Exhaust manifold design

[zx_volcane]

Can see what you're saying ripp, if you've got the sense to knock up a log mani form scratch might as well go tuned el.

My simple relocation mani cracked first due to welding it up in far from ideal surroundings, outside in the wind, and then the 2nd time it cracked not on the weld but the material itself sheared.

So agree its not a function of the design, but how it was implemented that caused it to fail in my case.

Would love an el pulse tuned mani - paul are you paying attention :p

Out of interest has anyone got a link to the formulae for working out the lengths / dimensions ..etc based on cam profile, engine size, rev range Sure I've seen it around the internet somewhere.


And if anyone is willing to knock up a short run of exhaust manifold flanges that would be ideal, don't fancy trying to cut one out of steel plate with the plasma, and the quotes I've had so far were pretty expensive.