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914World.com _ 914World Garage _ Ignition wiring
Posted by: Cfletch Jun 8 2015, 10:37 PM
Looking for a Ignition CM for my 1974 2.7l engine. I see the MSD 6201 Digital 6A on pelican and I am wondering if i'll run into any issues with that, and also what else would I need?
Posted by: matthepcat Jun 9 2015, 12:03 AM
You can run an old Bosh CDI with a basic coil. Runs my 70 2.2s well.
Posted by: Mark Henry Jun 9 2015, 06:06 AM
MSD 6AL now has a rev limiter built in, no more pills.
You may also need a MSD tach adaptor.
Get the MSD high vibration coil if mounting on engine, the cheaper MSD blaster coil can only be used if mounting on the firewall right side up.
Stock CDI also works just as good, but last I checked a good used unit is up around MSD prices.
Posted by: MJHanna Jun 9 2015, 06:34 AM
Also look at the MSD streetfire.
http://www.msdperformance.com/streetfire/cdiignition.html
They are smaller boxes than the MSD, have rev contol via a rotary dials to adjust the rev limiter in 100 rpm increments and also has a handy diagnostic LED.
They are around $150 you can pull the label off and they look sortof like a black bosch cd box. I know of two local engines running them in a twin plug configuration. 
Posted by: Cfletch Jun 9 2015, 08:36 AM
I think I'll go with that unit I mentioned. Do you have the coil part number? And with the cd and the new coil I should be ok as far as ignition correct?
Posted by: MJHanna Jun 9 2015, 09:37 AM
I think I'll go with that unit I mentioned. Do you have the coil part number? And with the cd and the new coil I should be ok as far as ignition correct?
Why? Why would you not want to take advantage of having a soft rev limiter?
Just wait until you over shift and are replacing values and doing a top end on your 2.7. you might wished bought one that had that feature.
You can have issues with the sparkplug wires, and as mentioned you could have issues with the tach working correctly if you use a VDO. Posted by: Cfletch Jun 9 2015, 10:06 AM
I think I'll go with that unit I mentioned. Do you have the coil part number? And with the cd and the new coil I should be ok as far as ignition correct?
Why? Why would you not want to take advantage of having a soft rev limiter?
Just wait until you over shift and are replacing values and doing a top end on your 2.7. you might wished bought one that had that feature.
You can have issues with the sparkplug wires, and as mentioned you could have issues with the tach working correctly if you use a VDO.Because according to Mark the model mentioned has a limiter.
Posted by: Mark Henry Jun 9 2015, 11:17 AM
Because according to Mark the model mentioned has a limiter.
You said MSD 6201 Digital 6A, I said MSD 6AL which is model #6425.
Model 6201 I don't see a mention of a rev limiter.
Why? Why would you not want to take advantage of having a soft rev limiter?
Just wait until you over shift and are replacing values and doing a top end on your 2.7. you might wished bought one that had that feature.
In a real bad missed shift a rev limiter is NOT going to save you, as that is a mechanical over rev.
In the same vane you should never use a rev limiter as a shift indicator. I don't care if they call it a "soft" limiter you are still loading and unloading the engine at high RPM.
A rev limiter is a safety device, but never think it's fool proof.
Posted by: sixnotfour Jun 9 2015, 11:34 AM
MSD Digital 6A and 6AL Ignition Control
6A - PN 6201, 6AL - PN 6425
Posted by: MJHanna Jun 9 2015, 12:41 PM
Because according to Mark the model mentioned has a limiter.
You said MSD 6201 Digital 6A, I said MSD 6AL which is model #6425.
Model 6201 I don't see a mention of a rev limiter.
Why? Why would you not want to take advantage of having a soft rev limiter?
Just wait until you over shift and are replacing values and doing a top end on your 2.7. you might wished bought one that had that feature.
In a real bad missed shift a rev limiter is NOT going to save you, as that is a mechanical over rev.
In the same vane you should never use a rev limiter as a shift indicator. I don't care if they call it a "soft" limiter you are still loading and unloading the engine at high RPM.
A rev limiter is a safety device, but never think it's fool proof.
Agreed. but is better than nothing
Posted by: Cfletch Jun 9 2015, 01:36 PM
Because according to Mark the model mentioned has a limiter.
You said MSD 6201 Digital 6A, I said MSD 6AL which is model #6425.
Model 6201 I don't see a mention of a rev limiter.
Why? Why would you not want to take advantage of having a soft rev limiter?
Just wait until you over shift and are replacing values and doing a top end on your 2.7. you might wished bought one that had that feature.
In a real bad missed shift a rev limiter is NOT going to save you, as that is a mechanical over rev.
In the same vane you should never use a rev limiter as a shift indicator. I don't care if they call it a "soft" limiter you are still loading and unloading the engine at high RPM.
A rev limiter is a safety device, but never think it's fool proof.
Oh ok my mistake. So with the 6al and that shock proof coil I should be complete? Still running a vdo gauge
Posted by: screenguy914 Jun 9 2015, 07:15 PM
I think it's as important to ditch the factory breaker points and replace it with a breakerless system (e.g. Crane, Pertronix, etc.). They should be compatible with other manufacturer's equipment across the board.
Sherwood
Posted by: Cfletch Jun 9 2015, 08:37 PM
I think it's as important to ditch the factory breaker points and replace it with a breakerless system (e.g. Crane, Pertronix, etc.). They should be compatible with other manufacturer's equipment across the board.
Sherwood
there are two different kinds of pertronix ones. Ill go to Ignitor 2 since my distributor # is 0-231-184-001
Posted by: Cfletch Jun 11 2015, 09:04 PM
So I got my parts today, Im running the MSD 6AL with the shock resistant coil and I also bought the Pertronix electronic ignition unit that gets rid of the points in the distributor.
I came across this photo thats been on the forum before reguarding a wiring diagram on how to hook it all up and my question is; Is this accurate? I dont have the tach adapter and have seen some need it and others don't so im not sure if i really need it just yet. (VDO gauge) The instructions for the Pertronix unit is showing me to connect the wires to the coil and then the MSD is also telling me to send some wires to the coil, this is where my confusion is.
Here is the photo: http://www.914world.com/bbs2/uploads_offsite/i176.photobucket.com-2573-1372376693.1.jpg
Posted by: Mark Henry Jun 12 2015, 09:04 AM
The diagram is correct, the pertronix coil wires now go into the MSD box as shown, only the MSD wires go to the coil.
Tach wire plugs directly into the tach output on the MSD, if it doesn't work then you have to buy MSD 8920 and wire it as in your drawing.
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