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Electronic Ignition Conversion - Factory Datsun "matchbox"

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I'll wait. Wish you had a comparison of the matchbox spark. Damn.... these units are everywhere in the wrecking yards.

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I'll wait. Wish you had a comparison of the matchbox spark. Damn.... these units are everywhere in the wrecking yards.

if i had the coil to wire up i would do the matchbox setup, ideally the remote electronic dizzy would be better.  instead of having to gut a ignition module to wire it.  Yeah the prw-2 ignition module and gm coil are easy to get a hold of

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Skip the module and connect directly to the Red and the Green coil wires.

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When comparing, or checking for spark in open air, you need to use a much larger gap, like cutting the ground electrode completely off the test plug.

The reason is because it takes a much stonger spark to jump (for refference) .040" under compression, than it does in open air.

The rule of thumb I have always went by is a minimum of .250" gap in open air.

On some really high compression applications, that needs to be even greater, or the engine will cut out durring full load with a standard plug gap.

The only way to get around that is to close the gap on the plug, or get a hotter ignition.

 

I campained a 125cc flat track bike in the mid '70s that had a 19:1 compression ratio.

The only way I could get it to run cleanly through the rpm range was to run a .016" plug gap.

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Skip the module and connect directly to the Red and the Green coil wires.

the prw-2 ignition module does wire into the red and green wire, just used the old module to gut to run wiring through

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Installing Matchbox distributor on 1974 l18 I have the pedestal for both engines l20 and l18 and I have distributor for both 18 and the 20 so far the best I can get is needing to cut a slot out of the timing on the back or use a big washer to hold the distributor down someone said take out the oil pump drive shaft but I don't want to turn that around and get it messed up so it won't run so I'm just I'm just getting the distributor so It'll point at number one any help would be greatly appreciated and do I need the ballast resistor with the Accel super coil? sorry for my so many stupid questions

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All you need is to get the engine at TDC and the rotor under ANY spark plug wire above it on the cap. Doesn't matter which one because this will become the #1 plug and all you do is move all the other wires into the 1342 (counter clockwise) firing order.

 

Now if you can't get this adjustment, or you are at the far end of the adjustment and can't quite get it, the easiest thing to do is unbolt the distributor from the timing cover and lift it out. Look down inside at the top of the drive spindle and note it's position. Grip the spindle with needle nose pliers and hold onto it while someone drops the oil pump out of the way. Two people should be able to lower the spindle enough to disengage it from the crankshaft and turn it one tooth in the direction you want the rotor to be turned. Push it back up into place and hold with the pliers. Install the oil pump with one bolt for now. You may have to twist the oil pump as it engages the spindle. Drop the distributor loosely back in place and check that the rotor does indeed now point directly under one of the plug wires on the cap. If not keep trying. If it is good, put the other oil pump bolts in and tighten them and bolt the distributor in. 

 

Expect to spill a couple of tablespoonfuls of oil when the pump is removed. Have rags handy. 

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Is it the SUPER COIL BIG yellow one?  they come with a .85 ohm ballast resisitor in the box.

 

Me ? yes I would use the stock ballast resisitor. as I don't think it wants a full14volts while running. otherwise buy a 79 Datsun coilor a MSD Blaster 2 coil and don't use anyballast resisitor.

 

PS there were 2 matchbox distributors one will fit the base mount and one will be like 60degs off.

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22 hours ago, 620Bisbee said:

 and do I need the ballast resistor with the Accel super coil? sorry for my so many stupid questions

 

There are no stupid questions only being stupid for not asking them. ..... ok there have been a few really stupid questions but you are a long way from it.

 

 

Throw the Accel 'super' coil away or sell it. If the primary coil resistance is 0.8 - 1.0 ohms you can take a chance but don't blame me if it blows up. Get a coil from any Datsun after '77 like a '79 200sx. It rated between 0.8 and 1.0 resistance and is perfect and made for the EI matchbox distributor. If you have a 'points' coil you have to run a ballast resistor or it will draw too much current through it and burn out. Also you won't get the higher output available with an EI coil.

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