Supermodel Dyno
07-21-2005, 06:57 PM
#91
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Y'all are much smarter about this than I but everything I have read has said the twin screw has lower discharge temperatures and less parasitic.
I hope this can stay educational as opposed to confrontational.
http://www.kennebell.net/techinfo/ge...romcatalog.pdf
I hope this can stay educational as opposed to confrontational.
http://www.kennebell.net/techinfo/ge...romcatalog.pdf
07-21-2005, 07:08 PM
#93
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Originally Posted by Jim_H
Y'all are much smarter about this than I but everything I have read has said the twin screw has lower discharge temperatures and less parasitic.
I hope this can stay educational as opposed to confrontational.
http://www.kennebell.net/techinfo/ge...romcatalog.pdf
I hope this can stay educational as opposed to confrontational.
http://www.kennebell.net/techinfo/ge...romcatalog.pdf
Glenn
07-21-2005, 07:13 PM
#94
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Interesting comments about the centrifugal blowers...
"At low rpm and partial throttle the [centrifugal] blown Cobra feels as if it has less torque than
the second hand of a $4 alarm clock"..........
MOTOR TREND (1996 Mustang Cobra 4.6L 4V)
Here the link:
http://www.kennebell.net/techinfo/ge...erchargers.pdf
"At low rpm and partial throttle the [centrifugal] blown Cobra feels as if it has less torque than
the second hand of a $4 alarm clock"..........
MOTOR TREND (1996 Mustang Cobra 4.6L 4V)
Here the link:
http://www.kennebell.net/techinfo/ge...erchargers.pdf
07-21-2005, 07:15 PM
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Originally Posted by Jim_H
Y'all are much smarter about this than I but everything I have read has said the twin screw has lower discharge temperatures and less parasitic.
I hope this can stay educational as opposed to confrontational.
http://www.kennebell.net/techinfo/ge...romcatalog.pdf
I hope this can stay educational as opposed to confrontational.
http://www.kennebell.net/techinfo/ge...romcatalog.pdf
Last edited by Tim Murphy; 01-06-2013 at 10:04 PM.
07-21-2005, 07:16 PM
#96
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What Corky Bell book are you reading? Chapter 4 of Corky's book "Supercharged" where he discusses "The Balance of Heat" shows the centrifugal having a cooler discharge temperature than the twin screw in every reference he makes. Start on page 37 and you will see for yourself. Now, he said said it first, not me, so no lawsuits please.
Andy,
Not a simple choice.
The Screw compressor is a far better machine. It is the best supercharger, in my view.
The Centrifugal is far easier to install because the throttle body can remain in the stock place. The screw must have the throttle moved to the super inlet.
The screw makes more low end by far, produces less heat, and probably more durable.
I think the choice boils down to the abilities of the man building the components.
My choice, I'd do the extra work for the screw compressor.
Regards,
Corky
Andy Keel wrote:
Hello Corky,
Today's question is:
If you had the were to choose between a properly sized twin-screw system or a properly sized centrifugal system that shared similar intercooler and fuel system componets which would you choose? Assume that this is for a 3500lb street car that has a final drive ratio of 2.20, 2.54 (for automatic) or 2.73 (for manual).
Thanks,
Andy Keel
Supercharged928
---- Original Message -----
From: Corky Bell
To: Andy Keel
Sent: Thursday, December 02, 2004 3:48 PM
Subject: Re: askcorkybell.com question.
Hi Andy,
I've never seen a case of increased wear on the front bearing. Some engines with less than stout cranks have broken the front segment off ahead of the #1 bearing.
With a 928 and street level boost (less than 15), I would not be concerned about crank or bearing life due to the belt loads.
Regards,
Corky
Andy Keel wrote:
Hello Corky,
I was instructed to use this e-mail address as the website is down.
How common is excessive front crank bearing wear due to stress placed on the crank bearings by
a supercharger belt?
Thanks,
Andy Keel
Supercharged928
----- Original Message -----
From: Corky Bell
To: Andy Keel
Sent: Wednesday, June 16, 2004 9:03 AM
Subject: Re: askcorkybell.com question.
Hi Andy,
Nothing yet. I've not yet reached the one character I think knows the answer.
Regards,
Corky
Andy Keel wrote:
Hello Corky,
Any new thoughts or information on this?
Best Regards,
Andy Keel
----- Original Message -----
From: Corky Bell
To: Andy Keel
Sent: Wednesday, May 19, 2004 12:33 PM
Subject: Re: askcorkybell.com question.
Hi Andy,
Not too shabby for a question. I do not have an answer, but will attempt to tap some of my smarter buddies.
Remind me in about ten days that I owe you an answer.
Regards,
Corky
Andy Keel wrote:
Hello Corky,
In your book Supercharged! you have stated 1075 degrees F as an arbitrary absolute combustion chamber temp before onset of detonation, and that said temperature may vary significantly with, among other things, design of the combustion chamber.
Suppose a car has an alusil cylinder wall, cast aluminum pistons, hemispherical combustion chamber with plug at center and 4 valves evenly spaced, such as that of the Porsche 959.
Given these factors, how much higher is the absolute combustion chamber temp before onset of detonation likely to be?
Thank you,
Supercharged928
Andy Keel
Andy K
07-21-2005, 07:32 PM
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Now, he said said it first, not me, so no lawsuits please.
Are you asserting that I am or would sue you or anyone else or ever have?
Thanks,
Andy Keel
Last edited by GoRideSno; 07-21-2005 at 07:52 PM.
07-21-2005, 11:08 PM
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Originally Posted by GoRideSno
Tim,
What do you think a proper correction factor in GA in July would be?
Andy
What do you think a proper correction factor in GA in July would be?
Andy
Last edited by Tim Murphy; 07-22-2005 at 01:30 PM. Reason: spelling
07-21-2005, 11:11 PM
#100
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Originally Posted by GoRideSno
Tim,
Are you asserting that I am or would sue you or anyone else or ever have?
Thanks,
Andy Keel
Are you asserting that I am or would sue you or anyone else or ever have?
Thanks,
Andy Keel
You really want me to air your dirty laundry here? If so, you realize that you are giving me permission to post the PM's you have sent to me.
07-21-2005, 11:26 PM
#103
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Originally Posted by GoRideSno
It's not in his book. His book is old. But if you ask him here's what he'll tell you. This is several actual e-mails exchanged with Corky.
[COLOR=Blue]Andy,
Not a simple choice.
The Screw compressor is a far better machine. It is the best supercharger, in my view.
The Centrifugal is far easier to install because the throttle body can remain in the stock place. The screw must have the throttle moved to the super inlet.
The screw makes more low end by far, produces less heat, and probably more durable.
I think the choice boils down to the abilities of the man building the components.
My choice, I'd do the extra work for the screw compressor.
Regards,
Corky
Andy Keel wrote:
Hello Corky,
Today's question is:
If you had the were to choose between a properly sized twin-screw system or a properly sized centrifugal system that shared similar intercooler and fuel system componets which would you choose? Assume that this is for a 3500lb street car that has a final drive ratio of 2.20, 2.54 (for automatic) or 2.73 (for manual).
Thanks,
Andy Keel
Supercharged928
---- Original Message -----
From: Corky Bell
To: Andy Keel
Sent: Thursday, December 02, 2004 3:48 PM
Subject: Re: askcorkybell.com question.
Andy K
[COLOR=Blue]Andy,
Not a simple choice.
The Screw compressor is a far better machine. It is the best supercharger, in my view.
The Centrifugal is far easier to install because the throttle body can remain in the stock place. The screw must have the throttle moved to the super inlet.
The screw makes more low end by far, produces less heat, and probably more durable.
I think the choice boils down to the abilities of the man building the components.
My choice, I'd do the extra work for the screw compressor.
Regards,
Corky
Andy Keel wrote:
Hello Corky,
Today's question is:
If you had the were to choose between a properly sized twin-screw system or a properly sized centrifugal system that shared similar intercooler and fuel system componets which would you choose? Assume that this is for a 3500lb street car that has a final drive ratio of 2.20, 2.54 (for automatic) or 2.73 (for manual).
Thanks,
Andy Keel
Supercharged928
---- Original Message -----
From: Corky Bell
To: Andy Keel
Sent: Thursday, December 02, 2004 3:48 PM
Subject: Re: askcorkybell.com question.
Andy K
All I can say is that Lag would have a FIELD DAY with the information above. Too bad he has been told to sit in the corner for awhile.
Just curious, were you a customer of Corky's when you were asking him these questions? intercoolers, BEGI regulators??
07-21-2005, 11:30 PM
#104
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Yes but I have never dealt with him other than a few e-mails and never even mentioned in those what type of SC I even used. You don't exactly call up and order stuff from him. BTW I know you are a customer too so why the question?
Andy
Andy
07-21-2005, 11:46 PM
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What info? The bad links I posted? And why can't you say more? Perhaps Paul is the brains behind the Murph Kit? There is no doubt that all of you guys are smart and industrious but you sure are looking like fools here. This thread seem to slowly be twirling to the bottom of the toilet, again.
I'm willing to chip in part of the plane fare to fly you guys to a neutral spot so you can duke it out. The deal is you have to shake hands and be civil to each other after its over. And share all of your knowledge with the list.
I'm willing to chip in part of the plane fare to fly you guys to a neutral spot so you can duke it out. The deal is you have to shake hands and be civil to each other after its over. And share all of your knowledge with the list.
Originally Posted by Tim Murphy
Yes, I looked up when the book was published (2001) and your right, the material is dated.
All I can say is that Lag would have a FIELD DAY with the information above. Too bad he has been told to sit in the corner for awhile.
Just curious, were you a customer of Corky's when you were asking him these questions? intercoolers, BEGI regulators??
All I can say is that Lag would have a FIELD DAY with the information above. Too bad he has been told to sit in the corner for awhile.
Just curious, were you a customer of Corky's when you were asking him these questions? intercoolers, BEGI regulators??