distributor number

thob

thob

Member
Hi,

where would I find the exact dizzy number. I want to fit a Pertronix kit and there seem to be 3 different kits depending on the dizzy number. These are the kits
1.) Clockwise rotation with vacuum advance: LU-181
2.) Clockwise rotation with vacuum retard: LU-183
3.) Counter clockwise rotation with vac ret: LU-185

Now all I need is the corresponding number. Any idea how to figure it out?

Thanks Thomas
PS. I also wonder if I should get Magnecor leads or Pertronix' own
 
Hello Thomas,

The original Lucas distributor fitted into the P6B was a type 35D8. There were a number of slight variations of that type which allowed for changes in the total mechanical advance offered and the rate of advance. On the side of your distributor (you will need a bright light and a small mirror probably to assist) you will see a five digit number. Note down the number. Vacuum advance was the only option with the modules offered for our engines. Vacuum retard was never used.

Magnecor leads are excellent, having used them since circa 1988.

Ron.
 
I was looking already but couldn't see anything. Will get a mirror and cover the unseen parts :wink: - so it's most likely a Pertronix LU-181

Cheers
Thomas
 
Hi Thomas,

It's highly unlikely you'll have CCW rotation.

Did you pick up your info from the >Retro Rockets site?<

If not, half way down the page there are pictures of the 2 types of points baseplate on the 35D8, leading you to either the LU-181 or LU-183 Ignitor.

If you need any tech help, email carl dudash [retrorockets@snet.net] - he's a helpful guy! :)

Cheers,
 
SydneyRoverP6B said:
Magnecor leads are excellent, having used them since circa 1988.

Ron.
Click to expand...

Which ones are you using? again I found 2 parts numbers resulting in different coil lead.
MGN8002 - SD1 1976-86
MGN8007 - Range Rover V8 1970-86

Thomas
 
vaultsman said:
Hi Thomas,

Did you pick up your info from the >Retro Rockets site?<

If not, half way down the page there are pictures of the 2 types of points baseplate on the 35D8, leading you to either the LU-181 or LU-183 Ignitor.

Cheers,
Click to expand...

No I talked to a guy at Pertronix.

Here's a pic of my dizzy
 

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Thob wrote,..
Which ones are you using? again I found 2 parts numbers resulting in different coil lead.
MGN8002 - SD1 1976-86
MGN8007 - Range Rover V8 1970-86
Click to expand...

Hello Thomas,

Neither of those, although either will work.

The difference is in the lengths. Magnecor cut them to the original Lucas design, the correct rubber boots on the right leads, and the lengths are correct so they look right and not like a bird's nest.

They make the correct leads for the 3500/3500S.

Ron.
 
thob wrote,..
Hi Ron,

you got a parts number because I can't find one on their list
Click to expand...

Hello Thomas,

Unfortunately I don't have a part number. I go to the factory where they make them here in Sydney, let them know what I am after, they look up the specs and I wait while they make them for me.

I purchased my first set in 1988, and the second set in 2007 just before the installation of my new 4.6 litre engine,...I just wanted new leads for a new engine.. 8)

Ron.
 
SydneyRoverP6B said:
Hello Thomas,

The original Lucas distributor fitted into the P6B was a type 35D8. There were a number of slight variations of that type which allowed for changes in the total mechanical advance offered and the rate of advance. On the side of your distributor (you will need a bright light and a small mirror probably to assist) you will see a five digit number. Note down the number. Vacuum advance was the only option with the modules offered for our engines. Vacuum retard was never used.
Ron.
Click to expand...

Found my dizzy number - thanks again for the guidance.
41393A <-
Lucas 35D8 17 73

Anything of interest with it?

Thomas
 
Brian-Northampton said:
Your Distributor was manufactured in the 17th week (abt end May) 1973
Model 35D8
Clockwise Rotation
Used between 1969 and 1974
Morgan Plus Eight, 1969-74 Rover 3500 auto and 3500 S manual and 3.5 litre

The vacuum code is "5/6/5 (y)" but I don't know what that means.

Details found here: http://www.starchak.ca/tech/pdfs/lucas.pdf
Click to expand...

When I spoke with Martin at >Distributor Doctor< he did say there were one or two errors on that starchak pdf. The "5/6/5" listed signifies the vac starts to operate at 5" Hg, finishes at 6" Hg, and yields 5 degrees of advance. This sets alarm bells ringing as no vac canister can be that sensitive to operate accurately over a range of just 1" Hg.

My dizzy is also a 41393A. Thomas, if you look at the cranked mounting leg on the vac, you'll see the correct spec engraved on it. The numbers should be 5 16 5 & 54424749 (the latter number being the Lucas reference).

The diaphragm on my vac had perished...if you suck hard on the pipe connection the points baseplate should pull anti-clockwise if the diaphragm's OK. Generally after 30-odd years they're perished.

New vacuum canisters from Distributor Doctor were GBP 29.50 + VAT in April this year.

Cheers,
 
as you kinda predicted. after fitting the Pertronix/Magnecor remedy I figured out that the vacumm unit perished. Sent a mail to the DizzyDoc already

Cheers Thomas
 
Hmm, I got a reply from the Distributor Doctor saying that he has one that is slightly different from my spec

It should be 5-16-5, he has a 5-17-8.

What do you think? Is this an issue?

Cheers Thomas
 
Thob wrote,..
It should be 5-16-5, he has a 5-17-8
Click to expand...

Hello Thomas,

Both begin operating with 5" Hg whilst your original finishes at 16" Hg and sees 10 degrees of advancement at the crankshaft, whilst the other finishes at 17" Hg and sees 16 degrees of advancment at the crankshaft.

Personally I don't see any detriment in using the replacement as the additional 6 degrees of advancement can only assist in further improving your engine's fuel economy. The 5-17-8 was the standard on some of the distributors fitted to P6Bs and today the only Lucas OEM vacuum module available for Rover V8 engines has those same boundary values.

Ron.
 
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