Jump to content

620 EI Dist with 2 vacuum advances


Recommended Posts

Ok stupid question. I put a D4K distributor in my 73 620 with the stock stock L16 and it runs good but not 100%. Problem is I have no idea if I have the advances hooked up right. I hear one is for advance and one is retard and one takes ported vacuum and the other manifold and shit I dunno which is which. And as good as it runs it's not quite right. Any help would be MUCH appreciated thanks...

Link to comment
  • Replies 21
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Two vacuum advances??? No such thing. No Datsun distributor ever had a vacuum 'retard'. The DK4 distributors are for an L20B engine. Look on the body of the distributor for the part number it will start with 22100-????? This number will identify what it came out of.

Link to comment

Banzai... the 280zx turbo engines use a special EI dizzy with a module with two extra wires on the side. Obviously the six cylinder dizzy won't work on a 4 cylinder engine but someone might swap the module.  It needs the EFI's ECU to work out the advance/Retard. If this module is used on a 4 cylinder the timing will retard up to 10 degrees as the revs go up. 

 

As the OP mentions this is a 620 (L4) and ported and manifold vacuum I had to assume it wasn't a 280zx dizzy OR the turbo 12-93 module. I also asked him to get the part number off the side so we can see if single, dual points or one of the two EI dizzys.

Link to comment

The timing is actually past the marks where it runs best. I probably have an advance issue. Or retard issue depending how you look at it..I'll disconnect both and see how it does and where it ends up at timing wise. I'll try and post a picture from the home computer this evening.

Link to comment

This is correct. I just took my 79 620 to a carb specialist and I was having all kinds of problems and come to find out , I waas just slightly off on my timing and my distributor placement. a quick 170.00 and now I smoke em in 2nd gear from the take off. I have a 5 speed and never use first gear. It really does pay to have someone whose trade and educated do this work.

Link to comment

The timing is actually past the marks where it runs best. I probably have an advance issue. Or retard issue depending how you look at it..I'll disconnect both and see how it does and where it ends up at timing wise. I'll try and post a picture from the home computer this evening.

 

There should only be one vacuum advance hose from distributor to the carb. This needs pictures.  

Link to comment

That distributor, 22100-H9701, IS for an '80 A series engine and should have the matchbox on the side and a drive gear on the bottom but the vacuum advance on it is for the '81 E15S front wheel drive E series engine that is driven from the cam on the back of the head and does not have a drive gear on it.

 

The correct vacuum advance for an '80 A series engine is...

22301-H9501 or 22301-H9801

 

The dual one you have is....

22301-21M00 or 22301-23M00 (vacuum control assy)

 

This has likely been rebuilt and the wrong vacuum advance installed.

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.