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Hi Kevbo - With 8 carbs involved, the return at a highish pressure is VERY important. With 6 psi it evenly distributes fuel to all 8, fills all chambers, allows the Pop Off valves to function and finally clear any air etc. back to the tank. Multiple SBN's will not function without an effective...

I decided to go SBN for safety reasons. I race in Hill Climbs & sprints, something like Pikes Peak. If I had/have an accident and car turns over with the float chambered carbs, there would be lots of fuel spillage - potential fire. THE SBN's offered a good solution and, once tuned, do provide a...

Hi All - good replies, thanks I am now up to 6 psi fuel pressure using the changed Pop off valves,springs etc. I have 8 of the SBN carbs on the V8, each bank of 4 fed via a separate electric fuel pump. Each bank of 4 has return pipe to the tank. I have 1mm ( 0.040") orifice in each return pipe...

I did all my initial set up at 1000 rpm, finally got race car running quite well, now fine tuning.

Hi All - final question: Anybody know what the diaphragm pumps on a Super BN will lift i.e max height from fuel tank to carb pump inlet?

ryan0 - I think you have saved me going mad! I live in the UK and been struggling to get my V8 Evinrude fitted with 8 Mikuni Super BN 44-40 carbs running correctly. Its fitted into a Sports race car. I am at the end of the 3 year build project and the engine suffers exactly the symptoms that...