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Re: 25D4 vs. 45D4

To: "Dodd, Kelvin" <doddk@mossmotors.com>
Subject: Re: 25D4 vs. 45D4
From: Charles & Peggy Robinson <ccrobins@ktc.com>
Date: Mon, 17 Jul 2006 18:54:32 -0500
   Gee Kelvin,

   Is this the repro that Moss has for sale?  ;^)

    CR


Dodd, Kelvin wrote:
> Todd:
> 
> You remembered correctly. The 45D is technically superior to the 25D
> design, especially when fitted with points.  
> 
> 
> In general the cap and rotor re-design makes the unit less prone to
> carbon tracking making the unit more suitable for electronic ignition
> usage.  
> 
> The point sets and operating cam were upgraded giving longer life and
> better accuracy without the need for high spring pressure.  
> 
> 
> There were two different point sets available in the 45D unit. The
> earlier design had a red lifter block and was found originally in the
> Fed spec. 1975 only application. Later during the 80s the red point set
> was superseded by the blue self wiping points. These point sets are not
> interchangeable. Also if you are fitting a Pertronix unit, you do have
> to get the correct one to fit the installed point plate.  
> 
> 
> If the unit you received had no numbers on it, then it is probably the
> reproduction of the original Lucas 41427 unit. The repro units use the
> later blue type point sets and have the correct centrifugal and vacuum
> advances for the 1962-67 MGB application. It turns out this unit also
> works well with manifold vacuum although I would not have believed it
> until prompted to give it a try by Carl Heideman.  
> 
> 
> Kelvin.




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