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S.U. Questions?
Posted: Thu Feb 21, 2008 7:49 pm
by cswagon
I've decided to dump my Strombergs and fit a pair of S.U.s but need to find out a couple of things if anyone can tell me please.
The fuel inlet pipe is obvious but is the fuel pipe layout the same as with the Strombergs i.e.one pipe from the tank,into a tee which is positioned immediately before the left hand carb and the pipe from the tee going over to the right hand carb which in turn goes through another tee and then returns to the tank!! If that makes sense.
Also, I understand the other pipe is a "float chamber vent pipe",so where does this get piped to please?
Many thanks
Graham.
Posted: Thu Feb 21, 2008 8:20 pm
by RoverP6B
Hello Graham,
I know very little about Stombergs, but from what you describe, the pipe layout sounds the same.
With the SU, a t piece at the LH (passenger side) routes delivered fuel to both carbs. A spill return pipe coming off the RH carb returns fuel to the tank. This line is a smaller diameter.
Both carbs have pipes coming off to vent the float chambers, and to direct fuel onto the ground in the case of fuel overflow which occurs when a float fails.
Each carb also has a breather for connecting into the engines breathing system.
You will have to investigate the linkages and where differences may occur.
I am not sure if the inlet manifolds are distinct for each type of carburettor.
Hope this helps,
Ron.
Posted: Thu Feb 21, 2008 8:28 pm
by cswagon
Hello Ron
Many thanks indeed for that,just what I was looking for.
The two pipes that take away the overflow fuel,do they just route out below the engine or out through the wheel arch or something?
Thanks again.
Graham.
Posted: Fri Feb 22, 2008 3:46 am
by RoverP6B
Hello Graham,
I am glad to have been able to help
With the SU, each float chamber vent pipe runs across the top of the inlet manifold, right next to the inside edge of each rocker cover, then turn down and drop right in front of the engine, skirting each side of the timing case pretty much.
Each vent exit needs to be in clean air, and not where fuel could come into contact with the engine or anything that is likely to cause a fire.
When floats fail, they typically fill with fuel, sink and the chamber will then overflow with fuel, exiting via the vent pipe. It will pour like a tap when this happens, and will only stop when you switch off the engine.
It has happened to me on two occassions in 23 years of running a P6B.
Ron.