Intake Port Tumble
I read it as a snotty reply. True or false?
False. No snot intended. It's just that I have asked two or three times so far about the oddball guides and at the time no one had replied. {Thanks Moper} You stated people don't take advice from people who've done it. I realize you were referring to manifolds, and my first question was about that, but things have advanced beyond the intake, as you'd have ascertained if you'd read the post. I don't have a flow bench, hence me being on here asking questions of those that have indeed been there done that. I don't have a bench or spare heads to research what works and what kills them, so random grinding in hopes of a good result is out.
I asked whether or not the difference in manifolding alignment was worth another $250, and that went unanswered by anyone, so I decided to just stick with the RPM, since I had it laying around. The port windows and pockets are done for better or worse, on to the guides.
As yet, I still only have one opinion on the guides, and I'm inclined to agree with Moper, leave them alone for the most part.
What I'd REALLY like to know at this point involves the shape of the guide in the bowl. If the flow does indeed have spin around the axis of the valve, induced from the curved guide, should the teardrop shape be angled more in the direction of the swirl? Or equal on both sides like a regular port, or just left flat on top as cast?
The guide's shape in the bowl looks more like a rudder to me, with the narrow straight areas and deep hollows on each side. The flat area on top looks designed to induce tumble. Odd combination of shapes even for the factory. Again, and no panty twisting intended, what's the best way to proceed in the bowl/guide area on a 308 head?
