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Re: [Healeys] HS4 Tri-carb tuning

To: healeys@autox.team.net
Subject: Re: [Healeys] HS4 Tri-carb tuning
From: Bob Spidell <bspidell@comcast.net>
Date: Mon, 6 Jul 2020 18:32:21 -0700
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <00bb01d653e6$4a8e46b0$dfaad410$.ref@sbcglobal.net> <00bb01d653e6$4a8e46b0$dfaad410$@sbcglobal.net>
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After much effort and consideration, I decided there must be some Brits 
who wrote that 'procedure' laughing their asses off knowing there is no 
practical* way to lift the pistons exactly 1/32"

* But you can, if you have the little wire thingies in the poor man's 
tuning kit--actually quite useful--stick the wire thingies in the piston 
and gauge the piston rise; the wires themselves are pretty close to 
1/32" thick


On 7/6/2020 3:39 PM, John Spaur via Healeys wrote:
>
> I installed three brand new HS4 carbs on my BT7 this weekend. They 
> seem to work really well with no load and light load on some very 
> short test drives. The jet adjusting nuts are very close to what the 
> old ones were set to. One of the tests is to lift the piston with the 
> lifting pin as far as you can. That is supposed to stall the engine. 
> However, this only works on the center carb. When I test the front and 
> rear, it just slows the engine down a bit. What have others found when 
> they do this test? BTW, I can hardly tell a difference in the engine 
> speed when I lift the pistons 1/32?.
>
> TIA,
>
> John
>
> San Jose, CA
>
>


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    After much effort and consideration, I decided there must be some
    Brits who wrote that 'procedure' laughing their asses off knowing
    there is no practical* way to lift the pistons exactly 1/32"<br>
    <br>
    * But you can, if you have the little wire thingies in the poor
    man's tuning kit--actually quite useful--stick the wire thingies in
    the piston and gauge the piston rise; the wires themselves are
    pretty close to 1/32" thick<br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 7/6/2020 3:39 PM, John Spaur via
      Healeys wrote:<br>
    </div>
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      <div class="WordSection1">
        <p class="MsoNormal">I installed three brand new HS4 carbs on my
          BT7 this weekend. They seem to work really well with no load
          and light load on some very short test drives. The jet
          adjusting nuts are very close to what the old ones were set
          to. One of the tests is to lift the piston with the lifting
          pin as far as you can. That is supposed to stall the engine.
          However, this only works on the center carb. When I test the
          front and rear, it just slows the engine down a bit. What have
          others found when they do this test? BTW, I can hardly tell a
          difference in the engine speed when I lift the pistons 
1/32?.<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">TIA,<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">John<o:p></o:p></p>
        <p class="MsoNormal">San Jose, CA <o:p></o:p></p>
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