You can just as well perform the trial and error on the road.
According to my experience you will not see a dramatic change
regardless of what springs you use. The most important thing is that
you set the ignition at 4000 rpms to 35-360 advance. What happens
from idle to maximum revs with the advance curve does not seem to
make a major difference on the Healey engine. That much said I would
suggest that you try the medium tension first. Race cams prefer an
advance that comes on early in the rev range i.e. the soft spring.
Road cams prefer an advance that comes on late i.e. the strong spring.
Good luck
Magnus Karlsson
Sweden
7 mar 2006 kl. 18.13 skrev Simon Lachlan:
> These are the 2 little springs in the distributor that are part of the
> advance/retard mechanism.
> These things are no longer available as straight off the shelf
> parts. I was
> advised (thank you list) that Denis Welch has them. They sell a set
> of three
> pairs..stronger, normal, weaker.
> I spoke to them regarding which set to fit to my slightly tuned BT7
> MkII.
> These are my notes
> QUOTE :-According to Jeremy Welch @ Denis Welch, regarding their
> selling
> distributor "bob weight springs" in packs of 3:-
> Strong pair retards more
> Medium/normal pair is standard
> Weak pair advances sooner.
> He suggests the Medium pair for my car with its DWelch "Fast Road"
> cam as
> the start point, otherwise trial & error on a "rolling road". Hoho!!
> -:UNQUOTE
|