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Registered
Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
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Thank you, Herr Moderator. We did meet - Traverse City, maybe?
Just the stuff I need to know ahead of time. Luckily, I think most if not all of the 944s racing have removed the headlight stuff. And there are a lot more NA 944s racing than 951s if they have plumbing in that area. The 944 system looks to be almost identical to the 3.2 911 system, though with less convenient access.
John - I've got one of those sitting in my garage, and about to be transferred to my desk where I type. Look at those 8 holes. With a cleverly fabricated bent this way and that indicator tip I should be able to get on the cam lobe, and maybe even on the lifter (which means you can use a small tip, and are timed like the engine is). It seems that guys use something like this to check cam timing? Though that may not require following the whole cam profile? There are a few places on which to attach an indicator holder, including others of those head bolt access plugs.
That's the plan, anyway.
The 911 system is coming along. Next is building a plot where there is either a band instead of a point line, reflecting the couple of thousandths of tolerance and measurement variation, or just a line which takes into account variation which can be used to see if a cam whose three main maxima are OK also stays within that profile.
Plus I need to figure a convention to measure duration on the cam lobe - the Porsche specs involve 0.1mm lift at the valve, so we may have to invent one for the opening and closing lifts on the lobe. Since this will be arbitrary, I suppose I could apply a 1:1.65 ratio backward to see what exhaust cam lift would would approximate exhaust valve lift.
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