Ae our blowers really overspun from the factory?
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From: The People's Republic of Los Angeles
Originally posted by PWR_WHLS
Nice write up of info.
So we leave the interesting question of 'how much sooner?' does the roots kick in compared to the screw - specifically on our application?
john
Nice write up of info.
So we leave the interesting question of 'how much sooner?' does the roots kick in compared to the screw - specifically on our application?
john
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From: The People's Republic of Los Angeles
Originally posted by Flying ****
I refuse to look at any chart with the words KenneBell printed across the top.
I refuse to look at any chart with the words KenneBell printed across the top.
2. I was referring to the second chart.
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From: DETROIT, (formerly Eaton County, Michigan)
Tim, don't you still have the EATON on your truck, but you say that it is overspun from the factory?
If that is true, why didn't you upgrade superchargers?
Do you have an oversized Crank Pulley turning your Eaton or are you pushing 8# stock?
I think you argument would have more bite if you weren't running the eaton.
If that is true, why didn't you upgrade superchargers?
Do you have an oversized Crank Pulley turning your Eaton or are you pushing 8# stock?
I think you argument would have more bite if you weren't running the eaton.
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From: The People's Republic of Los Angeles
Originally posted by l-menace
Tim, don't you still have the EATON on your truck, but you say that it is overspun from the factory?
If that is true, why didn't you upgrade superchargers?
Do you have an oversized Crank Pulley turning your Eaton or are you pushing 8# stock?
I think you argument would have more bite if you weren't running the eaton.
Tim, don't you still have the EATON on your truck, but you say that it is overspun from the factory?
If that is true, why didn't you upgrade superchargers?
Do you have an oversized Crank Pulley turning your Eaton or are you pushing 8# stock?
I think you argument would have more bite if you weren't running the eaton.
I still have a bone stock engine (which actually consistently makes 10.5 PSIG). No pulleys.
Why don't I upgrade the supercharger? 1. Money. I have more in suspension and brake upgrades than most have in engine mods. 2. Warranty. My truck is only a year-and-a-half old. 3. My client is ProCharger. I may try out a centrifugal.
But none of the above has anything to do with the subject at hand. The stock blower is at the outer edges of or beyond its efficient range. A twin screw is demonstrably superior to a roots in virtually every objective aspect. What blower I have (or even if I have a blower) does not change these results. You do not need to trust me; the data is out there and it's clear.
Last edited by Tim Skelton; Sep 9, 2003 at 10:46 AM.
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Originally posted by Tim Skelton
But none of the above has anything to do with the subject at hand. The stock blower is at the outer edges of or beyond its efficient range. A twin screw is demonstrably superior to a roots in virtually every objective aspect. What blower I have (or even if I have a blower) does not change these results. You do not need to trust me; the data is out there and it's clear.
But none of the above has anything to do with the subject at hand. The stock blower is at the outer edges of or beyond its efficient range. A twin screw is demonstrably superior to a roots in virtually every objective aspect. What blower I have (or even if I have a blower) does not change these results. You do not need to trust me; the data is out there and it's clear.
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From: Plainfield, Illinois
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From: Ohio
That is a nice little diagram. Roots technology has limitations, I can't see how anyone can dispute that.
The Roots benefits are possibly the more turbulent air flow along the outside of the rotors at low RPM's that may yield better low (<2000 engine rpm) torque. Also a proven history and current tooling in place to make these blowers cheaply.
The Twin Screw benefits are the heat efficiency at higher boost levels. They simply make less heat at high boost, and can out flow the Eatons at a given boost level...plain and simple.
The only holdback as I see it is going beyond 500rwhp with the stock rods in our engines. The Eaton motors can approach this with a proper tune, moderate boost levels, e-fan, long tubes and maybe some porting.
Therefore, IMHO the KB is probably better suited for a built L motor or the tougher Cobra engine.
The Roots benefits are possibly the more turbulent air flow along the outside of the rotors at low RPM's that may yield better low (<2000 engine rpm) torque. Also a proven history and current tooling in place to make these blowers cheaply.
The Twin Screw benefits are the heat efficiency at higher boost levels. They simply make less heat at high boost, and can out flow the Eatons at a given boost level...plain and simple.
The only holdback as I see it is going beyond 500rwhp with the stock rods in our engines. The Eaton motors can approach this with a proper tune, moderate boost levels, e-fan, long tubes and maybe some porting.
Therefore, IMHO the KB is probably better suited for a built L motor or the tougher Cobra engine.
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Originally posted by TiresWinRaces
That is a nice little diagram. Roots technology has limitations, I can't see how anyone can dispute that.
The Roots benefits are possibly the more turbulent air flow along the outside of the rotors at low RPM's that may yield better low (<2000 engine rpm) torque. Also a proven history and current tooling in place to make these blowers cheaply.
The Twin Screw benefits are the heat efficiency at higher boost levels. They simply make less heat at high boost, and can out flow the Eatons at a given boost level...plain and simple.
The only holdback as I see it is going beyond 500rwhp with the stock rods in our engines. The Eaton motors can approach this with a proper tune, moderate boost levels, e-fan, long tubes and maybe some porting.
Therefore, IMHO the KB is probably better suited for a built L motor or the tougher Cobra engine.
That is a nice little diagram. Roots technology has limitations, I can't see how anyone can dispute that.
The Roots benefits are possibly the more turbulent air flow along the outside of the rotors at low RPM's that may yield better low (<2000 engine rpm) torque. Also a proven history and current tooling in place to make these blowers cheaply.
The Twin Screw benefits are the heat efficiency at higher boost levels. They simply make less heat at high boost, and can out flow the Eatons at a given boost level...plain and simple.
The only holdback as I see it is going beyond 500rwhp with the stock rods in our engines. The Eaton motors can approach this with a proper tune, moderate boost levels, e-fan, long tubes and maybe some porting.
Therefore, IMHO the KB is probably better suited for a built L motor or the tougher Cobra engine.
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From: Nashville
Originally posted by eatoncharged
Do you know this from experience or did you just re-write everything everyone said from all the above posts? This subject gets old. I know from personal experience that the screw blowers are unreliable at least in my opinion. I know and was there at the time when two Whipples exploded. Two times for one and three for the other. Don't even get me started on the Kenne Bells. The main advantage that a screw has is where the roots runs out of steam. Most of you guys think that a screw is better because Kenne Bell did a test on it. I would be willing to bet that the horsepower they gained was due to the larger supercharger. In order to do any real comparison you would have to use the same size blowers etc.
Do you know this from experience or did you just re-write everything everyone said from all the above posts? This subject gets old. I know from personal experience that the screw blowers are unreliable at least in my opinion. I know and was there at the time when two Whipples exploded. Two times for one and three for the other. Don't even get me started on the Kenne Bells. The main advantage that a screw has is where the roots runs out of steam. Most of you guys think that a screw is better because Kenne Bell did a test on it. I would be willing to bet that the horsepower they gained was due to the larger supercharger. In order to do any real comparison you would have to use the same size blowers etc.
1. My KB allows me to make more power than the biggest roots currently available for my truck.
2. I have had my KB installed on my truck for around 17K miles. I haven't had to send it back for repair. It isn't making strange noises. I was one of the first group to get them back in late march/ early April. I have changed the oil once so far and am almost due for another oil change. The oil was clean on the first change. It doesn't spit oil. The blower has been spun much more than what it is rated for. I have run the blower most of its life with 20-22 psi worth of pullies. That is pretty good IMO. My stock roots blower didn't last that long and the bearings in the nose were toast when I gave it away.
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I agree that the screw design is better at higher boost levels like what you are doing, but for me, I will never/can never run that much boost on the street. I think that most people couldn't do anything like that either.