All Small Six Intake Port Divider with 2 Barrel Conversion

[NickC]

I always have the same probably stupid thought whenever I see someone custom crafting a way to get more air into these relatively restrictive cast-in intake manifolds. The front and rear cylinder intakes are especially far removed from the single centered intake, and tend to be starved for air and gas. Has anyone ever used the plugged openings in the ends of the log to let some more air in? Having that sort of plenum sitting up above the log is halfway there already. Run some tubes from the front and back of that plenum above the log and U-turn back into the log ends. Yes, it's hardly the most efficient path with those bends, but it should be better than no path. Maybe it would work well enough that the center inlet opening wouldn't need all that machine work to enlarge it, and it could be more or less a bolt on kit. Let the laughter begin...

I don't think this is a bad idea! However, my intuition is that if you mapped out the flow with the extra lengths and curves, that the benefit would be low and perhaps even imbalance the flow enough to where you would see some unusual behavior during accelerate and deceleration. But it would be worth modeling! One idea, that I think might help, would be to replace the flat bottom plugs with a radius/curve bottom plug to help direct the flow to the end cylinders. This would likely smooth the flow and give a potentially measurable benefit. I considering adding these types of plugs this past winter, but I was anxious to get back on the road! Maybe next winter.

 

[NickC]

@NickC Nice work on the box. It would be interesting to see what the AFR of each cylinder is, using a conversion, a box, and a modified box like yours with intake port divider. Where on earth did you find a Super Sniper? It's listed as unavailable everywhere I've seen it. It will be very useful if you decide to go to forced induction >1 bar in the future.

I agree - it would be data worth having! My port divider is removable. Someday I might remove it and retest, but I think I may need a more sensitive test method....and a free weekend! I bought the Super Sniper two years ago. I didn't realize they were out of stock! yikes!