Intake Adjustable Cam Gear Moves Ignition Timing?

[set3422]

Does anyone know if I adjust the intake cam degree I would need to re-adjust my ignition timing? The CAS is mounted on the intake cam. Before I made any adjustments on the cams, I wasn't getting any knock. After 9 deg advance on intake, I was getting huge amount of knock (43 counts of knock). I reduced the advance on intake cam to 5 deg and seems like doesn't knock as much. The ignition timing is set at 5 deg base. I know if you advance to more than 7 deg, you'll get knock. I didn't physically move the CAS, but you guys think the intake adjustable cam gear can advance it from inside. Thanks.

 

[anoldsman]

When you change the cam timing on your intake cam it will also change the CAS settings. Even though you have not rotated the CAS housing, you have rotated the CAS sensor in relation to the housing.

Chris

 

[set3422]

Hey what's up Chris? So that means I would have to re-adjust my CAS to get 5 deg base timing? Thanks. I spoke to Road Race and they said the power band changes according to the new adjustment the CAS is picking up now. But as far as base timing it would still remain the same according to them. I'm going to verify this with a timing gun and see if the base timing still remains the same as before without the adjustable cam gear. Thanks.



Set,

 

[set3422]

Alright I checked my ignition timing and here is what I found:


-At 5 deg advance on intake, ignition timing went up to 7+/- 2 deg.
-At 9 deg advance on intake, I.T. went up to 10 +/- 2 deg.

I retarded I.T. couple degrees on the CAS, so now knock is all gone. Hopefully this will help someone in the future.



Set,

 

[set3422]

I spoke to Road Race and they said the power band changes according to the new adjustment the CAS is picking up now. But as far as base timing it would still remain the same according to them. I'm going to verify this with a timing gun and see if the base timing still remains the same as before without the adjustable cam gear. Thanks.



Set,

This is my last post I get charged for bumping threads..... Road Race knows their sh*t. The reason they told me the ignition won't change because I forgot to tell them that I have a 1g. They are telling me adj cam on intake won't change ignition base timing because 98-99 2g's (majority of their customers) mount their CAS nearby the crank pulley. You can adjust intake cam on 2g all you want and still won't change any values on the CAS, but this is not the case with 1g. Hopefully this will become helpful to someone in the future. Thanks.