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when should the dizzy point @ #1?

Old Apr 22, 2006 | 12:08 AM
  #1  
TraviZ's Avatar
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From: Woodland, CA
Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
when should the dizzy point @ #1?

finding TDC, stupid question im sure, but anyways, with the valve cover off on #1, should the dizzy be stabbed when the intake valve closes? or right before the exhaust valve opens? or in between? thanks
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Old Apr 22, 2006 | 12:15 AM
  #2  
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Umm... I typically start corner to corner with the piston at TDC so I'm close, I don't go by the valves for anything but figuring which stroke I'm on. :shrug: I'm sure there are going to be a slew of methods mentioned.
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Old Apr 22, 2006 | 12:19 AM
  #3  
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what do you mean by this "corner to corner"?
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Old Apr 22, 2006 | 12:32 AM
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When you look at it I have the leading corner of the rotor just into the facing corner of the post.

rotor ---------
------- post

If that comes out it'll be a really crappy visual, but should make more sense than me trying to explain it.
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Old Apr 22, 2006 | 12:47 AM
  #5  
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You,ll be close if you go by the intake valve closing, which is all you need until the engine starts up then you can set the timing to specifications. If the piston is at compression stroke TDC the dizzy rotor should be just about to break contact with the post.
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Old Apr 22, 2006 | 12:48 AM
  #6  
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sweet i think i got it.

the exhaust valve opens up when the piston is near the bottom of the power stroke, correct?
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Old Apr 22, 2006 | 01:28 AM
  #7  
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Car: 1987 Camaro SC, 1999 Z28
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Originally Posted by TraviZ
sweet i think i got it.

the exhaust valve opens up when the piston is near the bottom of the power stroke, correct?
yes, the piston is then shot back up, expending the used gases through the valve.
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