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Re: Swapping out Strombergs for SUs

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Subject: Re: Swapping out Strombergs for SUs
From: "Charly Mitchel" <>
Date: Thu, 22 Dec 2005 07:37:05 -0800
If you have the early TR4 Z-S carbs and look at them they sit real tall in the
area between the throat and the top of the suction chamber.  They also have a
funny choke on them, a flap that rises up in front of the bridge and raises
the piston a little and also blocks the airflow at the same time.  If held
next to a TR6 Z-S, the look about 25% larger, even though they are 1 3/4".  I
believe they we used on the very early TR4's and were switched to SU's later.
The floats can be hard if not impossible to find.
TR6 #44
  ----- Original Message -----
  To: ; ; ;
  Sent: Thursday, December 22, 2005 7:17 AM
  Subject: Re: Swapping out Strombergs for SUs

  I think the early TR4/TR4A Z-S would be a candidate for conversion on the
TR6. I like their simplicity.

  What is a Tall Chamber Z-S, Charly?

  Thanks.  Joe (A)

    I ran Z-S last year for about half the races and I can only say I had
    of low end torque, but no top end.  I could hardly pull 6000 rpms.
    I was told the early Z-S off the TR4 work the best.  A fellow who has
    flowed all the British carbs told me he had the best results with the
    chambered Z-S.  I was tempted to try them on my car and never did.  I have
    set if someone is interested in them.
    TR6 #44

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