Hi Mike,
Sophie has her overrun valves soldered up, and as you saw a few months ago,
there seems to be little change in her speed. I have to say that I have not run
a spit with the valves working, so I have nothing to compare with.
However I had a look through my trusty SU manual and they only mention that the
valves are solely there for improved economy.
One thing I would say though is that it is probably better to replace the
butterfly with new ones without the valve (they are not that expensive), and the
valve does a good job of blocking airflow at full throttle. It is also easier to
replace the butterflies rather than trying to solder them in situ.
BTW thanks for the invitation for Saturday, can't manage it unfortunately due to
having a load of people coming for lunch, which is a bugger, as there are a load
of things I need from the parts bin. So I can see I will have to make a run
before long! Still on for the Duxford day though...
Cheers
Tim
PS Richard. Very best of luck in Scotland, and if I were you I would fill the
windscreen surround you are getting from TRGB with as much Waxoil as it will
take. They rust out bloody quickly.
Michael Hargreave Mawson wrote:
> In article <"020EA3B810AF601A*/c=us/admd= /prmd=Cat/o=NOTES/s=Gosling/g
> =Richard/i=B/"@MHS>, Richard B Gosling <Gosling_Richard_B@perkins.com>
> writes
> >Donald and Mike,
> >
> >UK late engines did have this over-run valve. I soldered mine closed. You
> > could do the job properly and buy new butterfly valve discs that don't have
> > the valve in in the first place, if you care.
>
> Thanks for clearing that up. Now, the big question - given that Triumph
> felt these things were necessary and beneficial, clearly they had some
> purpose. What functionality do I lose if I solder them up?
>
> ATB
> --
> Mike
> Michael Hargreave Mawson, author of "Eyewitness in the Crimea"
> http://www.greenhillbooks.com/booksheets/eyewitness_in_the_crimea.html
>
--
Tim Dafforn
University of Cambridge
Structural Medicine Unit
Cambridge Institute for Medical Research
Wellcome Trust Centre for Molecular Mechanisms of Disease
Hills Rd, Cambridge CB2 2XY.
UK
Tel. (01223) 763230
Fax. (01223) 336827
http://smokeroom.cimr.cam.ac.uk/
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