[Healeys] SU Dashpot puzzle

Kees Oudesluijs coudesluijs at chello.nl
Sun Oct 6 11:42:17 MDT 2019


Did you keep the pistons with the dashpots. They are matched.

Kees Oudesluijs



Op 6-10-2019 om 19:32 schreef simon.lachlan at alexarevel.plus.com:
>
> Here’s one for the technoctats:-
>
> You may have noticed my posts about swapping from two-shouldered to 
> single-shouldered dashpots. I did it because having two of one and one 
> of the other was irritating, not because I thought there’d be any changes.
>
> So, I swapped the offending two and that gave me three HD6s, all with 
> one shoulder.
>
> Car started on the choke, same as normal. Seemingly!
>
> However, doing the garden hose in one ear trick revealed that the rear 
> carb, always single shouldered, was making less intake hiss than the 
> other recently added pair. Easily rectified.
>
> I took the car out this afternoon. Started fine and ran well. But, if 
> I eased off, the revs dropped and the engine cut out. Also, there was 
> quite a lot of popping and f**ting on the overrun.
>
> So, on my return, I gave the front two carbs about half a turn up on 
> the slow idle screws. This, quite small adjustment really, seemed to 
> cure it and even to raise the idle rather higher than I like.
>
> Adjusted down quarter of a turn and all seems well.
>
> Questions:- beyond the obvious – ie that changing dashpots does make a 
> difference after all – what is going on? Why was there a change?
>
> (Plainly, I swapped needles and springs when I swapped dashpots so 
> I’ve got all the same in the carbs….the ones that I had all along).
>
> Any ideas?
>
> Simon
>
>
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