091 coil configuration for 63

[Michael G.]

After searching the archives, etc., it appears that original 091 coils all had studs that were silver-colored zinc plated and were threaded to the end. All the repros I've seen seem to have "pilot' points on the studs (a pilot point looks like someone shaved of the first few threads) and some are yellow chromate.

I'm guessing that the repro manufacturers copied an original, so does anyone know if some originals also had yellow chromate and/or pilot points?

Thanks

[Mike M.]

Re: 091 coil configuration for 63

original studs aren't pointed like the repos and the studs in the repos are stainless. i believe, although not 100% sure, that the plating on the washers were silver cad.mike

[Michael G.]

Re: 091 coil configuration for 63

Thanks Mike, you taught me that they weren't stainless a couple weeks ago (at Wildwood), but my repro coil also had the pilot point studs. I had to make sure of what I was looking for during my search for a real 091. They're not easy to find...

[Philip C.]

Re: 091 coil configuration for 63

Hi Mike G also the "091" is on lower part of the coil on orig ones as far as I know. Phil 8063

[Dave S.]

Re: 091 coil configuration for 63

Hi Mike G also the "091" is on lower part of the coil on orig ones as far as I know. Phil 8063

Michael,
There has been much discussion on this and the archives contains lots of quality data on 091 coil details and configuration.
Rather than try to resopnd here I would suggest you check there first.

[Ken A.]

Re: 091 coil configuration for 63

Per the prints I have seen as well as the original coils I've looked at, all coils used a "silver stud" that had a dogpoint to facilitate assembly.

[John F.]

Re: 091 coil configuration for 63

This is the 091 coil on my 62. Hope these pictures help.
John

[John D.]

Re: 091 coil configuration for 63

I have an original 091 that has two variations on the studs. One stud is has a dog point and the other stud does not. Doesn't appear the coil has been messed with.
The NOS 091 on my 63 has two matching dogpoints. JD

P.S. I bet there are some that don't know just what a dog point stud is.
It's a stud that has the first few threads missing. That are is just smoooth. Length of the dog points can vary according the specifications.

[Michael G.]

Re: 091 coil configuration for 63

Thanks guys,

John, It appears you have irrefutable evidence that both types of stud came on 091 coils, unless someone cut off the dog point on one of your studs (can't imagine why anyone would do that, but Bubba has done stranger things).

Allright, now I know many of the coils had no dog point studs, yet some did. And they mixed and matched them, apparently at will. From the archives, we also have "12V" on the top, or bottom, as an acceptable iteration.

We also know the repops have stainless studs. Why stainless? I have no clue; stainless studs are way more expensive than zinc-plated plain carbon steel. Why would they bother?

Has anyone seen one in pink? (just kidding)

[Ken A.]

Re: 091 coil configuration for 63

Thanks guys,

John, It appears you have irrefutable evidence that both types of stud came on 091 coils, unless someone cut off the dog point on one of your studs (can't imagine why anyone would do that, but Bubba has done stranger things). One coil is not "irrefutable", I wouldn't think.

Allright, now I know many of the coils had no dog point studs, yet some did. And they mixed and matched them, apparently at will. From the archives, we also have "12V" on the top, or bottom, as an acceptable iteration.

We also know the repops have stainless studs. Why stainless? I have no clue; stainless studs are way more expensive than zinc-plated plain carbon steel. Why would they bother?

Has anyone seen one in pink? (just kidding)

Yes, that's an Oldsmobile coil.

[John D.]

Re: 091 coil configuration for 63

Michael etal, Variations in the top of the 091's also. Meanwhile there has been a NOS 091 on ebay on numerous occasions for 995.00. JD

[Michael G.]

Re: 091 coil configuration for 63

Ken, that 'irrefutable' was a bit tongue in cheek. I think we'd be hard pressed to find any 48 year old part that we could say for sure had not been messed with a bit, even those on low mileage 'original' cars

John, I think they maybe had multiple tools for the 091, so all these variations are probably mostly real.

In any case, I'd like to put an original 091 on my car, but if coils are going for a grand a pop, this hobby is quickly getting too expensive....

[Edward J.]

Re: 091 coil configuration for 63

Mike, my 63 /091 coil has the silver studs. and have decided that because of the costs to replace, I have removed and will use only for judging reasons only.

[Ken A.]

Re: 091 coil configuration for 63

Ken, that 'irrefutable' was a bit tongue in cheek. I think we'd be hard pressed to find any 48 year old part that we could say for sure had not been messed with a bit, even those on low mileage 'original' cars

John, I think they maybe had multiple tools for the 091, so all these variations are probably mostly real.

In any case, I'd like to put an original 091 on my car, but if coils are going for a grand a pop, this hobby is quickly getting too expensive....

Anybody that would pay more than a dollar for a 50 year old used part is nuts, also applies to used spark plugs & old points sets.

[Calvin M.]

Re: 091 coil configuration for 63

The 091 from my '57 also has fully threaded, silver studs.

Cal