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How to balance (tune) twin SU carburettors on a 1500 Triumph Spitfire

How to tune/balance SU carbs for smooth running, efficient running and maximum mpg. Also helps to keep the car running cool and start better.
Please enjoy the rest of my videos, and please remember to subscribe to keep up to date with my new content as my channel develops, I also have business facebook and instagram pages (Yorkshire Classic Cars Ltd) which you are welcome to like and follow that covers my customer cars updates every week

Пікірлер: 38

  • @ianwilliams1448
    @ianwilliams144816 сағат бұрын

    It still looked a smoother idle than my mgb , even when out of sync !

  • @paulmuff9883
    @paulmuff988316 күн бұрын

    I enjoyed you video 😀 by the way the nuts are BA not metric or whitworth 😀😀👍

  • @owenjones63
    @owenjones634 ай бұрын

    Thank you for this vid! Going to buy my Synchrometer today and have a go when the parts turn up, really informative and exactly what I was looking for

  • @YorkshireClassicCarsltd

    @YorkshireClassicCarsltd

    4 ай бұрын

    Thank you, glad to help. Check the timing first, sometimes takes a couple of goes to get it spot on

  • @owenjones63

    @owenjones63

    4 ай бұрын

    @@YorkshireClassicCarsltd have fitted all parts over the weekend sounds fine on idle but doesn;t go past 3500rpm when driving loses power? I've fitted new plugs, new battery and cleaned fuel filter and run it without fuel ca to try and get air through but feels like a compression issue to me now.

  • @kbrickell4732
    @kbrickell47322 ай бұрын

    I use a hose the my ear and go from carb to carb with my grip on the base to get the same depth in the air intake and set the same sucking noise in my ear

  • @ChrisFEJackson
    @ChrisFEJackson10 ай бұрын

    Yes it's an easy job when you have done it a few times. I have done my own car by ear I was out the first time when then using a sync, but after got used to the ear method. It can affect the temperature, once mine was set correctly it did drop about an eighth of a segment lower (TR7). Cheers. This is a good example for anyone to embark initially setting their dual carbs.

  • @YorkshireClassicCarsltd

    @YorkshireClassicCarsltd

    10 ай бұрын

    I hoped it would be of use, I usually do it by ear but check with the synchroniser just to be sure, but of course you can't really teach that, especially in a video it just comes from experience really

  • @davidstaines5440
    @davidstaines54405 ай бұрын

    Great explanation of running you own business I'm run my own Carpentry business in Queensland Australia, doing small renovations. I can identify with what you have spoken about.

  • @djwallington2497
    @djwallington2497Ай бұрын

    Est video I’ve see on how to set up the carbs. Thank you

  • @kosmo1001
    @kosmo10012 ай бұрын

    Yes please do a video on fuel mixture adjustment. Thanks

  • @DavidUKesb
    @DavidUKesb10 ай бұрын

    Excellent explanation but even as a newbie I've never understood why it is suggested to unclamp the linkage. Certainly using the SU balancing tool you don't do this. I then double checked using a flow meter (still with the linkage connected) and it was spot on. Very much enjoying all the videos on your channel.

  • @YorkshireClassicCarsltd

    @YorkshireClassicCarsltd

    10 ай бұрын

    It's to make sure that you adjust each carb individually, sometimes as you adjust one that's a long way out, it will start to open the other carb slightly, if that makes sense?!

  • @ChrisFEJackson

    @ChrisFEJackson

    10 ай бұрын

    @@YorkshireClassicCarsltd Also, from my experience, with engine running, once the adjustment is made, you need to 'blip' the adjusted carb & allow to settle, recheck and once happy move to 2nd carb. With the linkage loose it allows you to blip each carb in turn, after making any adjustment.

  • @kbrickell4732
    @kbrickell47322 ай бұрын

    You need a timing light to check the ing timing an many timing lights have a rpm counter

  • @mikegordon2840
    @mikegordon28403 ай бұрын

    Great video very helpful is there any chance you could show setting the mixture screws on the 1500 spitfire.

  • @YorkshireClassicCarsltd

    @YorkshireClassicCarsltd

    3 ай бұрын

    They don't have screws it's the nut under the carb that the jet slides through that adjusts thr mixture

  • @hankpb1
    @hankpb110 ай бұрын

    very useful , used info to do my TR7

  • @YorkshireClassicCarsltd

    @YorkshireClassicCarsltd

    10 ай бұрын

    Glad it helped

  • @togst
    @togst10 ай бұрын

    The balance process doesn't look terrible with the appropriate tools. I am considering getting a pair of SU H4 carburettors for my Volvo Amazon since SU seem to be a lot more popular than the downdraft Zenith. Difficult to find someone to refurbish a Zenith, but plentiful of people do SUs.

  • @ChrisFEJackson

    @ChrisFEJackson

    10 ай бұрын

    As Paul said, once SU's setup, lasts for years. Strombergs are ok but there is a diaphragm inside which does perish over time.

  • @YorkshireClassicCarsltd

    @YorkshireClassicCarsltd

    10 ай бұрын

    Sus are great, they have very few parts, so simple to work on and vert efficient. Used to run the original rover v8 ones on mybtuned rover, ported the bodies, wedged the pistons, even knife edged the butterflies, my rolling Road man made custom needles and it made really strong power. I love them

  • @ChrisFEJackson

    @ChrisFEJackson

    10 ай бұрын

    @@YorkshireClassicCarsltd I had a Grinnall conversion done in the 80's, the V8 had the SU's but each SU is shared between the banks, and the outer 4 pistons get a lower mix, I think there should have been 4 SU's on it, but the Holley with offenhauser manifold was a great update but a pain to set up!

  • @YorkshireClassicCarsltd

    @YorkshireClassicCarsltd

    10 ай бұрын

    @ChrisFEJackson I did it differently, used the stock manifold sawed off the pent roof (by hand!) Tapped and sealed the water bleed, removed the divider in the mouth and had an adapter for a twin choke weber welded on I fabricated. Used a 32/36 dgav many years then swapped for a 38dgas with the choke mech removed etc, drove very well right through the rev range, made 240@wheels at 5000 rpm

  • @ChrisFEJackson

    @ChrisFEJackson

    10 ай бұрын

    @@YorkshireClassicCarsltd You are the man!! That sounds bleddy brilliant!!

  • @johnperry7139
    @johnperry71395 ай бұрын

    Great video thanks 👍

  • @YorkshireClassicCarsltd

    @YorkshireClassicCarsltd

    5 ай бұрын

    Thank you

  • @majscrap2629
    @majscrap26293 ай бұрын

    I always adjust the fuel mixture when I balance the carbs.

  • @bshnabel
    @bshnabel8 ай бұрын

    Good video, thanks

  • @fazorboy
    @fazorboy10 ай бұрын

    Thats identical to mine right down to the carbs needing doing 😂😂😂

  • @YorkshireClassicCarsltd

    @YorkshireClassicCarsltd

    10 ай бұрын

    Is yours topaz too?

  • @fazorboy

    @fazorboy

    10 ай бұрын

    @YorkshireClassicCarsltd yeah it is. The one you were working on was in great condition there. If you could do a video on the mixture, that would be very interesting, esp for me. Thank you for the effort put into the video. Put very straightforward

  • @YorkshireClassicCarsltd

    @YorkshireClassicCarsltd

    10 ай бұрын

    @fazorboy thank you, I can do a mixture setting video, I've done that car now mixture wise, but I could do it again to show the procedure, it's pretty easy , but I have a wide band o2 sensor so I'm a but spoilt!

  • @stevesmith2214
    @stevesmith22149 ай бұрын

    Metric spanners on a 70's British car?

  • @YorkshireClassicCarsltd

    @YorkshireClassicCarsltd

    9 ай бұрын

    Yup, like I say in the vid, no idea what thread the crews are, but the metrics do the job admirably! Think they are bsf or Whitworth, but af doesn't fit as well as the metric!

  • @bernardwarr4187

    @bernardwarr4187

    4 ай бұрын

    I never found anything other than a 9mm fits! What size imperial do you use, or you don’t?

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