Carter AVS Part 2 on the car tuning

[Geoff 2]

Remcharger & SCG. You need to brush up on your reading skills..& your ignorance.

[1] Where did I recommend total WOT of 50*??????????????
[2] At cruise, some engines will need up to 60* of cruise timing. [ And in rare cases over 60* ]
[3] In this thread, I have not recommended any change to initial timing or the centri curve in the dist.
[4] What I am recommending is changing the idle timing...maybe you pair don't know the difference.

 

[Geoff 2]

Martin,
Back to the job at hand.
Your VA unit adds 16 crank degrees. The factory initial timing for that engine is 5*. I would advance that to 10*. If you get pinging, back it back down to 5*. So with 10* init, you need 20* from the VA unit to give you the ideal 30* at idle. The VA unit gives 16*, so you are short 4*. Note that 4 is 1/4 of 16.
You need to remove the VA unit from the dist [ dist itself can be left in place ].
With the VA unit on the bench, you can see how the arm pulls in until it hits the main body. You need to measure that travel distance. And increase it by 1/4. Example: arm moves 0.160" to the stop. That distance needs to be increased to 0.200". You do that by filing/grinding the stops on the arm to get the reqd amount.
While you have the VA unit out, attach a hose & suck on it to make sure the arm moves until it hits the stop.
Turn the Allen head fully CW until it stops or clicks. VA unit can now be refitted.

Connect VA unit to manifold vacuum, start & warm up engine. Check/set initial timing once engine is warmed up. Then re-adjust idle speed/mixture screws. Do all this in gear if auto trans.

Ready for a test drive.