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Join Date: Nov 2005
Location: brampton, ontario
Posts: 67
cam timing 3lt. turbo

I just bought a dial gage and holder to begin timing the cams.
I have set the crank at the Z1 mark and brought the left cam marks pointing up, adjusted the intake valve to .004.
According to my manual;
" The cam timing of the turbo-engine is set at 0,65 +/_ 0.15 mm, intake valve stroke at overlapping TDC with 0.1 mm valve clearance".
now here is my question, am I looking for this measurement at the Z1 mark after rotating 360 deg just as the valve starts to move.
Also my gage is in 1" reading .001" and how do I tell the exact convert ion for metric?
Any reply would help me a lot on this
Tas

Old 06-20-2006, 03:01 PM
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Join Date: Jun 2004
Location: Rio Rancho, New Mexico
Posts: 1,325
Tas,
39.37 thousandths per 1.0mm. So 0.65mm=25.59 Thousandths. Call it 26 thousandths and you won't go wrong.
Turn the motor clockwise, never ccw, to exactly Z1.
The dial gauge should begin moving 6 or 7 degrees before Z1.
Once you are at Z1, read the dial indicator.
Make certain the dial indicator is straight with the rocker screw.
Turn the motor over two turns and recheck.
Remember you are working at Z1 crossover, the exhaust valve has just closed and the intake is just beginning to open.
At Z1 crossover for #1 cylinder, the the left cam marks will be upside down, the keyway will be down.
At Z1 crossover for cylinder #4, the right hand cam the marks will be up, the keyway for the right hand cam will be up.
Number 1 and No. 4 are 360 crank degrees apart. 180 cam degrees apart.
Piece of cake,

__________________
DOUG
'76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's.
'85 911 Carrera, stock, just painted, Orient Red

Last edited by 2.7RACER; 06-20-2006 at 04:12 PM..
Old 06-20-2006, 04:01 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
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