*First off, I know that the companies currently making the vm34 kits have invested hours of r&d, and the easy route would be to just by a kit. My reasons for making my own are 1. My bike is already built and they probably won't fit. 2. I think it would be cool to make manifolds, if they work. 3. Why not try something different?
I've been thinking over making a dual VM34 carb set for my dohc cb750. I know there are a few companies currently making kits, both with very good feedback.
The two most popular kits are Murry's Carbs (sold by speedmotoco.com) and cyclexchange.net. Both kits use a tubular "y" design manifold (cyclexchange is cast, but tubular), but I've been considering an aluminum rounded-box manifold design similar to performance cars. While cars utilize one long tapered manifold I would make two. The carbs would sit directed as centered as possible, but the manifold would taper towards the further cylinder to increase air velocity in an effort to prevent the inner cylinders from running lean. Also, the manifold is wider near the outside cylinders to help prevent them from running rich because they are closer to the carbs. The outlet tubes to the cylinders would sit flush inside and have the welded connection area ground smooth/rounded.
I made a quick sketch of my idea, what do you think?
An aluminum race manifold:
I've been thinking over making a dual VM34 carb set for my dohc cb750. I know there are a few companies currently making kits, both with very good feedback.
The two most popular kits are Murry's Carbs (sold by speedmotoco.com) and cyclexchange.net. Both kits use a tubular "y" design manifold (cyclexchange is cast, but tubular), but I've been considering an aluminum rounded-box manifold design similar to performance cars. While cars utilize one long tapered manifold I would make two. The carbs would sit directed as centered as possible, but the manifold would taper towards the further cylinder to increase air velocity in an effort to prevent the inner cylinders from running lean. Also, the manifold is wider near the outside cylinders to help prevent them from running rich because they are closer to the carbs. The outlet tubes to the cylinders would sit flush inside and have the welded connection area ground smooth/rounded.
I made a quick sketch of my idea, what do you think?
An aluminum race manifold: