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General Category => General Discussion => Topic started by: Simon_London on August 21, 2015, 04:20:12 PM

Title: Mounting 40mm carbs on Le Mans
Post by: Simon_London on August 21, 2015, 04:20:12 PM

Can I mount 40mm Dellortos on the standard inlet rubbers for Mk 1/2 2 Le Mans 36mm manifolds / rubbers ?

Will this mod work?

Or do the heads need to be ported to accept 40mm manifolds and rubbers?

Will I need to change the slide?

Thanks

Simon

Title: Re: Mounting 40mm carbs on Le Mans
Post by: NCAmother on August 21, 2015, 04:38:50 PM

I don't know about using the original rubber mounts, I've never used them.  I have Keihin 41mm, with fuel resistant hose to 'stock' intake manifolds. The intake manifolds and heads have been heavily ported and gasket matched.  Doing all the port work , as well as the 'built' motor, required bigger carbs to maximize optimum power/torque.  Is your motor stock?  If so, you should probably stick to the original carb size.

Title: Re: Mounting 40mm carbs on Le Mans
Post by: pressureangle on August 21, 2015, 09:52:10 PM

No, and you don't want 40's on it either. Even on the LM IV, the 40's are cranky and need a light touch below 3500 rpm. On a smaller engine with less compression you'd regret the effort.