Plenum upgrade "Real performance or Hype"?

[jaykay]

Originally Posted by Jake Raby

No, on an normal aspirated engine the short side radius is always where the greatest air speed and velocity will be found. On the flow bench, the long side can have a pitot tube introduced and you'll find no velocity, or a slight vacuum.

This is why I laugh when I look at the arrangement that some out of work practical Engineer did in his Garage, using a vacuum cleaner blower motor to blow over objects, in an attempt to design a component.

The short side is where the men are separated from the boys, and it doesn't mater what it looks like, all that matters occurs on the flow bench.

Yes agreed but I am talking about bank to bank flow pulses over the divider blade where you see relief holes......normally that would be a dead area yes

[Jake Raby]

Originally Posted by jaykay

Yes agreed but I am talking about bank to bank flow pulses over the divider blade where you see relief holes......normally that would be a dead area yes

Those holes are for lightening the casting, not performance. A pitot tube in that location will show zero air speed.

[Hawaiian Driver]

Thanks Guys, you've really given me great info. I think I'll just leave that alone. Don't really need more power, just have the itch to tinker with things. This is a mod I can live without. Reward vs effort isn't there