[alfa2go]

I have a lovely NOS Magneti Marelli dizzy cap with the part number 105.32.05.011.02/03. This is a GTA part number. Will this cap fit my Montreal distributor? Just askin'...

 

[Montikai]

Maybe yes, but!; It will be cheaper you buy a new Montreal cap and store the original GTA cap. Because of the price for original GTA parts. You will get min. the the price twice from a new Montreal cap.

KEEP the GTA part!!!!!.

Kai

 

[alfa2go]

Maybe yes, but!; It will be cheaper you buy a new Montreal cap and store the original GTA cap. Because of the price for original GTA parts. You will get min. the the price twice from a new Montreal cap.

KEEP the GTA part!!!!!.

Kai

Yeah it wasn't cheap in the first place but I took the chance and bought it as I prefer original over repro. Seems it won't fit though according to what others tell me. I have heard stories there are varying levels of quality with the repro caps so is a bit of a lucky dip to get a good one.

And yes, it will be hard to let go as you don't find NOS GTA parts very often. Might be a nice expensive paperweight on my desk!:laugh2:

 

[Gordon Raymond]

The early GTA distributors have a larger diameter rotor mount shaft than some of the later Marelli GTA and GTA jr distributors. Caps do interchange. I have modified several Montreal rotors to work with my own GTA S119A Marelli distributors. The Montreal cap is not as robust as the old greenish GTA caps, but does work.
The value of having a real GTA cap on an S119A Marelli distributor on a real GTA engine, makes the Montreal cap better suited to a Montreal engine.
Yes, the original GTA caps are much more costly than Montreal caps, new or used.

 

[alfa2go]

Thanks Gordon, that's valuable information as always.

 

[Montikai]

The early GTA distributors have a larger diameter rotor mount shaft than some of the later Marelli GTA and GTA jr distributors. Caps do interchange. I have modified several Montreal rotors to work with my own GTA S119A Marelli distributors. The Montreal cap is not as robust as the old greenish GTA caps, but does work.
The value of having a real GTA cap on an S119A Marelli distributor on a real GTA engine, makes the Montreal cap better suited to a Montreal engine.
Yes, the original GTA caps are much more costly than Montreal caps, new or used.

Hi Gordon,
Your pictures are ..... great!! Nice Work. Good to see such a work.
Kai

 

[marcflorie]

Hello,
I know a GTA Magneti Marelli twin-spark distributor complete with rotor cap and rotor. As far as I could see, it was complete and original, although it had been used for racing on an NSU engine.
Can anyone tell me what it's worth? I would be very grateful, many thanks.

 

[marcflorie]

I finally got some pictures on the GTA Magneti Marelli twin-spark distributor.

Since I'm quite new on this site, I cannot posts URL's or pictures. So anyone who wants to see them, pleas let me know and I'll sent them to you.

Thanks in advance, kind regards,
Marc Florie

 

[Elvis100]

I think a Ferrari 308GTB cap fits? V8 Ferrari. I have one that's identical and new on my Montreal

 

[Gordon Raymond]

Monti cap, and some GTA jr caps interchange depending on the rotor shaft size. GTA does not, as originally they were all the large diameter rotor shaft size.
Over the production life of the 308 engines, there were some variations as well. Marelli did not make one distributor that was used on all these applicatios to my knowledge.

 

[larry]

The Caps and Rotors are different. The B circuits are totally different, the Montreal has a vertical brass contact ring for an air gap connection. The GTA uses a horizontal brass ring that a carbon button rides against.

Alfa Parts Exchange

 

[Gordon Raymond]

Thanks Larry. I'm often asked "which Ferrari distributor will ....?" I have a pair of original GTA units for my car, as well as assorted spare parts, and nothing directly interchanges with the small shaft Jr unit or the Ferrari assemblies.

 

[Alleggerita]

Gordon, I think you got shaft size backward. 119A is 8mm for 1600 GTA and 132A is 10mm for GTAjr if I remember correctly.

small shaft Jr unit

 

[Gordon Raymond]

You could be right. Wait a moment and I'll check one. Whoa! Thats neat, two in a pile in my bookcase!
And a GTA pump.
YOU ARE RIGHT! I'm wrong. Backwards. GTA is 8mm. Both of them.
Appreciate the correction. At least I remembered a big one and a small one!