Crank Trigger

Posted By: SD800

Crank Trigger - 05/18/11 02:40 AM

Guys,
Just installed a crank trigger on the 572 in my challenger.
We set initial timing at 34 degrees advanced and fired it up.it idles at 1100 rpm at 34 degrees but when you whack the throttle the timing will retard by 10 degrees.
I know there is some loss of timing with the timing chain and gears between the distributor gear but I never realized it wAs this much.
Is this normal with a crank trigger and is there a way to compensate for this?

Posted By: '72CudaRacer

Re: Crank Trigger - 05/18/11 02:43 AM

I have a gear drive on mine, but the timing is rock steady. Is your distrib locked?

Brian Dunnigan

Posted By: FastmOp

Re: Crank Trigger - 05/18/11 02:53 AM

The dizzy needs welded solid. Make sure to phase the rotor to the cap at the time the crank trigger is making contact.

Posted By: SD800

Re: Crank Trigger - 05/18/11 02:53 AM

Yes the distributor is locked out

Posted By: Bigcube

Re: Crank Trigger - 05/18/11 02:59 AM

Not sure what that is, should be rock solid, no movement at all. One thing to try is the polarity could be wrong on the pickup. That will usually cause it it be off because of a leading edge/trailing edge thing but it still should not move

Posted By: plycuda

Re: Crank Trigger - 05/18/11 02:59 AM

shouldn't move unless you have some kind of retard set up on a timming computer. the distributor not locked won't change the timming just the rotor phasing.

Posted By: SD800

Re: Crank Trigger - 05/18/11 03:00 AM

Quote:

The dizzy needs welded solid. Make sure to phase the rotor to the cap at the time the crank trigger is making contact.

we did phase the distributor the best we could,would turning the distributor to better phase it reduce or fix this?

Posted By: Al_Alguire

Re: Crank Trigger - 05/18/11 03:01 AM

What is the rest of the ignition system?

Posted By: SD800

Re: Crank Trigger - 05/18/11 03:08 AM

Does it matter which way the wheel is installed,in order for the wheel to center on the balancer we had to install the wheel with the rotation arrow against the balancer

Posted By: SD800

Re: Crank Trigger - 05/18/11 03:14 AM

Quote:

What is the rest of the ignition system?

MSD 6AL box and MSD distributor moroso crank trigger

Posted By: FastmOp

Re: Crank Trigger - 05/18/11 03:25 AM

What's the gap?

Good call on timing not moving with dizzy unlocked. I was tired

I'm a little confused on this one now with the parts u listed. You should be up and running. Try to swap the wheel. It's got an arrow for a reason I guess.

Posted By: SD800

Re: Crank Trigger - 05/18/11 03:36 AM

Gap is set at .050

Posted By: Al_Alguire

Re: Crank Trigger - 05/18/11 03:39 AM

Does the timing stabilize at a higher RPM?

Posted By: SD800

Re: Crank Trigger - 05/18/11 03:58 AM

Quote:

Does the timing stabilize at a higher RPM?

Al,
I did not bring it to a high rpm to see what it does,I would increase the rpm to about 2000 rmp and the timing would smooth out at 34 degrees but if you whacked the throttle, maybe 4000 rmp it will retard by 10 degrees on the hit.

Posted By: MoparBilly

Re: Crank Trigger - 05/18/11 06:18 AM

What brand timing light??
Borrow another light, and hook it to a battery not running the car, and confirm reading.

Attached picture 6638904-IMAGE0006.JPG

Posted By: slantman

Re: Crank Trigger - 05/18/11 06:20 AM

Quote:

Does it matter which way the wheel is installed,in order for the wheel to center on the balancer we had to install the wheel with the rotation arrow against the balancer

I'm pretty sure the rotation arrow has to be facing out, away from the balancer. Otherwise the polarity of the flying magnets is the wrong way round. The engine will still run, but not make power as it revs up.

Posted By: Al_Alguire

Re: Crank Trigger - 05/18/11 06:22 AM

What Billy said is an excellent point. Before panic sets in might be a good idea to "get a second opinion".

Cant think of any logical reason to see what you are seeing. is the Moroso pickup wire shielded? Is the pickup wiring running near anything else electrical, particularly the water pump? Sometimes you can get some unwanted RF that will cause all sorts of crazy things to happen.

I missed the part about the arrow. Would definitely want it installed correctly with rotation. I assume they put them that way for a reason?

Posted By: EchoSixMike

Re: Crank Trigger - 05/18/11 09:14 AM

Arrow MUST face out, that's the most likely cause of your error.

http://www.youtube.com/watch?v=TCHEHPESf60

Fast forward to 6:00 mark and it explains the issue. S/F....Ken M

Posted By: SD800

Re: Crank Trigger - 05/18/11 01:40 PM

Sounds like that may be my issue.

Thanks for the help guys

Posted By: dvw

Re: Crank Trigger - 05/18/11 07:28 PM

While your at it check all 4 magnets. All four should either repel or attract. If not the offending magnet(s) can affect that cylinders pick-up.
Doug