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Old 04-10-2009, 10:23 PM   #1
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Default judging Valve events on miata heads

I would like to set my cam timing but cant see any reliable way to get an indicator on the valve bucket. Does anybody have a method for doing this?

I've used a leak down gauge to determine valve openings but that gives a "just off seat event" which is reproducible but doesn't compare to any published reference point.
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Old 04-11-2009, 12:06 AM   #2
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Dial test indicator on top of bucket. Measure from 0.050" to 0.050".
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Old 04-11-2009, 12:36 AM   #3
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That test indicator is probably more precise then you need for measure when the seat is fully closed or open, try this:

Summit SUM-900016 - SummitŪ Magnetic Base and Dial Indicator Kits

you'll also be able to use it for measure backlash on diff gears, setting bearing tolerances and loads of other things. It has a 1" range while the test indicator, although precise down to .0005" (some go to .0001") it only has a .1" range.
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Old 04-11-2009, 02:38 AM   #4
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you guys missed the part where he can't get a reliable place to read on the bucket...
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Old 04-11-2009, 04:39 PM   #5
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Oh, right. Try the cam lobes.
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Old 04-11-2009, 06:57 PM   #6
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Thanks, I may be able to get the test indicator in there. Ill try when I have the cover off next. I couldnt see any way to get anything that shoots straight at the bucket.

If I profile the cams then I can probably extrapolate the .020 opening event from when the seat first lifts. Thats a lot of work though.
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