Rootes Blowers

Ok guys don't hammer me here.

On a covential roots blower, does the air and fuel get pushed to the front of the blower or the back. I always thought the front but was told the other day the back. Just trying to work out how lean/rich to run the cyclinders from front to back.

Thanks for any help

John Clayton.

 

Hey Mike, DID YOU KNOW? That it was discoverd by a guy spinning his blower over on a bench, and he blew smoke in the injector and noticed that it came out the front. And they say smoking is no good for you,lol lol

 

John I Would Say On A Conventional 6-71 Mounted On A Conventional Bbc Or On A Conventional 6 Mounted To A Hemi The Air Does Screw To The Rear Of The Case And As The Rotors Pump It Around To The Bottom Side It Starts To Squeeze It Out Towards The Front Of The Blower. Cylinder Fuel Distribution Will Be Depend Some On Blower Manifold. If You Have Say An Old Crager Flat Plenum Manifold Versus Say A Newer Indy Cylinder Head Intake With Some Port Runners It Will Be Different. Typically On A Conventional Set Up Number Two Cylinder Is The Warmest. Also Depends If You Are Running All Your Fuel Thru The Hat Or Do Port Nozzles. Getting The Cylinders All Even With Just Hat Nozzles Can Be A Little More Tricky.

 

it pushes the air forward, that is why front discharge blowers were developed, to use the direction of the air flow efficently!

 

Thanks for the help guys. To answer some questions. We are running hat and port nozzles with a stagger with the smaller ones at the front and slightly bigger ones in the middle because of the heat as mentioned by another poster. Indy manifold. Once again thanks for the help it is much apprepricated.

John C

 

Interesting John,
So does that mean the fuel is going forward as well.
I have found on my Wedge chrysler number 1 cylinder is always getting more fuel then any others.This is with a indy manifold.
I have staggerd nozzels smaller in front to larger in rear.I could be wrong here ,this is just what I have found.

 

Mike,

Running hat nozzles, should these be staggered from small at the front to larger at the back because of the fuel being pushed to the front on exit. Your mention of running larger port nozzles in the front makes sense but most set-ups I have seen have them small at the front and larger at the back. I guess this is intended to distribute the fuel more evenly because of the affect the hat nozzles have. Upon thinking about this, I guess with smaller port nozzles at the front, these cyl will be lean becasue of the air.

Any help is much appreciated Mike. Thanks heaps.

John C

 

set back blower

if you pay attention to the national events broadcasts on espn you will remimber the discussions of the set back blower! the set back blower is a blower that is set back from the front of the manifold and basicly placed the front of the blower over the second cyl bank. this was designed because a typical blower forces most of the air to the front two cyls. the set back now forces about the same air to the front two and second clys 1-2 and 3-4. and a little more air will go into the 5-6 cyls and so on. when usuing port nozzels you want to stagger them the largest in the front to the smallest in the rear. think about it more fuel mixed with more air provides a hotter cyl do not stagger small to large you will have the fuel distribution all screwed up. good luck rick.

 

hat nozzles

i just noticed your question was for hat nozzels. they are the same as the port nozzels as far as larger in the front staggered to smaller to the back. if you put larger in the rear you will load up your clys with to much fuel. plus fuel gets carried down the blower rotors allready and dumps them in the rear cyls. good luck rick

 

Thanks for the help Rick it is much appreciated. Just trying to clear up a few inconsistencies in info I have been told.

John C