Course those of us with a 6 use the rule of 13.
On Tue, Mar 16, 2010 at 12:51 PM, Kas Kastner <kaskas@cox.net> wrote:
> I too always used the rule of 9. Takes all worries out of the cam design.
Good comment of the ramps being long on some designs, that was another thing I
liked a lot.
> ---- Larry Young <cartravel@pobox.com> wrote:
>
> =============
> 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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>> _______________________________________________
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>
> _______________________________________________
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>
> --
> Never be beaten by equipment
>
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--
Chuck Arnold and Kathleen Kelley
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