rocker Debate".  Seeing as how we  
> missed "Is it Vintage" this winter?
>  
> I adjust as Jim mentioned, Chuck adjusts on the rock as Mark says.
>  
> Pro's and cons?
>  
>  
> In a message dated 3/15/2010 10:07:03 A.M. Pacific Daylight Time,  
> mark@bradakis.com writes:
>
> Bobby  Whitehead wrote:
>   
>> We'll we're are a three Triumph car family, two race  cars now. The GT6 
>>     
> and now
>   
>> a 1965 Spitfire we bought from Mac out in  L.A.
>>
>>
>>   
>>     
> Nice.
>
>   
>> and I need the  valve adjustment sequence as I do not have a shop manual  
>>     
> yet.
>   
>>   
>>     
>
> Normally the way I do valves is turn  the crank until the intake and 
> exhaust for
> some cylinder are 'on the  rock' where the exhaust is just about closed 
> and the
> intake just  starting to open.  Then I adjust the valves for that 
> cylinder's  mate.
> On the Spits that would be cylinders 1 & 4 and 2 & 3.   If you follow the
> firing order it goes fairly  quickly.
>
>
> mjb.
>
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