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L92 Comp Cams VVT Cam Kit Install - Timing is Every Thing

Comp Cam's New VVT Cam Kit For L92s Nets Big Gains
By Scott Parker
Photography by Scott Parker
L92 Comp Cams Vvt Cam Kit Install Installing Camshaft
For years the imports, and... 
   
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L92 Comp Cams Vvt Cam Kit Install Installing Camshaft
For years the imports, and even the blue oval boys, have been using variable valve timing (VVT) technology to experience increased power gains throughout a broader rpm range. Though more common with overhead cam engines, in 1991 Clemson University came up with a design that would also allow pushrod engines to utilize optimized cam timing.
L92 Comp Cams Vvt Cam Kit Install Valve Timing Cam
As you can see, the design... 
   
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L92 Comp Cams Vvt Cam Kit Install Valve Timing Cam
As you can see, the design of the variable valve timing cam is radically different than your standard Gen III (or even Gen IV)...
L92 Comp Cams Vvt Cam Kit Install Variable Valve Timing Cam
...The holes through the barrel... 
   
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L92 Comp Cams Vvt Cam Kit Install Variable Valve Timing Cam
...The holes through the barrel of the cam channel pressurized oil, feeding the phaser, which bolts to the face of the cam instead of a fixed timing sprocket.
L92 Comp Cams Vvt Cam Kit Install Bolt That Holds The Phaser
The bolt that holds the phaser... 
   
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L92 Comp Cams Vvt Cam Kit Install Bolt That Holds The Phaser
The bolt that holds the phaser to the cam is actually a valve, which feeds a number of holes in the phaser. Pulse width modulation controls how much oil pressure is fed into the phaser, which in turn makes the cam timing retard. When there is no pressure it is locked to full advance.
L92 Comp Cams Vvt Cam Kit Install Hooking L92 Engine To Dyno
First we base-lined the stock... 
   
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L92 Comp Cams Vvt Cam Kit Install Hooking L92 Engine To Dyno
First we base-lined the stock GM L92 motor using the factory computer and Dynatech long tube headers. The healthy 376-cube motor made 430.3 hp and 434.7 lb-ft on the SuperFlow engine dyno.
L92 Comp Cams Vvt Cam Kit Install Removing Crank Pulley
COMP Cams Research and Development... 
   
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L92 Comp Cams Vvt Cam Kit Install Removing Crank Pulley
COMP Cams Research and Development Dyno Operator Rich Smith started breaking down the L92 for the cam transplant and phaser modification by removing the crank pulley...
L92 Comp Cams Vvt Cam Kit Install Removing Water Pump
...and water pump.
L92 Comp Cams Vvt Cam Kit Install Removing Timing Cover
The timing cover comes off... 
   
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L92 Comp Cams Vvt Cam Kit Install Removing Timing Cover
The timing cover comes off next-note the difference in shape from your Gen III cover and the electronics that control the phaser.
L92 Comp Cams Vvt Cam Kit Install Camshaft Positioning Actuator Magnet
The bolt, that as previously... 
   
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L92 Comp Cams Vvt Cam Kit Install Camshaft Positioning Actuator Magnet
The bolt, that as previously mentioned is actually a valve, is controlled by an electromagnet. GM technically calls it a "Camshaft Positioning Actuator Magnet." The back of the electromagnet and connector can be seen when looking at the timing cover externally. On the inside of the timing chain cover is a small pin that is controlled by the electromagnet, which has a range of motion of approximately .250-inch. This pin is what physically pushes on the cam phaser valve/bolt to control the oil pressure being fed in and out of the phaser. The electromagnet is controlled by the PCM.

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