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Bike Carb Manifold Vacuum Take-Off/tank


agent_zed

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Hi,

just working my way through a load of jobs on the 2b and trying to push on and get my bike carbs on there.

 

I'm just finishing up the manifold and thinking about vacuum take offs. I definitely need them as i have servo and vac advance on the carb and ideally want to vent the crankcase back into the engine.

 

So my plan is to make a simple vacuum chamber. I was going to use mig tips (6mm thread) and centre drill them out to 4mm. Will this be enough?

 

The chamber will then have a take off for the servo and vac advance.

 

The other thing i am not sure about it how to vent the crankcase back into the manifold. Can i vent into this chamber? or will that remove any vacuum created? Do i need a direct vent into one of the runners?

 

I don't really want to run without a servo as i am used to the setup after 10years :)

 

any advice appreciated.

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cool. What did you use for the connections to the manifold? will 3.5/4mm holes for each be enough of a vacuum?

 

can i add the crankcase vent into this? i still run with the ford stock setup with the valve thingy from the crankcase and then pipe into manifold.

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cool thanks. I happen to have some 22mm stainless pipe which i might use and weld up the ends, Mostly so it all looks the same :) alternatively i wondered about using some 2 inch stainless tube i have and making a 6inch container (just weld a cap top and bottom) which could have a flange on to bolt to the block as there are 2 bolt holes unused near the front of the engine (pinto).

 

I'll see what fittings i've got kicking around that fit the pipes from servo etc :)

 

thanks

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