To clarify the header - does anyone know what effect there will be, by increasing the length of the silicon hose connectors for attaching bike carbs to the manifold?

I need to move my carbs away from the engine, to avoid fouling the nosecone.

Longer runners generally deliver greater torque at lower revs.

But, be careful, as on the overrun long lengths of flexi hose will squash, it would be advisable to put some ally liners in the 'floppy' bit.

Forgot to add - length increase = 25mm. Don't think the (42mm) connector hoses would collapse too much with that small-ish(??) increase. Has anyone had practical experience of this modification?

What's the total unsupported length after the increase? I think you'd be surprised just how easily silicone tubing will collapse when used for this application.

IME the majority of DIY induction systems for normally aspirated engine are made too short for the RPM range of the engine.

I had fuel filler hose on one set
If you extend the silicon then you need fluro lined or fuel will eat them
It's worth running some support from the manifold to the carbs to stop them drooping and possibly pulling off
Also stops the carbs bouncing up and down which will stop them working properly

If you want real world experience then some Weber DCOE fitments use a steady bar for each carb

[Edited on 4/6/16 by snapper]