You could take it to a shop with a dizzy machine and plot the curve,
including the vac unit; then compare it to the 25D4 that you have
already. Hope you haven't wasted your $$.
Cheers,
CR
Todd Mullins wrote:
> Well, um, here's the other interesting part of this story: There are no
> numbers on it anywhere.
>
> Weird, huh? No numbers on the body. No numbers on the vacuum
> canister. I took it all apart, looking for any identifying markings on
> the advance mechanism, and found none there either.
>
> So the truth is, I really don't know what I've got, other than a
> brand-new 45D4 shipped from England...
>
> -todd
>
> On Jul 15, 2006, at 5:59 PM, Charles & Peggy Robinson wrote:
>
>> Go to http://www.mgb-stuff.org.uk/curvestext.htm and look up your
>> dizzy by serial #. Hopefully you got one with a curve that will be OK
>> for your engine. BTW, I use a 25D4 #40897 in my '69 B. Still using
>> points and a Lucas Sport coil.
>>
>> Cheers,
>>
>> CR
>>
>>
>> Todd Mullins wrote:
>>> Hi all,
>>> I've been slowly gathering parts for my '74 MGB reassembly. My
>>> emphasis is on optimizing functionality and performance, rather than
>>> a historically correct restoration.
>> SNIP
>>> So I put it to you: Is the points-equipped 45D4 superior to the
>>> points-equipped 25D4? I know that electronic ignition levels the
>>> playing field here (and I'll probably buy a Pertronix for the 45D4),
>>> but I'm interested in your opinions of the intrinsic strengths and
>>> weaknesses of the two distributors in their original form.
>>> As always, thanks for all of your informed opinions!
>>> -todd
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