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Single Seater SU Carb Position
#1
The single seater is getting to the stage where it is nearly driveable.  The engine has a Pigsty 4 into 1 exhaust manifold ( the only Pigsty part on it!) and I have an ALR semi downdraught inlet manifold which has been in the cupboard for years.  The intention is to put a 1 and 1/8" SU on the engine.
When I put the manifold on with the necessary spacer/adapter so that the carb is above the exhaust (ie semi downdraught), I find that there is not room for the choke mechanism to open as it only just clears the exhaust, this being slightly upswept.
I have inverted the inlet manifold so that it is now semi updraught and fitted the carb, having reversed the position of the float chamber.
The carb now fits but there is only about 1/4" between the oil damper top and the exhaust.  On the plus side the float cha             mber is not directly over the hot exhaust and the installation is neat, not requiring a modified bonnet top.   Also the car is based on Mrs Jo-Jo which had updraught carb(s).
I would welcome comments and advice.  I think I have seen some discussion about whether it is wise to have the float chamber behind the carb.  I would stress that at the moment i am only looking at getting the car running, the fancy engine will have to wait.  I like the fact that the updraught set up will keep the bonnet line clean and free from big holes and bulges and carb parts sticking out.
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Messages In This Thread
Single Seater SU Carb Position - by Malcolm Parker - 11-05-2021, 03:32 PM
RE: Single Seater SU Carb Position - by Alan - 11-05-2021, 06:48 PM
RE: Single Seater SU Carb Position - by Charles P - 11-05-2021, 06:49 PM

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