View Full Version : 1993 to 1999 Cam Wear Fix

06-06-08, 07:02 AM
I found a fix for the cam wear on 1993 to 1999 Northstars.

Electronic Valve Control

An electronic valve control (EVC) system replaces the mechanical camshaft, controlling each valve with actuators for independent valve timing. The EVC system controls the opening and closing time and lift amount of each intake and exhaust valve with independent actuators on each valve. Changing from a mechanical camshaft driven valve into independently controlled actuator valves provides a huge amount of flexibility in engine control strategy.

Vehicles utilizing EVC can realize several benefits including:

Increased engine power
Greater fuel economy
More environmentally friendly emissions

With all of the improved efficiencies and consumer benefits, auto manufacturers are eager to get their first EVC systems on the road.

The EVC system is targeted to operate in temperatures up to 125C, while the actuator is targeted to run up to 6000 rpm. The actuator can be controlled in a centralized system with a high-speed multiplex bus (up to 10Mbps) or in a distributed system with a nominal speed bus.

Key Benefits

Increases engine power and fuel economy
Allows centralized and distributed EVC systems to perform at their full potential
Adapts to engines of varied cylinder counts

Design Challenges

EVC systems must be compact in size, specifically the actuators that must be small enough to fit in the engine space. A vehicle that uses a 42 V system is ideal for EVC because it requires high voltage to control the valve actuators, and EVC is targeted for V8 and V12 engines. The EVC system is also highly flexible, allowing adaptability for a number of cylinder engines.


Freescale Semiconductor is developing solutions to meet customer requirements. Freescale's MPC565 microcontroller, which implements the PowerPC architecture, targets high-performance applications like EVC. With this powerful processor at the heart of an EVC system, both centralized and distributed systems can be developed to perform at their full potential.

For a centralized system, a central processor will be designed to communicate with a local node that exists on each cylinder. A high-speed bus (up to 10 Mhz) will be used for communications. The local node is engineered with a communication layer for the master interface, valve control timings, and valve actuating parts. An important benefit of using Freescale's highly integrated solution is that silicon cost is minimized by using a centralized system approach.

FlexRay, the communications bus for advanced vehicle applications, is engineered to address the needs of complex systems like EVC. It is ideal for the high-speed communication layer of the EVC system due to its high-speed capabilities (up to 10Mbps), fault tolerance, and tight synchronization.

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06-06-08, 02:05 PM
LOL... bet that's still 10+ years out. And a 6000 RPM limit? Weak...

06-06-08, 06:14 PM
LOL... bet that's still 10+ years out. And a 6000 RPM limit? Weak...

it was 10 years out in 1986 when I heard about it on test engines.

6000 would be enough by far.
You could have continuous variable Lift, Duration, Cam Timing, and Cylinder Deactivation.

I guess you could get some type of flat torque curve and the Horse Power could get a lot flatter also.

Know add a CVT Transmission and you have the best of both.

06-07-08, 10:48 AM
Well, 6000 RPM would be plenty for a diesel. And in the right application, it should work very well.

So this has been 10+ years out since 1986? Why, too expensive?

06-07-08, 10:58 AM
If the actuators are targeted to run a 6,000 rpm valve event, that's 12,000 engine rpm in a 4-cycle (the valves run at half speed.......)

I suspect the size and complexity of the individual valve solenoids is a drawback.......a fuel injector operates on essentially the same principle, but we're talking incredible differences in moving mass and heat dissipation between an exhaust valve and fuel injector needle...

06-07-08, 07:17 PM
Don't F1 cars use pneumatic valve control?

Either way, it's pretty stupid. Replace a lobed hunk of steel with $5000 worth of electronics and batteries. I'm sure it will get worse gas mileage thanks to the 1000A alternator that powers it all.

Nope, ZDP is the one for me.