Slightly off tooic: Engine Masters on in 1/2hr 9pm east coast. Roots Blower testing. Originsl air date 12/17/21 . Ie: aToday

one is on a tunnel ram.

ya, you drop off engines and they take their sweet time but God forbid you dont get them the parts they need asap .

SB, thanx .. going to go check it out now.

I'm curious about the distribution between the cylinders... I understand that the fuel can be compensated with the port injectors and #'s will be more inline across all cylinders...But does anyone know what's happening with the airflow to cause this unevenness? Is the whipple causing dry spots in the airflow passing through the rotors? Is there less air flow to certain cylinders or dryer air?
I was told that the 8.3l had distribution issues over the 4.5l, was also told that they both require injectors at the entry to keep blower cool.
After reading the older thread about washing the cylinders down I'm leery on running too fat and risking fouling plugs etc...
I like the idea of splitting the injectors to fine tune and like the look of the tunnel ram...

As far as the Morel .904's ...haxby threw them out and we went with solids as they wouldn't hold steady around 5700rpm. These were some of the first sets that they produced mind you...I have come to the conclusion that it's easier to keep track of valvetrain if you have to maintain lash.

Help my feeble old mind here...if you are running on boost, that is positive pressure throughout the entire intake post blower. With sufficient positive pressure aire should flow corresponding to the opening i.e: valve diameter. So individual port./runner flow shouldnt make much difference unless there was a significant impairment??

It has to do with air velocity and the mass of the fuel. The air and fuel don't follow the same path at high velocity which causes fuel separation, circle track cars make mods to the intake to get the fuel to flow to the left bank. Check the Brodix site they list different intakes for circle track. When I ordered my intake they asked me what the application was because of that. Dart did a lot of wet flow testing to determine the best port design to prevent fuel separation.

I think it would be very interesting to be able to actually see the differences the way the fuel actually enters the chamber. Various inductions etc. You’d think even in a traditional NA app it would be nearly 100% atomized especially with the intake port speed at WOT. Any videos illustrating such?

Yup, many, but see following for cool factor (doesn’t show inherent issue of frt feeding screw blower though)

Not sure how true it is but years ago we all thought smooth polished intake ports were the way to go. But issue was fuel drops out and runs along the port, a slight roughness would kick the fuel back up into the air flow. At least that was the thought, way before we had cameras that could record this stuff.

I should have known you’d have this SB. All I had to do is ask! 😂. That’s a great video and more fuel in the liquid state than I would’ve thought.

I also agree with the non polished ports. Less puddling so to speak! I wonder how that would change with port injection. After watching that it’s no wonder why we burn so much fuel. Suckin gas and haulin azz! 😎

You would think so .
I would think it would be better with a ROOTS which is open at the bottom across the entire blower.
The whipple has a front opening so in my mind the runners under the opening would get most of the fuel but I have no idea what happens after it passes thru the intercooler .