Large cap distributor & Weber

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mydogpea

mydogpea

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Is anybody running this set-up on a 2f? Engine is desmogged but I'm not exactly sure on how to route the vacuum lines from distributor to carb.
Not sure which ports should be capped and which should be vented to atmosphere on the distributor.
The engine is an '87 2f going into a '72 fj40.
Any advice and/or pictures would be very helpful.
Thank you in advance.
 
same setup, albeit in a 60.
2Fcc.webp
 
Where did you route these 2 vacuum hoses to? Also, did you connect anything to the 2 open ports on the top of the distributor cap? If so, where did you route them to?
2Fcc.webp
 
with the large cap dizzy both vacuum ports on the side provide advancement, but when de-smoged only hook up the outer port (furthest away from dizzy)

the inner port provides too much advancement without an EGR to cool off cylinder temps, so just cap it off

as far as the cap ventilation there should be one line to a breather on the fire wall ( at least on a 40 there is ) and the other should go to the air cleaner to provide a cross flow the keep the dizzy dry.

hope this helps!!
 
91 4runner said:
with the large cap dizzy both vacuum ports on the side provide advancement, but when de-smoged only hook up the outer port (furthest away from dizzy)

the inner port provides too much advancement without an EGR to cool off cylinder temps, so just cap it off

as far as the cap ventilation there should be one line to a breather on the fire wall ( at least on a 40 there is ) and the other should go to the air cleaner to provide a cross flow the keep the dizzy dry.

hope this helps!!
Click to expand...
This helps alot. I still have a couple questions though.
What do I hook up the outer port of the dizzy to, the carb?
Breather on the firewall? What does it look like?
I won't be using the original air cleaner, so I might have to leave the larger port on the top of the cap open to atmosphere, since there's nowhere on the weber air cleaner to route it to.

Thank you for your help.
 
While I'm not an expert, I have a similar set up, did a fair amount of research here on Mud, and offer these suggestions (as well as a link to a thread I started and some helpful responses).

Here is the link:

https://forum.ih8mud.com/40-55-series-tech/612302-big-cap-dizzy-install-1-5f.html

My understanding is that the outer port on the distributor vacuum advance provides additional vacuum advance for high altitude locations. The inner port is the main vacuum port and should be connected to the vacuum port on the bottom of your Weber carb. I've never heard or experienced that it provides too much advance without an EGR set up, but I suppose that's possible.

As far as the two distributor cap vents, on a '72 there will be no place to route lines. You can either rig up a breather lines or just leave them open to provide some venting.
 
GregRay said:
While I'm not an expert, I have a similar set up, did a fair amount of research here on Mud, and offer these suggestions (as well as a link to a thread I started and some helpful responses).

Here is the link:

https://forum.ih8mud.com/40-55-series-tech/612302-big-cap-dizzy-install-1-5f.html

My understanding is that the outer port on the distributor vacuum advance provides additional vacuum advance for high altitude locations. The inner port is the main vacuum port and should be connected to the vacuum port on the bottom of your Weber carb. I've never heard or experienced that it provides too much advance without an EGR set up, but I suppose that's possible.

As far as the two distributor cap vents, on a '72 there will be no place to route lines. You can either rig up a breather lines or just leave them open to provide some venting.
Click to expand...
Thank you for the link, this helps a great deal.
 
The distributor vacuum advance hose should originate at the ported vac port on the carb. To verify that it is a ported vac source, connect a vac gauge and start the engine. It should show zero or close to it at hot (slow) idle, and strong vacuum above idle.

On an 81-87 2F, it is usually best to connect to the secondary vacuum fitting (furthest from dissy body). The later engine has a completely different head & chamber. The higher CR and smaller chamber means quicker burn time, so less advance is needed.

On a 72 body, there is no firewall vent filter for dissy cap breather. Use a disposable clear plastic fuel filter mounted up high on the firewall instead. Connect it to the large breather port on the dissy cap.

The smaller breather port should be connected to the air cleaner. Procure a barbed bulkhead fitting the same size as the fitting on the cap. Install into bottom of aircleaner.

This type of fitting:
ec06d37f0ee1091a632363e8468eb31c.jpg


Hopefully this makes it all clear.
 
Oh this makes great sense now. Thank you FJ40Jim!

I won't be able to determine which is the vac port on the carb until I have the engine installed and running.

So now that I think I have that part figured out, next step is learning how to wire up the distributor since the '72 wiring is way different...fun stuff.
 
One wire

It's a one wire connection. Apply +12V ignition power to the wire that goes to the +coil terminal and then into the ignitor. It grounds through the mount, so be sure the mounting feet are clean metal and antiseez'ed.
 
FJ40Jim said:
It's a one wire connection. Apply +12V ignition power to the wire that goes to the +coil terminal and then into the ignitor. It grounds through the mount, so be sure the mounting feet are clean metal and antiseez'ed.
Click to expand...
I don't have an igniter. All I have is a coil with an internal resistor.
The distributor has a 2 blade connector, 1 blade is a red wire, the other is a white wire.
Can I run a wire from the + terminal on the coil to the red wire blade, and another from the - terminal to the white wire blade on the distributor?
Is this basically the same or am I way off? I appologize, wiring is my nemesis.
 
mydogpea said:
I don't have an igniter. All I have is a coil with an internal resistor.
The distributor has a 2 blade connector, 1 blade is a red wire, the other is a white wire.
Can I run a wire from the + terminal on the coil to the red wire blade, and another from the - terminal to the white wire blade on the distributor?
Is this basically the same or am I way off? I appologize, wiring is my nemesis.
Click to expand...

ok if ur using the "large cap" dizzy from a fj60 you will need the ignitor and coil out of a fj60 to run it, then wire it up like jim said
 
91 4runner said:
ok if ur using the "large cap" dizzy from a fj60 you will need the ignitor and coil out of a fj60 to run it, then wire it up like jim said
Click to expand...
If I get just the ignitor, can I use the coil that I have now with the ignitor?
 
mydogpea said:
If I get just the ignitor, can I use the coil that I have now with the ignitor?
Click to expand...

yes it should be fine, but most ive seen for sale come as a "set"
 
duffontap said:
Can't help with the tech, but it looks like you're gearing up for a major drive train upgrade. Sounds like those fj60 2f's are the bee's knees. We'll have to drag race when you're done, lol.
Click to expand...

sorry for the chat but, duffontap r u in oregon?
 
mydogpea said:
If I get just the ignitor, can I use the coil that I have now with the ignitor?
Click to expand...
Theoretically, yes, any coil will work.

But there is a different part number for the coil used with full electronic ignition, so I would go with that for maximum reliability.
 
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