nytrdr24
+1y
Been a minute since I was on here last, a-lotta stuff going on right now...
I too like the idea of the look & performance with an individual runner setup, but the mazda head design is a pain in the arse as far as designing a manifold, not to mention there isn't much the performance minded person can do in terms of helping out the mazda head....as far as designing a manifold, the coolant passages on the head are a pain, no vaccum reference on the weber dcoe carbs to work with the advance on the distributor so you either have to come up with something in the manifold design, or tinker with the distributor, not to mention a vaccum reference for the brake booster, argh!! Now that you know my pain, I'll tell you what I do know otherwise...
There isn't an off the shelf manifold available, well, let me take that back, there is a company in south africa (rowland manifolds they make what would be the way to go in my mind, that is if you want to go with a fuel injection setup (which with a ford edis would do away with the dizzy vaccum reference prob), which is more tuneable than the weber carbs, but I'm to far gone down the path I'm on with the webers on this build cost wise to swap over to fuel injection at this point.
Cannon used to make mani's (ones that you see on most yota 22r engines) but, they aren't available anymore, & haven't been for some time (if you find one, latch onto that rare piece of gold!)....which lead me to just design my own, it is still on paper (cad) at the moment, but I should have one turned out in the near future (fingers crossed) as soon as I work out some of the issues I mentioned earlier.
As far as your other question about what size carb to run, the 40 dcoe's should be plenty big enough (with what you said) unless you going
ballz-to-the wallz with your engine build, I got 45's, and I will prolly have to de-tune them some even with what I am doing to my motor...
Hope that helps ya out some