The most difficult part pr rebuilding SU carbs is replacing the throttle shafts.
Many people choose to go with oversized shafts. While it is easier to oversize
the channels for oversized shafts, it hurts your
performance to do so. THis is because there is more metal in the way of
air/fuel getting into the engine.
The best way to do it is to drill and rebush the channels and use standard size
shafts. But make sure that the holes are align bored
so that the shafts do not bind.
Joe
"alemen@pop.ftconnect.com" wrote:
>
> Tim, I just brought back (to the US) a pair of used HS4 plus rebuild kit
>needles etc. which I got from Sports Car Supplies (they are near Newcastle). I
>see Rimmer also sells the kits over in the UK.
>
> The kit contains lots of parts (including throttle spindles and main jets).
>Note that there is a service kit and a rebuild kit.
> I rebuilt the current US spec Stromberg on my car and that was pretty easy. I
>expect the SU's to be similar, just that their's two to do.
>
> I also had revs dying off. I replaced my old Allsion with a Pertronix.
> Did the VTR autocross and could hit the red line all the time!
>
> Alan
>
> Original Message:
> -----------------
> From: T. .R. Dafforn td214@cam.ac.uk
> Date: Fri, 25 Aug 2000 14:18:42 +0100
> Subject: Which carbs
>
> Hi every one...
> Have been enjoying the late afternoon sun here in england in the car!
> But have some niggles which although I don't plan to sort out until the
> winter I would like to start thinking about.
> Firstly my dual HS4 SU are knackered, 150K miles of abuses have taken
> there toll.
> So I was wondering.
> 1)Should I rebuild them (including new jet bearings to fix the sticking
> jets and new bushes to fix the throttle spindle air leaks.)?
> 2)Should I pay someone who knows what they are doing to rebuild them
> (150 Pounds +)?
> 3)Should I shell out for new ones (300 pounds+)?
> 4)should I switch to a single Webber (? pounds) but lower maintainance?
> 5)Should I switch to dual weber (increased overdraft)?
>
> Also the power of my stock 1500 seems to die at 4000 revs, Is this
> normal, or is this another sign of a worn carb and or distrubtor. I
> thought I might install an Aldon Ignitor exlectronic system anyway!
> Thanks for the help
> the summer has been too short!
> Cheers
> Tim
>
> --
> Tim Dafforn
> Structural Medicine
> Department of Haematology
> CIMR
> University of Cambridge
> Wellcome-MRC Building (Level6)
> Hills Road
> Cambridge
> CB2 2XY
>
> Tel. (01223) 336829
> Fax. (01223) 336827
> http://smokeroom.cimr.cam.ac.uk/
>
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