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#21 Ken_B

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Posted 14 February 2011 - 08:16 PM

Sweet truck, nice to see another light blue 521

Should you buy it? Clear it with your wife. No wife? You're asking a stupid question then..

.

#22 skyblue

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Posted 14 February 2011 - 08:28 PM

Have you replaced the points? They could be worn out. Check the wires to the ballast resister and the coil for looseness. Wiggle them while it's running to see if it cuts out.


previous owner replaced the points with some E.I. never seen before. I usually use pertronix, and it works great.
39889260914_4988868e4f_b.jpg

is the ballast resister the white thing under the coil?
39705216115_95d78c96e5_b.jpg



#23 skyblue

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Posted 14 February 2011 - 08:31 PM

Damm i miss my 521 now :D
You have a clean & straight truck!
I had my 521 dropped 5-6 inches. I re-keyed the torsions & ran 3 inch blocks & ran 2 leafs. You'll want to "C" notch the frame unless you dont mind the frame hitting the axle :rolleyes:


you got any old pics? would love to see it.

When you say "re-keyed" is that the same as re-indexing? how was the ride?

#24 skyblue

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Posted 14 February 2011 - 08:32 PM

Sweet truck, nice to see another light blue 521


thanks. yours is one of my faves.

#25 wayno

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Posted 14 February 2011 - 09:14 PM

That is a stock matchbox electronic ign. from late 70s and early 80s datsun.

 

 


#26 skyblue

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Posted 14 February 2011 - 10:02 PM

That is a stock matchbox electronic ign. from late 70s and early 80s datsun.


are they pretty reliable? or should i change it out for something more modern?

#27 Pacific coast Datsun

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Posted 14 February 2011 - 10:20 PM

you got any old pics? would love to see it.

When you say "re-keyed" is that the same as re-indexing? how was the ride?

Yeah re-index'd...same difference :D The matchbox distributor is very reliable, run it & enjoy. Heres my old 521.....
Posted Image
would've sat lower up front but the shock were bottomed out. That being said it rode kinda rough but it didnt bother me.
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Posted Image

#28 skyblue

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Posted 14 February 2011 - 11:19 PM

sweet. that stance is just what i'm looking for. i like it. did you have to notch the frame?

#29 skyblue

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Posted 14 February 2011 - 11:39 PM

is the ballast resister the white thing under the coil?
Posted Image


and should it be hooked up?

#30 Pacific coast Datsun

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Posted 15 February 2011 - 08:34 AM

I didnt notch the frame but it needed to be done. I removed the HUGE #8 bump stops & the frame hit the axle sometimes. You could get some 720 or Hardbody bumpstops & cut them down & run those.They fit under the U bolts & are a lower profile. It may still ride kinda rough at times without a notch though.
With the correct coil [bigger than stock & may say "for use on electronic ignition" on it] the ballast does NOT need to be hooked up.
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#31 banzai510(hainz)

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Posted 15 February 2011 - 09:32 AM

Bluesky

Those matchbox ignitions are good.

what might be happening is if that is the stock point coil it could be getting HOT as Point coils are design to run on low current.
Try a s coil from a 79 200sx or 79 620, 80 720 these are designed to run on straight 12volts.


if this is the point coil you could rehook up the wires back to stock. and wire the matchbox like a Pertronix. Put red on the Blk wht wire which is the POWER . stock it would be at the ballasst resisitor.olddatsuns.com has the wiring drawgs there for a 521

to make this EZer just get the 79 coil and you dont need to worry about hooking it back up to stockbut ne I bet coil is getting hot feel it
Throw on some Weber sidedrafts, Rising Sun hood.... call it good

#32 skyblue

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Posted 15 February 2011 - 06:53 PM

Bluesky

Those matchbox ignitions are good.

what might be happening is if that is the stock point coil it could be getting HOT as Point coils are design to run on low current.
Try a s coil from a 79 200sx or 79 620, 80 720 these are designed to run on straight 12volts.


if this is the point coil you could rehook up the wires back to stock. and wire the matchbox like a Pertronix. Put red on the Blk wht wire which is the POWER . stock it would be at the ballasst resisitor.olddatsuns.com has the wiring drawgs there for a 521

to make this EZer just get the 79 coil and you dont need to worry about hooking it back up to stockbut ne I bet coil is getting hot feel it


on my way home it died like 6 times on me on the freeway. to make things worse there's a huge rainstorm going on right now too. but anyway, i pulled the coil wire from the cap, cranked it to check for spark and nothing. then it came back, then gone. it would come and go intermittently. soo frustrating. didn't feel it but what you said makes sense cause it starts acting up after ive been driving for half an hour. eventually (barely) made it home. i will get a new coil as soon as i can.

thanks for the help guys. i'll keep you posted.

#33 skyblue

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Posted 15 February 2011 - 07:21 PM

would a Pertronix Flame Thrower coil be enough?

#34 Pacific coast Datsun

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Posted 15 February 2011 - 10:02 PM

Id park it until you can find a better coil.
Not sure if the Flamethrower coil would work but you can also grab one off a 280 Z or ZX. The Z-ZX coil will be taller & wider that a points coil.
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#35 skyblue

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Posted 15 February 2011 - 10:27 PM

so do i just go to a parts store and ask for the suggested coil?

#36 Pacific coast Datsun

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Posted 15 February 2011 - 11:17 PM

Hit up the junkyards to find a ZX coil. Maybe an Accel coil will work but may be pricey.
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#37 DatDoug

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Posted 15 February 2011 - 11:36 PM

Its the wrong coil. Go to the parts store & get a new stock coil for a 79 620. It will hook rite up & u can toss that ballast resistor. Awesome truck by the way. Like Hainz said buff that paint out with TR3. It looks way better lowered :cool: 521's can be static dropped pretty low without c-notching & bags. Try that first & find some cool rims. You will likey :D
Stance is everything

#38 skyblue

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Posted 16 February 2011 - 12:07 AM

great. i will do that first thing tomorrow. thanks soo much for the help everyone.:D

#39 banzai510(hainz)

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Posted 16 February 2011 - 06:57 AM

a MSD Blaster 2 coil will work also about 35$-40$. I think they have more bling than spark to a Actual Jap made Black coil. but the stock type one might be alot cheaper.

let us know

hard to keep track of all these post as they are all over this site.
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#40 72RaceReady

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Posted 18 February 2011 - 06:29 PM

hey guys i am new to this site as well and everyone is super cool i have always wanted a 510 and now finally picked one up a 2 door 71 with an l20 and that matchbox ignition but its starting to fail too now just like yours skyblue

its cutting out and sputtering like its not firing on all cyl it had an accel super coil on there from the previous owner kinda over kill lol but anyways i got in it the other day and it wouldnt fire finally i tapped the coil and the matchbox and finally started i drove it to work at oreillys and i baught a cap and rotor cuz they were fried and i baught an msd blaster 2 coil and now its still acting up worst than before is it the matchbox going out? or what could it be it runs like doodoo and it only gets better when i get on the throttle at high rps i looked one of the ignition module and its almost 200 bucks that my cost and damn i would rather just pick up an msd and by pass the matchbox if i could. can you? thanks for all your help you guys are the best