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Czar of C.R.A.P.
 
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Join Date: Jul 2003
Location: Fremont Nebraska
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questioning backside valve adjustment

Trying to set valves on my rebuild. Using the backside method of adjustment with .0025 and .003 for the gauges. If I set this way then install a dial indicator I get .003 after adjustment. I know this method was developed for a 2.7 is the rocker ratio different for a 3.2 carrera.
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92 C4 Coupe
84 Carrera Cab Hardtop HC3.4 Hyper Carrera
2005 Dodge Magnum 5.7 HEMI
Cabriolet Racing And Performance C.R.A.P. Gruppe #1
Put on some C.R.A.P. and drive....
Old 01-12-2007, 07:10 AM
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I Calls em as I sees Em
 
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I dont see how the ratio would make a diff....
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"Kracklin Rosie"....1975 S, red duck, 2210 lbs total ( full tank). No front license plate. I have issues. I calls em as I sees em.................
Old 01-12-2007, 06:41 PM
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Same rocker from at least '72 to '89. Part no. 901 105 043 00.
The rocker ratio does make a difference.
The ratio is 1.4 to 1 when the rocker is resting on the base circle of the cam.
Simple math. Divide .004" by 1.4 and you get a number between .0025" and .003".
Thus the entire premise to the backside method.
If the gap is set at .004" at the elephant foot and valve, the gap at the rocker and cam base circle will be between .0025" and .003".
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'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
Old 01-12-2007, 11:30 PM
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thus we all get a education...thanx,,,
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"Kracklin Rosie"....1975 S, red duck, 2210 lbs total ( full tank). No front license plate. I have issues. I calls em as I sees em.................
Old 01-13-2007, 06:23 AM
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Czar of C.R.A.P.
 
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I guess I don't know why it didn't work on mine then. If I did the backside as described then tested with a dial indicator I only had .003 gap. I wound up using the dial on all the valves.
__________________
92 C4 Coupe
84 Carrera Cab Hardtop HC3.4 Hyper Carrera
2005 Dodge Magnum 5.7 HEMI
Cabriolet Racing And Performance C.R.A.P. Gruppe #1
Put on some C.R.A.P. and drive....
Old 01-13-2007, 10:41 AM
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