[TR] zenith or su's ?

[Wayne Lee]

Hi Jim,
    HS4's are a different story and in 1980 the MGB had a single Stromberg 
175.
HS6's would have been a good move. My old 69 GT6+ had 95 HP. My old Volvo
1966 Volvo P1800S put out 115 with 1800 cc's. and the twin SU's.
The old Volvo's are the #1 donor of old SU's for old Brit Sports Cars.
Cheers,
Wayne
64 TR4 (Future Project)
75 TR6 (Daily Driver till next week)





--------------------------------------------------
From: <jimmuller at rcn.com>
Sent: Tuesday, December 01, 2009 5:35 PM
To: <Triumphs at autox.team.net>
Subject: Re: [TR] zenith or su's ?

> Wayne Lee wrote:
>> HS6's should be fine for improved performance over the ZS's
>> in a GT6.
>
> Well one would think so.  Unfortunately (as I wrote before, and note it 
> wasn't my car which originated this discussion) the PO who did my 
> conversion used HS4's from an MGB (which was 1800cc, no?).  Even further, 
> from the serial numbers it appears they were 1980 and so would have been 
> calibrated to idle lean and with full emissions controls in place.  The 
> typical response, which is what I did, would be to question mixture and 
> then if that didn't answer spend the money on needles after consulting Joe 
> Curto.  It didn't answer, and eventually after much time and attempted 
> tuning had elapsed another call to Joe Curto revealed that the proper 
> springs HS4 for a TR 2000cc engine was yellow.  I ended up sending some 
> extra needles to Randall but I don't think I ever investigated whehther 
> the original needle swap had even been necessary.  But if anyone, Joe 
> Curto included, had suggested to me earlier on that the springs are a 
> swappable item too it would have save me a bit of money and a
>  !
> mort of trouble.  Until then I had had no call to think about the 
> question.
>
>> I know Jim meant he needed Yellow springs not Needles,
>
> Isn't Yellow Springs some place far away from here?  Needles too, I think.
> --
> Jim Muller
>
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