logo1 logo2 WOLF PACK CAR CLUB
logo3 logo4
User CP Register FAQ green-end

Wolf Pack Car Club Forum > The Garage > Tech, How-To & Info Articles
Thread Tools Display Modes
Old 02-13-2007, 09:06 AM   #1
Posts: n/a
Superchargers A-Z (Part 2 of 3)

**Originally posted on SuperchargersOnline.com**

Superchargers A-Z (Part 2 of 3)

Welcome to part 2 of "Superchargers A-Z". If you haven't already read part 1, of this series, you may want to start there.

Some of you may have recognized in part 1 of this series that in the early days of supercharging, there are three types of superchargers - roots, twin-screw, and centrifugal. You may already be familiar with these buzz-words, but most people don't understand how each technology differs. Before buying a supercharger, you should familiarize yourself with how each type of supercharger works. Each has its own set of advantages and disadvantages that may make it ideal - or not - for your performance needs. Today we take a technical look at the technology behind each type of supercharger.

First lets begin with some basics. There are many components that go into making a complete supercharger system - mounting brackets, ignition controller, fuel pump, etc. In this article we look at only one component of a supercharger system - the supercharger itself (sometimes called a "head unit", "compressor", or "blower"). All superchargers, except turbochargers, are driven via a pulley that is connected either to the engine's accessory belt, or to its own belt that goes directly to a crank pulley. This is where the similarities between the different supercharger technologies end.

The Roots Supercharger (aka "blower")

The roots supercharger was originally designed as an air moving device for industrial buildings. The roots supercharger features two counter-rotating lobes that trap air from the intake side of the supercharger (normally at the back of the supercharger), move it around the outside casing of the lobes, and out the bottom of the supercharger through an outlet / discharge port. Like the twin screw supercharger, the roots is a "positive displacement" aka "fixed displacement" supercharger, meaning that it moves a fixed volume of air per rotation. Notwithstanding minor amounts of air-leak at low rpms, the roots supercharger cannot flow backwards like a centrifugal supercharger, and is thus nearly as efficient in its ability to pump air at low rpms as it is at high rpms. What this means is that roots superchargers are very capable of making large amounts of boost even when engine rpms are very low. This makes for great low-end and midrange power, and also makes them great for trucks and towing vehicles. The roots is also self lubricated, and is the simplest of the supercharger designs, meaning it is reasonably priced and very reliable. This is why roots superchargers have been the choice of GM, Ford, Mercedes, and Toyota for OE applications.

The only real disadvantage to the roots supercharger is that it creates a lot of heat. There are two reasons for this. First, the roots supercharger does not compress air - it only moves from the intake port to the discharge port (i.e. it is the only supercharger design with no internal compression ratio). All of the compression is done in the intake manifold. Laws of thermodynamics kick in in favor of supercharger designs with an internal compression ratio (centrifugal and twin screw) because they do less work on the incoming air charge. We will leave the mathematics of this phenomenon to a later (much more boring) discussion. Another reason roots superchargers create higher amounts of heat is because they tend to carry some of the compressed air in the intake back into the supercharger because it gets trapped by the rotating lobes that are exposed to the hotter air in the intake manifold.

A roots supercharger ("blower")

Want to know why a roots supercharger creates more heat than a centrifugal or twin screw? Calculate the amount of work each does on the incoming air charge and measure the area underneath the curve on the Pressure Volume Graph.

The Twin Screw Supercharger

The twin screw supercharger at first glance appears to look similar to a roots supercharger both inside and out. The two technologies are indeed similar, however there are significant differences. At the heart of the twin-screw supercharger are two rotors, or "screws" that rotate towards each other. The rotors mesh together and draw air from the back of the supercharger. The twisting rotors move the air to the front of the supercharger, while compressing the air before discharging through a port at or near the front of the supercharger.

Because the compression is done inside the supercharger, this design produces less heat than a roots supercharger - in fact, it is almost as thermally efficient as a centrifugal design. Like the roots design, the twin-screw is a fixed displacement supercharger (meaning that it pumps a fixed volume of air per revolution), and because the tolerances between the rotating screws are very tight, its ability to create boost at low rpms is unparalleled. These characteristics make it ideal for trucks and towing vehicles, where low to mid range power is primary in importance. Another important advantage of the twin screw compressor is its reliability. Unlike a roots supercharger, the rotors in a twin screw supercharger do not actually touch, so there are virtually no wearing parts. For this reason, twin screw compressors are commonly used to pressurize cabins in passenger aircraft. Like roots superchargers, twin screw superchargers are self lubricated and do not tap into the engine's oil supply.

One disadvantage of the twin screw design is that, because it has an internal compression ratio, the twin screw is compressing air even when it is not sending boost to the engine (i.e. under cruising or deceleration). An internal bypass valve releases the pressurized air, but because it takes work to pressurize the air in the first place, the twin screw supercharger draws more power from the engine than while not under boost. Like the roots, the throttle body must be placed before the compressor because it is a fixed displacement supercharger.

A cutaway view of a twin screw supercharger

Airflow through a twin screw supercharger

The Centrifugal Supercharger

Although the centrifugal supercharger is founded on a technology much newer than either the roots or the twin screw, it was the first supercharger to be successfully applied to automotive applications. Unlike the roots, the centrifugal supercharger is NOT a positive displacement / fixed displacement supercharger because it does not move a fixed volume of air per revolution. The centrifugal supercharger essentially operates like a high speed fan propeller / impeller, sucking air into the center of the supercharger and pushing it to the outside of the rapidly spinning (40,000 + rpm) impeller blades. The air naturally travels to the outside of the blades because of its centrifugal force created by its rotating inertia. At the outside of the blades, a "scroll" is waiting to catch the air molecules. Just before entering the scroll, the air molecules are forced to travel through a venturi, which creates the internal compression. As the air travels around the scroll, the diameter of the scroll increases, which slows the velocity of the air, but further increases its pressure.

The centrifugal supercharger enjoys several advantageous characteristics that make it the most popular supercharger design in the aftermarket world. First, it is simple and reliable because it has very few moving parts - just a few gears and the impeller. Second, the centrifugal supercharger produces very little heat because of its internal compression ratio. It is also small in size and very versatile because it can "free-wheel" and allow the engine to suck air through it or even flow air backwards. For this reason it can be placed anywhere in the intake tract - it can even "blow through" the throttle body, meaning it can be mounted nearly anywhere. It is also the most thermally efficient supercharger, meaning that it produces the lowest discharge temperature.

The only significant disadvantage of the centrifugal supercharger is that it must be spinning at a relatively high speed before it begins to make a significant amount of boost. For this reason, it is not helpful in creating boost (and power) at low engine RPMs. Normally the supercharger only begins to create boost at around 3000 rpm, and the boost curve gradually and increasingly rises with engine RPM. Many centrifugal superchargers do not have a self-lubricating oil system, and draw oil from the engine's oil supply. The disadvantage to this is that you must tap the oil pan for the oil return line. However, in doing so, the supercharger becomes virtually maintenance free. Some manufacturers make a "self-contained" centrifugal supercharger that is self-lubricated like roots and twin screw superchargers.

A centrifugal supercharger

Airflow through a centrifugal supercharger

The Turbocharger

You may be wondering where the turbocharger fits in to this equation. Technically, a turbocharger IS a type of supercharger - one that is driven by exhaust gases rather than from a pulley that draws power from the engine's crank. Because we have covered this topic in depth in our Turbos vs. Superchargers article, we will not re-examine the differences again here. Because the turbocharger relies on a technology substantially different from the three traditional supercharger technologies discussed above, it is beyond the scope of this article.

That's it for part 2 of the series - next time we'll pull everything together and discuss what goes into making a complete supercharger system, and how the supercharger works in conjunction with the engine.
Attached Thumbnails
Click image for larger version

Name:	centrifugal_supercharger.jpg
Views:	687
Size:	10.9 KB
ID:	1291   Click image for larger version

Name:	centrifugal_supercharger_diagram.jpg
Views:	702
Size:	9.0 KB
ID:	1292   Click image for larger version

Name:	roots_blower.jpg
Views:	1531
Size:	19.1 KB
ID:	1293   Click image for larger version

Name:	roots_pv_formula.gif
Views:	638
Size:	3.6 KB
ID:	1294   Click image for larger version

Name:	twin-screw-cutaway.gif
Views:	691
Size:	20.7 KB
ID:	1295  

Click image for larger version

Name:	twin-screw-diagram.jpg
Views:	646
Size:	14.4 KB
ID:	1296  

Last edited by SilentNoise; 02-13-2007 at 09:20 AM.
  Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
superchargers Johnny Mustang Tech Talk 45 08-12-2008 04:55 PM
Superchargers A-Z (Part 3 of 3) SilentNoise Tech, How-To & Info Articles 0 02-13-2007 09:15 AM
Superchargers A-Z (Part 1 of 3) SilentNoise Tech, How-To & Info Articles 0 02-13-2007 08:53 AM
Caption This....Part 2 yyc_tbird_sc The Den 16 10-18-2006 06:47 PM
bbk cai part#1718 ROB 98GT Parts 1 01-17-2006 12:47 AM

All times are GMT -6. The time now is 08:27 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.

© WolfPackCC.com, Wolf Pack Car Club
Comments/posts made in the forums are that of the poster and do not necessarily reflect the opinions of the WPCC.
Content within the site is property of the Wolf Pack Car Club and it's registered members. It is not to be used in any way without prior consent.