i have all ways thought that a screw type blower was the same thing as a root type blower. i thought it had two names. i was told there was a difference. is there a difference? if there is one, what is it? thanks. also i want supercharger for my 01 ford f150 with a 4.6l. i like the looks of the centicial blower made by procharger. i just keep hearing that i need a roots blower. any real reason why?

furrby

 

The shape of the rotors is the difference.
The twin screw is more efficient.
Centrifugal is most efficient.

Positive displacement types (twin screw and roots) makes boost constant throughout the rpm range.
Centrifugal blowers increase boost as rpm increases.

I think a twin screw would be best for a truck.
http://www.whipplesuperchargers.com/

 

Oh crap here we go again. I don't *think* that a centrifugal is the most efficient. (Adibatic - thermal efficiency)

Edit: Here's the other thread discussing efficiency https://www.ford-trucks.com/forums/s...light=adibatic

 

i think my mine question was maybe over looked for my second question.
is a root blower the same thing as a screw type blower? someone told me that they were different. i would like to know if there are different, what are the differences? thanks. i will check the thread above on blowers. i like the looks of a centrifugal blower made by procharger. thanks again.

furrby

 

Linear versus helical lobes. Roots are linear, twin screw are helical.

 

From KB's website;

http://www.kennebell.net/techinfo/ge...romcatalog.pdf

 

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BLURRY94, that is a great link. i got answers to my question and new answer to the new questions i would of had. thanks a lot.

furrby