[Healeys] SU Carburettors (was: Pre-ignition)

[Bob Spidell <bspidell@comcast.net>]

Yup.  Our BN2 had mis-matched dampers, and the carb pistons wouldn't rise and 
fall in sync.  I managed to cobble two 
with the same characteristics together from some spare carbs.

The small, brass 'pistons' on the end vary.  They function as check valves, 
allowing the pistons to fall quickly and 
rise slower (upward movement closes the 'valves,' and downward movement opens 
them).  They are rather intricately cast 
and/or machined--another testament to the sophistication and refinement of SU 
carbs.

Bob


On 6/4/2013 5:54 PM, David Porter wrote:
> For the record: Some SU's are vented internally and some through the cap.
> Also for the record. Not all dampers are the same, either in rate of flow
> back or even in diameter. They are not mix and match at your whim. Same goes
> for the piston springs.
> Dave
>
> frogeye@porterscustom.com
>
> Porter Customs   2909 Arno NE
> Albuquerque, NM USA 87107
> 505-352-1378
> 1954 BN2  1959 AN5
> Porter Custom Bicycles
>
> gallery:
> http://picasaweb.google.com/porterscustombicycles/PorterCustomBicyclesStuff
>
> GO HERE: http://porterbikes.com/  nice pictures-fun facts-my world
>
>

-- 
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Bob Spidell           San Jose, CA            bspidell@comcast.net

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