Supercharging question
07-18-2004, 09:13 PM
#11
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Join Date: Dec 2003
Posts: 2,883
RE: Supercharging question
ORIGINAL: fast83gt
What's not true about it?
What's not true about it?
07-18-2004, 09:17 PM
#12
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Join Date: May 2004
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Posts: 558
RE: Supercharging question
This is a quote from Holley's website:
The Roots blower is the simplest of all blowers and therefore is also the least expensive. A Roots blower does not compress the air inside the supercharger. It is actually an air pump. The compression of the inlet charge (creation of boost) actually takes place in the cylinders and the manifold.
Centrifugal superchargers and screw type superchargers are called "internal compression" blowers because the air compression takes place inside the supercharger. Roots superchargers are "external compression" blowers because the air compression takes place outside of the supercharger.
The Roots blower is the simplest of all blowers and therefore is also the least expensive. A Roots blower does not compress the air inside the supercharger. It is actually an air pump. The compression of the inlet charge (creation of boost) actually takes place in the cylinders and the manifold.
Centrifugal superchargers and screw type superchargers are called "internal compression" blowers because the air compression takes place inside the supercharger. Roots superchargers are "external compression" blowers because the air compression takes place outside of the supercharger.
07-18-2004, 09:19 PM
#13
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Join Date: May 2004
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Posts: 558
RE: Supercharging question
Holley has some great info on their site follow this link:
http://www.holley.com/HiOctn/TechSer...fo/SCTech.html
I was a little off when I saidv "8.1:1 compression ratio is like running a 12.1:1"
it's actually 8.5:1 and 12.0:1
http://www.holley.com/HiOctn/TechSer...fo/SCTech.html
I was a little off when I saidv "8.1:1 compression ratio is like running a 12.1:1"
it's actually 8.5:1 and 12.0:1
07-18-2004, 09:25 PM
#14
5th Gear Member
Join Date: Dec 2003
Posts: 2,883
RE: Supercharging question
ORIGINAL: fast83gt
This is a quote from Holley's website:
The Roots blower is the simplest of all blowers and therefore is also the least expensive. A Roots blower does not compress the air inside the supercharger. It is actually an air pump. The compression of the inlet charge (creation of boost) actually takes place in the cylinders and the manifold.
Centrifugal superchargers and screw type superchargers are called "internal compression" blowers because the air compression takes place inside the supercharger. Roots superchargers are "external compression" blowers because the air compression takes place outside of the supercharger.
This is a quote from Holley's website:
The Roots blower is the simplest of all blowers and therefore is also the least expensive. A Roots blower does not compress the air inside the supercharger. It is actually an air pump. The compression of the inlet charge (creation of boost) actually takes place in the cylinders and the manifold.
Centrifugal superchargers and screw type superchargers are called "internal compression" blowers because the air compression takes place inside the supercharger. Roots superchargers are "external compression" blowers because the air compression takes place outside of the supercharger.
07-18-2004, 09:41 PM
#15
3rd Gear Member
Join Date: May 2004
Location:
Posts: 558
RE: Supercharging question
this site explains it fairly well
http://www.superchargersonline.com/content.asp?id=21
http://www.superchargersonline.com/content.asp?id=21
07-18-2004, 09:55 PM
#16
5th Gear Member
Join Date: Dec 2003
Posts: 2,883
RE: Supercharging question
"the centrifugal supercharger essentially acts as a high-speed fan"
i dont see any compression going on inside that diagram. theres something im not getting here. ill try to figure it out when i sober up[&:]
i dont see any compression going on inside that diagram. theres something im not getting here. ill try to figure it out when i sober up[&:]
07-20-2004, 06:43 AM
#17
3rd Gear Member
Join Date: Jul 2004
Location: Livonia,MI
Posts: 581
RE: Supercharging question
Think about it this way.
Blow into a straw(the straw being the pipe after the centrifical unit)and then put your finger at the end of the straw(acting as the throttle body) while your still blowing into it,what happens?
It has pressure built,then remove your finger and it flows.
That is why there is a bypass valve before the throttle body so when you let off the pedal,it keeps the whole system from surging.Besides,boost in terms of cfm is good.Boost in terms of backpressure is bad as it just means that there is a bottleneck somewhere else(restriction of flow).You are just trying to make the system as efficient as possible.That is why you see boost pressure.
Rye
Blow into a straw(the straw being the pipe after the centrifical unit)and then put your finger at the end of the straw(acting as the throttle body) while your still blowing into it,what happens?
It has pressure built,then remove your finger and it flows.
That is why there is a bypass valve before the throttle body so when you let off the pedal,it keeps the whole system from surging.Besides,boost in terms of cfm is good.Boost in terms of backpressure is bad as it just means that there is a bottleneck somewhere else(restriction of flow).You are just trying to make the system as efficient as possible.That is why you see boost pressure.
Rye
07-20-2004, 03:51 PM
#18
5th Gear Member
Join Date: Dec 2003
Posts: 2,883
RE: Supercharging question
ORIGINAL: 92BOOSTED
Think about it this way.
Blow into a straw(the straw being the pipe after the centrifical unit)and then put your finger at the end of the straw(acting as the throttle body) while your still blowing into it,what happens?
It has pressure built,then remove your finger and it flows.
That is why there is a bypass valve before the throttle body so when you let off the pedal,it keeps the whole system from surging.Besides,boost in terms of cfm is good.Boost in terms of backpressure is bad as it just means that there is a bottleneck somewhere else(restriction of flow).You are just trying to make the system as efficient as possible.That is why you see boost pressure.
Rye
Think about it this way.
Blow into a straw(the straw being the pipe after the centrifical unit)and then put your finger at the end of the straw(acting as the throttle body) while your still blowing into it,what happens?
It has pressure built,then remove your finger and it flows.
That is why there is a bypass valve before the throttle body so when you let off the pedal,it keeps the whole system from surging.Besides,boost in terms of cfm is good.Boost in terms of backpressure is bad as it just means that there is a bottleneck somewhere else(restriction of flow).You are just trying to make the system as efficient as possible.That is why you see boost pressure.
Rye
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