I can reason that the cam sensor tells the ECM where #6 is to start the firing sequence of the injectors.... If I understand this.... the theory is to inject the fuel at the correct time to not allow any puddling of fuel and maximize the efficiency of the fuel being sucked into the combustion chamber. With that said.... I could argue... that I buy into the concept that a larger cam has the intake valve opening sooner because of the increased duration...... and that all things equal... it would seem logical that you needed to advance the cam sensor timing by the same number of degrees that the intake valve has opened sooner....
Example:
Not sure of the stock cam specs.... but for arguments sake lets say it is basically 194 @ .050 on the intake.... lets say I plan on running a 218 cam...... for the sake of argument... lets say they are installed on the exact same intake centerline.....so therefore there is 24 degrees total difference in duration (@.050).... therefore... since they are on the same centerline....the intake valve (could confirm with cam card) opens 12 degrees sooner........ so if I want to inject fuel at the same time relative to the opening of the intake valve... I would need to "advance" the cam sensor by 12 degrees.
Did I hit my head? Or does this make any sense?
I found an interesting thread on this over on another board. It says.... it can affect the way it runs... especially at a higher RPM..... but shouldn't affect the timing at all of the injecotrs.... this subject gets muddied yet again....
cam sensor timing thread
Example:
Not sure of the stock cam specs.... but for arguments sake lets say it is basically 194 @ .050 on the intake.... lets say I plan on running a 218 cam...... for the sake of argument... lets say they are installed on the exact same intake centerline.....so therefore there is 24 degrees total difference in duration (@.050).... therefore... since they are on the same centerline....the intake valve (could confirm with cam card) opens 12 degrees sooner........ so if I want to inject fuel at the same time relative to the opening of the intake valve... I would need to "advance" the cam sensor by 12 degrees.
Did I hit my head? Or does this make any sense?
I found an interesting thread on this over on another board. It says.... it can affect the way it runs... especially at a higher RPM..... but shouldn't affect the timing at all of the injecotrs.... this subject gets muddied yet again....
cam sensor timing thread