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Re: [Mgs] SU damper springs

Subject: Re: [Mgs] SU damper springs
From: Bob Howard <>
Date: Fri, 11 Apr 2008 09:35:52 -0400
Hi Paul,
  Thanks for the Burlen site.  When tried this morning, the page would
not open, so I will try again later.
  Numerous articles on the rebuilding of our HS and HIS carbs refer to
the springs losing their strength over time and the difficulty of
identifying springs from which the painted identification has washed off.
   Des Hammill, in his How To Build and Power Tune SU Carbs, shows one
testing springs on a postal scale, but for the compressed height at which
one does the testing he refers to page 158 of the SU Reference Catalogue.
  Someone else implied that the test height is that of the spring
compressed at rest when assembled in the carb.  If that implied height is
a correct height at which to measure on the scale, but that one reference
is the only I have seen. 
  Hammill's book says that most 1.5 inch SUs use a type A, red 4.5 oz
spring, while the HIF 1.5 inch use a type B spring, red 4.5 oz.  He then
goes on to discuss different needles and springs best suited for
modifications of the engine. 

On Fri, 11 Apr 2008 09:22:03 +0100 "Paul Hunt"
<> writes:
> Have you tried Google?  This came up for me 2nd in the list of 
> returns 
>  The red 
> spring  seems to have been used in all MGBs, i.e. 4.5oz at 2.635in.
> PaulH.
> ----- Original Message ----- 
> >  Where can I find the height at which the damper piston springs 
> are measured, other than in the SU Reference Catalogue that I do not 
> own?
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