Tuning SU Carbs

[Leeds Sprint]

Hello All<br>
<br>
Some of you don't need any advice. But I found this handy web link that has clued me in a bit more about the opperation and tuning of SU carbs. Maybe it might be handy for some of you.<br>
<br>
<!--EZCODE LINK START--><a href="http://www.mintylamb.co.uk/?page=sutune.htm" target="top">www.mintylamb.co.uk/?page=sutune.htm</a><!--EZCODE LINK END--><br>
<br>
Chris

<p></p><i>Edited by: <A HREF=http://p206.ezboard.com/bthetriumphdolo ... omiteuk</A> at: 26/10/06 4:42 pm<br></i>

[Jon Tilson]

an amateur...a nice one, but still an amatuer.<br>
Very nice of him to do that but a couple of critical points...<br>
I do it at 1000rpm. this is necessary on dollies and Sprints and TR7's cos of the longer inlet tract. The piston should not be raised by more than 1/32 inch on the lift and the ammount of change is no more than 50-100 rpm in 1000...it only lasts a second when its right.<br>
The sweet spot is about 3 flats wide. You frequently need to rev the car up to keep it consistent....<br>
I do one carb at a time. you have to do this I reckon or the one you aren't tuning can mess up all your efforts, especially if its doing half the work and is rich. I turn them with the idle screw so that one is doing all the work and giving the 1000 rpm. The final stage is to bring them both to the same hiss with the tube in the ear. Lifting the piston on each in turn should have the same effect as a final check.<br>
Tightening the clamps so both carbs come in together can also take a bit of practice. Most cars I get in i find one leads the other a tad...which can cause an iffy pull away.<br>
Jonners<br>
<br>


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[Toledo Man]

I'd like to point out that the "bloke" is James Carruthers, who should be well known to the Club Triumph members among us. He is a young Spitfire owner so some of the info might not necessarily apply to the Dolly. To quote him: "This isn't the definitive guide, but it works for me. It’s a combination of several different pieces of literature and also personal experience."<br>
<br>
Please bear this in mind before you prejudge what he has to say. He's an enthusiast like the rest of us.<br>
<br>


<p>Toledo Man<br>
<br>
1974 Toledo 2-door (currently a spares car for Snowdrop)<br>
1973 1500fwd (Baby Blue slowly being recommissioned)<br>
1971 1500fwd (spares car for Baby Blue & future donor for the "Stretch 1500" project)<br>
1983 Acclaim HL (Becky, my daily driver)<br>
1977 Dolomite 1300 (Snowdrop my other road going Triumph)</p><i></i>

[2F45T4U]

Where's the prejudging?

<p></p><i></i>

[Jon Tilson]

If the bloke does this for a living then he isnt an amateur and I apologise...<br>
<br>
If he doesnt then my discernment stands...<br>
<br>
I did do this for a living so I'm not...<br>
<br>
Jonners

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