advancing my timing. a couple quick questions
i borrowed a timing light from my friend and checked the timing on the FC (91 gxl) with the intent of running 6 or 7 degrees more timing. so i turned the CAS clockwise and the mark on the crank pulley (only one mark.. ?) moved towards the passenger side about 6 or 7mm's (just making sure that i'm advancing it instead of retarding it).
1. how many degrees is 6-7 mm's on the crank? i was thinking that a 1cm advance is about 9 or 10 degrees. 2. how much advance can i run on stock fuel? 3. can i turn the CAS as far as it will go? it looks like it will only advance the timing 10-12 degrees at full lock. 4. is it a problem that i only have one mark on my crank pulley? |
13 views and no replies. come on people
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On the stock pulley there s/b 1 red and 1 yellow mark. On my rx7.com underdrive pulley, 1 inch is like 10 degrees on the pulley. I don't know if they are the same diameter.
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so can i turn the CAS clockwise to full lock? how many degrees would that advance me?
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What color mark do you see? There should be a whitish yellow one for the lead timing, then about 1/4 inch behind that (to the left, or counterclockwise, how ever you want to call it) should be a red one for the trailing timing.
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3. can i turn the CAS as far as it will go? it looks like it will only advance the timing 10-12 degrees at full lock. 4. is it a problem that i only have one mark on my crank pulley? |
360 in one rotation, IIRC the dia of the pulley is about 3.5", mult by pi to give circumference ~10" so 1" is about 36 deg.
Verify the dia though as I'm not sure if its 3.5" and recalc. Henrik 87TII |
too much advance = pop goes the motor, i learned the hard way :)
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too much advance = pop goes the motor, i learned the hard way :)
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It is possible to set the timing to where it could ignite the air/fuel in the pocket while the apex seal is below the trailing plug and above the leading plug. The trailing plug igniting the oncoming air/fuel mixture will try to spin the rotor backwards.
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hey drox i found the other timing mark on the crank. i just turned the timing back down and lined up the leading mark then the trailing mark. i'm gonna leave it at the stock -5 btdc until i can get a non-ghetto timing gun.
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