There are four springs in the set of which only one is a 'secondary' spring.
All the springs tend towards the heavy end of what has been seen in genuine
MGB distributors so far, not surprising since CM are a tuning specialists
and therefore the springs are probably selected for use at higher rpms.
Yes, they physically fit the 25D and 45D but the important question is "what
curve do they give?" - there are some 16 or so specs for the MGB alone, some
with very different characteristics. A number of us are in the process of
obtaining springs from various sources and measuring physical and dynamic
characteristics to see if we can come up with some suitable combinations.
PaulH.
----- Original Message -----
From: R. O. Lindsay <rolindsay@dgrc.com>
Cc: MG List <mgs@autox.team.net>
Sent: Monday, January 22, 2001 8:13 PM
Subject: 25D4 advance parts found
> Hi Gang,
> Concluding the thread on distributor centrifugal advance
> springs, I received these two notes from Cambridge Motor
> Sports in England. I include them here with permission.
>
> > We can supply a set of springs CMT1180 which will do
> > any Lucas distributor. Don't ask us which ones to use <as>
> > there is no guidance from Lucas. Its really a question of
> > trial and error. The kit contains enough springs to provide
> > 3 or 4 combinations which is enough to sort out most cars.
> > CMT1180 costs #7.17 per set. Best regards, Jon Savage
>
> and...
>
> > Rick,
> > You can ring us on +44 1767 677969. Ask for Jon or Michael.
> > Best regards, Jon Savage
>
> There, Gang, is our source for Lucas 25D4 springs.
>
> Rick Lindsay
> Diamond Geoscience Research
> 5727 S. Lewis Ave., Tulsa, OK
> Voice: +1 918-747-3456
> Fax: +1 918-747-8599
|