Jump to content


Photo

Coil options


  • Please log in to reply
14 replies to this topic

#1 Matteo08

Matteo08

    Newbie

  • New Members
  • Pip
  • 2 posts
  • Location:Beaverton Oregon
  • Cars:1973 Datsun 620

Posted 13 November 2017 - 06:35 PM

Does anyone know of a good option for an aftermarket Coil and Distributor for a '74 620?

#2 datzenmike

datzenmike

    KING RAT

  • User Administrator
  • 69,424 posts
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 13 November 2017 - 07:12 PM

Stick with the factory equipment. The '79 and '80 L20B came with a EI (electronic ignition) pointless AKA 'matchbox' distributor and matched coil with higher output. Never have to replace your points or gap them again.

 

Not a fan of aftermarket coils. They are like fishing lures... they catch more fishermen than fish. It's no mistake that they are painted bright red or yellow colors.

 

You're in the PNW which is full of Datsuns. Check out the wrecking yards and back yards for one. Or a want ad here... http://community.rat...sort_order=desc  ... There is a handy like at the top of every page under the RATSUN.NET logo


Posted Image

#3 racerx

racerx

    Senior Member

  • Senior Member
  • PipPipPipPipPip
  • 4,116 posts
  • Location:NorCal
  • Cars:71 Datsun 510 and 65 Mustang Fastback

Posted 13 November 2017 - 07:33 PM

Anything wrong with your distributor and coil?

#4 flatcat19

flatcat19

    Back in Black

  • Senior Member
  • PipPipPipPipPipPipPipPipPipPip
  • 19,739 posts
  • Location:Tri-Cities, WA/PDX
  • Cars:Smaller. Better. Slower. Lower.

Posted 13 November 2017 - 07:40 PM

This conversation could have all taken place in the other thread you just started.



http://community.rat...have-a-project/

You can't hang if your nuts haven't dropped...it's physics


#5 banzai510(hainz)

banzai510(hainz)

    L motor God

  • Senior Member
  • PipPipPipPipPipPipPipPipPipPip
  • 14,983 posts

Posted 14 November 2017 - 06:42 AM

Simple if you keep your Points distributor Keep the point coil!!!!!!!otherwise things can go bad by putting the wrong resisitance coil in there

Key is befriend a Datsun guy that knows what hes doing


Throw on some Weber sidedrafts, Rising Sun hood.... call it good

#6 datzenmike

datzenmike

    KING RAT

  • User Administrator
  • 69,424 posts
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 14 November 2017 - 07:26 AM

Correct. Hotter spark is from higher current flow from lower resistance coils. Don't get taken by wild claims by the maker. This buggers up the points faster.  EI distributor has the lower impedance coil and can handle it.

 

In truth you will never notice the difference, maybe faster starting. Better idle. The best reason is to get rid of the maintenance when running points.


Posted Image

#7 distributorguy

distributorguy

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,069 posts
  • Location:Metropolis, MN
  • Cars:77 Datsun 620, 73 Datsun 620

Posted 14 November 2017 - 09:45 AM

In Datsuns: points  need 3 Ohm coils like stock or Bosch Blue (its what I run in the race truck at Bonneville).  

Electronics need a 1.5 Ohm coil.  

Aftermarket electronics need a 3 Ohm coil in almost all cases, but refer to the instructions for specific info.  



#8 datzenmike

datzenmike

    KING RAT

  • User Administrator
  • 69,424 posts
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 14 November 2017 - 10:01 AM

3 ohms total. I think the points coils are 1.5 in series with a 1.5 ballast resistor. During start the ballast is by passed for a brief hotter spark.

 

EI coils are 0.8 to 1.0 ohms

 

You can use a points coil if you also use the ballast resister, but then you don't get the full time higher voltage spark.


Posted Image

#9 racerx

racerx

    Senior Member

  • Senior Member
  • PipPipPipPipPip
  • 4,116 posts
  • Location:NorCal
  • Cars:71 Datsun 510 and 65 Mustang Fastback

Posted 14 November 2017 - 10:48 AM

Yep...I have pertronix w 1.5 ohm coil. It seems to idle smoother and don't have points.

#10 distributorguy

distributorguy

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,069 posts
  • Location:Metropolis, MN
  • Cars:77 Datsun 620, 73 Datsun 620

Posted 15 November 2017 - 12:32 PM

Funny - my stock 1980 Datsun 720 coil was 1.5 Ohms on a truck with 1200 miles that was never registered for road use.  

 

With points you will get a better quality spark by eliminating all the extra connections of having 12V at startup and a ballasted 10V at Run.  Just run it all direct with a 3 Ohm Bosch coil.  Proven effective at over 10,000 rpms!  



#11 datzenmike

datzenmike

    KING RAT

  • User Administrator
  • 69,424 posts
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 15 November 2017 - 12:57 PM

The '80 720 used the EI system and it should be 0.8 to 1 ohm. The EI was also used on the 280zx which red lines at 7,600 rpm which would be 11,400 RPM on a 4 cylinder.

 

Spark 'intensity' of a coil, is a function of how much current flows through the coil to produce a magnetic field around it. In a points set up, 12 volts through a 3 ohm coil is 4.0 amps. (8 amps through a 1.5 ohm coil) In an EI set up 12 volts through a 1.0 ohm coil is 12 amps. In theory 3X more but in practice somewhat less but certainly a lot more than a points spark. The EI has a current limiting circuit to prevent damage.  


Posted Image

#12 flatcat19

flatcat19

    Back in Black

  • Senior Member
  • PipPipPipPipPipPipPipPipPipPip
  • 19,739 posts
  • Location:Tri-Cities, WA/PDX
  • Cars:Smaller. Better. Slower. Lower.

Posted 15 November 2017 - 01:56 PM

Why hasn't distributorguy offered up his services to the Ratsun population yet?


Post a classified ad, yo. Or a "how-to" explaining why recurves should be done, etc.


I've got a matchbox I'd love you to once-over before I install it.

You can't hang if your nuts haven't dropped...it's physics


#13 datzenmike

datzenmike

    KING RAT

  • User Administrator
  • 69,424 posts
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 15 November 2017 - 02:17 PM

I think you really need a distributor machine and oscilloscope. Variable vacuum supply. I know my advance works because I can see it move.... but does it really work?

 

Advance is all about reducing pollution and increasing economy. If you throw away the pollution side then this leaves economy and performance, which would seem to go hand in hand. A well running engine should be both efficient and powerful. If you are getting the most out of your gas at part throttle then you should be getting good mileage also


Posted Image

#14 distributorguy

distributorguy

    Senior Member

  • Senior Member
  • PipPipPipPip
  • 1,069 posts
  • Location:Metropolis, MN
  • Cars:77 Datsun 620, 73 Datsun 620

Posted 15 November 2017 - 02:17 PM

I don't like using forums as a place to pitch sales.  Its for sharing info.  

Anyone who wants can look me up -  http://advanceddistributors.com



#15 flatcat19

flatcat19

    Back in Black

  • Senior Member
  • PipPipPipPipPipPipPipPipPipPip
  • 19,739 posts
  • Location:Tri-Cities, WA/PDX
  • Cars:Smaller. Better. Slower. Lower.

Posted 15 November 2017 - 02:41 PM

I don't like using forums as a place to pitch sales.  Its for sharing info.  
Anyone who wants can look me up -  http://advanceddistributors.com


That's all I needed to see.

You can't hang if your nuts haven't dropped...it's physics