sunday nigh thought rotor phasing.....again !!!!!

ok follow me here we were at the track last night fighting the same old deal when we change mags and my buddy says hey you know when we get this dam rotor phasing right lets hook the car up and run it on the mag,record where the timing is no matter what the number then the next time we put it in we can set it right back to that number as a referance for the phasing ? why wouldnt this work ?

 

that's what we thought it should get you really close after you get it right then document the reading with it running on the mag before changing it mike do you set urs with the car running or set it before you crank it ? with the movement of the rotor when the engine is running our was different when we set it with the engine off then checked it after we started it

 

so we just tried to phase it without starting it on the mag first it started and ran but we had issues then we checked the timing on the mag only and it was way off so we need to get it right then phase it correct

 

I have an upper mag clamp/bracket that is adjustable so you can turn the mag with no problems when the motor is running. Kevin Cantrell 602-918-4945

 

phasing

the timing your checking on the mag only is the mag pickup timing
thats not phasing
the big cap and rotor have three screws on the cap adapter that you phase it with
the small cap and rotor are not adjustable so no phazing that i know of
i get confused sometimes also so double check me 1st

drill a hole in the cap and look at rotor to #1 terminal
at 26 degree you should be on the leading edge
at say 10 degree with tb button pushed it shoould be on the trailing edge
or split the difference
if im wrong let me know but thats how i do it

 

phasing

and their is somekind of 5 degree offset with the 8973 plugged in
i always set and check mine with 8973 plugged to crank trigger and mag
never plug the mag into itself or you may be off 5 degree when you plug the 8973
back in
again double check me i might be wrong

alton you going to gateway mickey thompson shoot out

 

duane we may come if i can get this pos to run thats a hell of a pull to test! we are going to take it this weekend to see if we can figure it out but this dam phasing deal kicks our butt almost every year so does the mag timing and the magnet pop have anything to do with rotor phasing on the trigger ?

 

phase

Not to add confusion but here's how I do it.
Eyeball the rotor to #1 with the mag trigger connected and start the car.
Set it to around 5 degrees less than the timing you want on the crank trigger. That way when you dump timing on the starting line it doesn't go sa far out of phase that it farts/misses.
Disconnect mag trigger and start the car with the crank trigger and the 8973 hooked up.
Adjust the crank trigger as required or dump some timing on a step retard with the 8973.
The only trouble we ever had was running a promag 12 with a small cap. If you set the mag correct with the crank trigger the car would fart and miss when the timing was dumped. The 44 had enough heat to jump the gap and cleaned it up but no increase in performance.
The way I see it, the cap is intentionally out of phase to help stay clean when a lot of timing is pulled out.
One thing I learned is if you run the cap too far retarded the car starts poorly. Not a big deal unless you are in the staging lanes and have a crank trigger or 8973 fail. If the car will start on the mag trigger at least you can take the tree.
If this is all wrong it might explain why Duane is .3 quicker than me.

 

phase

I almost forgot...Turning the mag while it's running. ..we had a support bracket that was holding the mag still we thought...the mag started retarding while I was checking the timing and it was a rear mount chevy. The headers were blowing fire so high it was above the roof and my partner couldn't get inside to hit the kill switch. I pulled the fuel shutoff quick but anybody with a screw knows how long they run on accumulated fuel. By the time it quit it was blowing bright white fireworks into the air...I thought it burned some valves but we couldn't find any problems.
That was the first time we fired a screw engine.lol.

 

ok so we cut a big ole hole in a cap started it on the mag the phasing was spot on at 26 just coming into the post so we shut it off and changed it to the trigger and it wouldn't hit a lick ? the trigger is set at about 28 with 100 air gap and we use a 48 volt blower starter? we can move it around to get it to start but will it be right ?

 

8973

on your 8973 if your 1st dot is moved down (taking timing out)
you will have to turn power on and hit transbrake button to get the timing back up
to your base timing (example 26) if not it will run with what you have out on 1st dot
also last dot needs to be at your base timing (example 26)

alton if you have 8973 you may be doing this
if you set timing with out pushing button to reset you may have way too much timing when you do reset it

 

mike thanks for the tip ill try tonight, duane so you are sayin that when i start this thing and dont touch the brake button at all it has the 16 out already that i have programed in to take out when the brake is let off ? if this is correct it explains alot of crazy stuff !!