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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>There is a fall rate test in the SU Manual to check the piston against the dash pot. As Kees stated, they are matched.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>John<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> Healeys [mailto:healeys-bounces@autox.team.net] <b>On Behalf Of </b>simon.lachlan@alexarevel.plus.com<br><b>Sent:</b> Sunday, October 6, 2019 10:33 AM<br><b>To:</b> 'Healeys' <healeys@autox.team.net><br><b>Subject:</b> [Healeys] SU Dashpot puzzle<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-GB>Here’s one for the technoctats:-<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>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.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>So, I swapped the offending two and that gave me three HD6s, all with one shoulder.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>Car started on the choke, same as normal. Seemingly!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>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.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>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.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>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. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>Adjusted down quarter of a turn and all seems well.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>Questions:- beyond the obvious – ie that changing dashpots does make a difference after all – what is going on? Why was there a change?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>(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).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>Any ideas?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>Simon<o:p></o:p></span></p></div></body></html>