Help me ID this Distributer - AKA Pertronix doesn't fit

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EricG

EricG

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Tried to install my Pertronix Ignitor II (Model 91665A) electronic ignition today, but the adapter plate doesn't line up to anything - not even close. So I'm guessing I got the wrong model. Anybody know the right one? I'm told it's a 1975 2F, I suspect it might be from an FJ55.

I'm also wondering what that part is that I've circled in red in the 2nd picture.

If I take off that red circled thingamabob, I may be able to drill new holes in the adapter plate to make it fit. Might even be able to re-mount the thingamabob on top of the adapter plate. If I can get it mounted, is there any reason this shouldn't work?
Thanks!
Dizzy1.webp
Dizzy2.webp
Dizzy3.webp
 
And finally - is my vacuum hooked up correctly?
Dizzy4.webp
 
EricG

Looks identical the one out of my 1976 2F
The little bracket you have pictured is a damper as far as I know, puts a little resistance on the cam to smooth out the advance/retard movement.
The vacuum is hooked up right at the distributor, you have to have it on the right port on the carb. The vacuum pot is actually for retarding the ignition on this distributor.

Thanks jb
 
that pertronix kit you listed is for the early-74 distributor and as posted your distributor is from a later model. It does appear to be a 75/76 model year distributor...

there is a pertronix kit that fits that distributor, but since its a hybrid application no one seems to be forthcoming with the info on what exactly works...

I will tell you from personal experience that you can find parts to convert that distributor to electronic pickup with OEM toyota parts from a 5mge work fine. even the vacuum advance canister with some minor mods will work.
 
It is a 75-mid 76 USA vac retard dissy. There should be no vac hose connected to it. Just run it as a mechanical advance only.

Mark A has the 2 parts needed to make the pertronix fit. Do not try to make the early pertronix fit this later dissy. It just becomes a mess, then when the dissy ends up here someday I will curse you.
 
FJ40Jim said:
It is a 75-mid 76 USA vac retard dissy. There should be no vac hose connected to it. Just run it as a mechanical advance only.
Click to expand...

Could this explain why it runs rough and doesn't take the throttle well when it's hot? Carb was just rebuilt by Marks Offroad.

Mark A has the 2 parts needed to make the pertronix fit. Do not try to make the early pertronix fit this later dissy.
Click to expand...

Ok, I'll give him a call and see what he can do for me.

It just becomes a mess, then when the dissy ends up here someday I will curse you.
Click to expand...

Lol - yea, I've had some words for some previous owners recently as well. There ought to be a hippocratic oath for working on these "First, do no harm."
 
EricG said:
Could this explain why it runs rough and doesn't take the throttle well when it's hot? Carb was just rebuilt by Marks Offroad.
Click to expand...

Yes. The vac advance serves to immediately advance the timing when the throttle is cracked open, helping the engine to accelerate. If vac retard is connected to the ported vac fitting, then the exact opposite effect is observed. The moment the throttle is cracked, the engine goes gutless.
 
Splangy said:
Wanna give me a deal on that pertronix kit since you can't use it?!
Click to expand...

Lol - the vultures circling already!
Maybe - let me see what works out of this whole escapade.
 
FJ40Jim said:
Yes. The vac advance serves to immediately advance the timing when the throttle is cracked open, helping the engine to accelerate. If vac retard is connected to the ported vac fitting, then the exact opposite effect is observed. The moment the throttle is cracked, the engine goes gutless.
Click to expand...

Ok ... so why is it called a vac retard dizzy if you're not supposed to connect the vac retard port to vacuum? And there is another port on the other side of the diaphram thing - should vacuum be run to that instead? Or just cap all the vacuum ports and call it good?!

Not doubting you, just confused!

And FWIW, the gutless behavior only seems to occur when the engine gets hot.
 
EricG said:
Ok ... so why is it called a vac retard dizzy
Click to expand...

Because the application of vacuum causes the timing to retard.

if you're not supposed to connect the vac retard port to vacuum?
Click to expand...

USA dissys from 1969 and newer are never connected to the engine directly. They get vacuum at various times through BVSV's, computer controlled valves, delay valves, check valves, etc.

there is another port on the other side of the diaphram thing - should vacuum be run to that instead?
Click to expand...

As a matter of fact, yes. The advance can is a later vac retard and advance that has been swapped into a 75-76 dissy. There is a yellow cap barely visible in one pic that is the vacuum advance fitting. That can be connected to a ported vacuum source. It would be a good idea to test the vac advancer to see if it works. It is likely that it is dead (a leaker).

And FWIW, the gutless behavior only seems to occur when the engine gets hot.
Click to expand...
Probably not spark related then.
 
Ok, thanks for the info - very interesting!
 
kiwidog said:
The little bracket you have pictured is a damper as far as I know, puts a little resistance on the cam to smooth out the advance/retard movement.
Click to expand...

Any idea what the consequences are for leaving that damper out? I believe I can make the adapter plate work, but that damper won't work regardless due to the magnet collar that goes over the shaft.
 
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