Jon, this is a little off-topic, but it still deals with multiple carbs. I'm considering using three Keihin side drafts on a 261 stroker (close to 300 cubic inches) so each carb only has to supply one cylinder in the firing order on each intake stroke. The Keihin is a Harley Davidson application with the vacuum-operated variable venturi piston like an old S-U carb. Assuming I get it dialed in properly on mixture, what's your opinion of using a triple side draft setup on an inline six? It seems to make more sense than duals. Obviously, I'll have to fabricate my own manifolds.
Jerry
Jerry - I started a new thread so we don't hijack the other thread.
I like triples on an inline 6. For years I have preached that the number of barrels (or plenums) should an even divisor of the number of cylinders (which is why tripower on a V-8 doesn't work well!).
When you start playing with your manifold, get in touch with panic. Some time ago he posted the following link to his website:
http://victorylibrary.com/mopar/intake-tech-c.htmThis is the very best intake manifold article I have read in 55 years! The man knows his material!
Hope you are not thinking of an IR manifold. My personal belief is that the Chevy 6 doesn't have the RPM capability to really use an IR design; so three plenums, with interconnecting pulse tubes.
As to the Keihin carbs: I detest them! Probably will get other opinions here, but I spent more than 40 hours trying to make a worn-out Keihin on a 1972 Honda Civic (We make it simple? - Yeah, right!) function. A good friend of mine volunteered my services to a little old lady who couldn't afford a flange gasket, let alone a carb rebuild. It was a pro bono job. Take a look at the second line in my signature!
If I were doing it, I would take a page from Chevrolet, and use three Carter YH carbs. The Corvette versions are too expensive to think about; but Dearborn Marine used a similiar carb, and they are fairly reasonable. Of course, Dearborn is allied with that company whose name we cannot mention here, but the same as that singer from our youth Tennessee Ernie
Jon
