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Found 3 results

  1. By way of introducing myself to Sideways I proffer this description of SU operation. 'Mixture spread' is a little known feature of SU operation. It means that a given position towards the top of the needle will give different mixtures according to the butterfly opening, at the same air flow. https://supertrarged.wordpress.com/2017/07/10/how-does-an-su-carburettor-work/ (pdf to download) Happy to discuss on here as I dont use the wordpress facility Peter
  2. Hello, I'm pretty close tuning my dual HS4 carbs on my '78 1500 Spitfire. I've purchased and read several books, scoured the web, but just can't hit the sweet spot on my carbs. I'm setting them up for aggressive driving fpr solo Autocross events. I can't seem to solve for a stumble under full throttle at the upper RPM range 4000 RPM and above. Can anyone suggest a course of action to assist me? I know the tune of the car matters to setting, so here is what I have. Newly rebuilt engine, 270 cam, flat top pistons, valves adjusted and readjusted to .012 thousands, NGK sparkplugs with .03
  3. Hello, I am in need of a servicable SU AUD 2140 float bowl HS2 spitfire) for my project car. I live in the US in Maryland. If you have one you would be willing to sell, please pm me. James
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