Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by: KPower

judging Valve events on miata heads

Thread Tools
 
Search this Thread
 
Old 04-10-2009, 09:23 PM
  #1  
Newb
Thread Starter
 
Fritz's Avatar
 
Join Date: Sep 2008
Posts: 32
Total Cats: 0
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.
Fritz is offline  
Old 04-10-2009, 11:06 PM
  #2  
Senior Member
iTrader: (5)
 
The_Pipefather's Avatar
 
Join Date: Nov 2007
Location: Troy, MI
Posts: 854
Total Cats: 14
Default

Dial test indicator on top of bucket. Measure from 0.050" to 0.050".
Attached Thumbnails judging Valve events on miata heads-dti_y.jpg  
The_Pipefather is offline  
Old 04-10-2009, 11:36 PM
  #3  
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,179
Total Cats: 1,129
Default

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 - Summit® 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.
curly is offline  
Old 04-11-2009, 01:38 AM
  #4  
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,338
Total Cats: 573
Default

you guys missed the part where he can't get a reliable place to read on the bucket...
y8s is offline  
Old 04-11-2009, 03:39 PM
  #5  
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,179
Total Cats: 1,129
Default

Oh, right. Try the cam lobes.
curly is offline  
Old 04-11-2009, 05:57 PM
  #6  
Newb
Thread Starter
 
Fritz's Avatar
 
Join Date: Sep 2008
Posts: 32
Total Cats: 0
Default

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.
Fritz is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Tony the Tiger
Miata parts for sale/trade
63
12-29-2016 02:23 AM
tottestad
Miata parts for sale/trade
18
09-14-2015 07:52 PM
vehicular
General Miata Chat
12
09-14-2015 03:17 PM
Voltwings
WTB
5
09-11-2015 08:23 AM



Quick Reply: judging Valve events on miata heads



All times are GMT -4. The time now is 12:54 PM.