Misc: Ignition Rapide Distributor Modification

R

Rasputin

New Forum User
Non-VOC Member
Excuse my ignorance.
I have been re commissioning a Rapide that has a distributor modification. Looking at the points backplate I see the points placed at 180 deg apart.
The V twin is a 55 deg. Surely the points should be placed at 27.5 deg apart, or separated by 27.5 deg.
Originally a magneto, this uses one cam ring for both cylinders, is it a different magneto to say a BSA or Triumph?
Very puzzled.
 
Bill Thomas

Bill Thomas

Well Known and Active Forum User
VOC Member
Maybe a photo would help ?.

Many years ago I bought a Mag from a top Mag bloke In London,
At home my brother was turning it over in his hand and said,
This don't look right ?,
It was Triumph Cam Ring !.

I think the firing on a Vincent is 205 degrees and 155 ?.
Don't forget it's half engine speed ?.
 
Chris Launders

Chris Launders

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VOC Member
If it is using two sets of points they should be at 180 plus or minus 25 degrees, depends which you're looking at.
 
Bill Thomas

Bill Thomas

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VOC Member
Chris Launders said:
If it is using two sets of points they should be at 180 plus or minus 25 degrees, depends which you're looking at.
Click to expand...
What kind of cam does that use Chris ?,
Is it a wasted spark ?.
I tried to see what the Dolphin thing I once had ,
But the photo does not show end on.
 
Chris Launders

Chris Launders

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Bill Thomas said:
What kind of cam does that use Chris ?,
Is it a wasted spark ?.
I tried to see what the Dolphin thing I once had ,
But the photo does not show end on.
Click to expand...
It would just use a single cam, the two sets of points giving the correct timing, I have a single cam/twin sets of points set up on my Norvin (uses ATD rather than a distributer though) Also the same on one of my Harleys
 
Bill Thomas

Bill Thomas

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That's a strange way of putting it , 205 ---- 155 Degrees
But Half engine speed--------------102.5----77.5-- =25 degrees ????,

I thought my "D" Distributor was strange with a single 2 outlet Coil = Wasted Spark !.
My head hurts, Not good at this stuff !.

Back to School for me .
 
D

delboy

Well Known and Active Forum User
VOC Member
I used to have a "Jolly Thresher Garage" coil ignition set, that they used to sell. That used a Norton [I think?] baseplate and two sets of points. I THINK the points were opposite each other, but the cam was ground with the firing points and worked on the wasted spark principle. Mind you, that's all from faded memory.
BUT, it was 45-odd years ago!
Aaaargh! Really?
delboy
 
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