Notices

positive displacement

Thread Tools
 
Search this Thread
 
Old May 11, 2005 | 12:48 PM
  #1  
furrby's Avatar
furrby
Thread Starter
|
Senior User
Joined: Oct 2003
Posts: 299
Likes: 0
From: north carolina
positive displacement

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
 
Reply
Old May 11, 2005 | 02:17 PM
  #2  
F150daniel's Avatar
F150daniel
Posting Guru
Joined: Mar 2003
Posts: 1,253
Likes: 2
From: spartanburg, SC
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/
 
Reply
Old May 11, 2005 | 08:53 PM
  #3  
FTE Herman's Avatar
FTE Herman
Post Fiend
Joined: Jun 2003
Posts: 5,983
Likes: 2
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
 

Last edited by hkiefus; May 11, 2005 at 09:02 PM.
Reply
Old May 12, 2005 | 07:48 AM
  #4  
furrby's Avatar
furrby
Thread Starter
|
Senior User
Joined: Oct 2003
Posts: 299
Likes: 0
From: north carolina
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
 
Reply
Old May 14, 2005 | 09:47 PM
  #5  
FTE Herman's Avatar
FTE Herman
Post Fiend
Joined: Jun 2003
Posts: 5,983
Likes: 2
Linear versus helical lobes. Roots are linear, twin screw are helical.
 
Reply
Old May 15, 2005 | 10:45 AM
  #6  
Blurry94's Avatar
Blurry94
Moderator
20 Year Member
Joined: Jun 2003
Posts: 3,550
Likes: 71
From: Calhoun GA
Club FTE Gold Member
From KB's website;

http://www.kennebell.net/techinfo/ge...romcatalog.pdf
 
Reply
Old May 15, 2005 | 08:57 PM
  #7  
bbutler's Avatar
bbutler
New User
Joined: May 2005
Posts: 7
Likes: 0
..........
 
Reply
Old May 17, 2005 | 12:02 PM
  #8  
furrby's Avatar
furrby
Thread Starter
|
Senior User
Joined: Oct 2003
Posts: 299
Likes: 0
From: north carolina
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
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

 Verdad Gallardo
story-1

Top 10 Fords at 2026 Carlisle Ford Nationals

 Joe Kucinski
story-2

3 Best / 3 Worst Parts of Modern Ford Ownership

 Brett Foote
story-3

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

 Pouria Savadkouei
story-4

Every 2026 Ford Engine Explained

 Brett Foote
story-5

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-6

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-7

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-8

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-9

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote




All times are GMT -5. The time now is 02:47 PM.

story-0
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.

By Verdad Gallardo | 2026-06-12 11:01:55


VIEW MORE
story-1
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-2
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-3
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-4
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-5
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-6
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-7
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-8
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-9
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE