Twin screw, or roots
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From: Huntsville, AL
Twin screw, or roots What is the better supercharger for a fully forged crate motor: a twin-screw, or roots? I know that the twin screw costs a little more, but is it worth it?
Even against the Eaton TVS 2.3? I know the smaller MP112 is nowhere near the Kenne Bell units, but how does the TVS stack up?
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From: Copenhagen
and to answer the question in the post: "What is the better supercharger for a fully forged crate motor: a twin-screw, or roots? "
the engine doesnt care it responds to boost, charge air temps, and parasitic load from the supercharger... the higher efficiency the blower the the colder the charge.. hence more atainable boost on a given fuel.. also the parasitic drag fo a roots is higher... and the charge is delivered in a pused manner.. so again more drag and less atainable boost before detonation...
if you can afford an intercooled screw type blower it will be a better setup if you are shooting for maximum HP.. if you arent pushing the envelope... then why get somthing expensive, that soomthing affordable can solve???
turbos have other pros and cons... and are supperior in some ways and perhape not as great in other compared to a positive displacement supercharger.. so do centrifugal superchargers...
find out what you want from the engine and stay true to it when you decide on what parts to get.. dont deviate from it once you start building.. and for gods sake, talk to a reputable shop when you have the money to spend
Last edited by deuce_454; Apr 27, 2009 at 03:14 AM.
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From: Newmarket, Ontario
Twin Screw ALL THE WAY! You get the benefits of a positive displacement pump with WAY more efficiency. A roots pump simply moves air, the twin screw moves air and actually compresses it in the lobes so that for the same flow and pressure you get a colder charge while using less hp from the crank to turn it.
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Jim
Last edited by DeltaT; Apr 28, 2009 at 11:48 AM. Reason: 1st answer didn't quote original fucked-up statement
I don't mean to beat this to death, but are you saying the TVS is more of a twin screw than a roots supercharger? Is there a thread on this somewhere?
I would love to get more information comparing, say, a Kenne Bell and a TVS?
I would love to get more information comparing, say, a Kenne Bell and a TVS?
I don't mean to beat this to death, but are you saying the TVS is more of a twin screw than a roots supercharger? Is there a thread on this somewhere?
Jim
Whipple has a kit for your truck:
And it looks like you'd get about 500ft/lb of torque from that 327:
Link at: http://www.whipplesuperchargers.com/...sp?ProdID=1136
Jim
And it looks like you'd get about 500ft/lb of torque from that 327:
Link at: http://www.whipplesuperchargers.com/...sp?ProdID=1136
Jim
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From: Copenhagen
im saying that its not a traditional roots compressor with straight vane rotors that deliver boost in a very pulsed manner... the high helix roots will deliver boost in a simmilar manner to the twinscrew.. the difference is that the roots compresses in the plenum and not internally... not sure how much teh engine cares about that though
Once the airstream goes through an under-blower intercooler, the pulsing is pretty much gone either way.
The Roots delivers boost by pumping more air into the plenum than the motor can handle, where the twinscrew does that as well, plus adds an internal compression cycle that makes it more efficient and able to maintain high levels of boost higher in the rpm range.
If cost is not the object, then the twinscrew will deliver more boost (approx 1.35 times more) from the same sized blower and add less heat than the Roots. A win-win.
Jim
The Roots delivers boost by pumping more air into the plenum than the motor can handle, where the twinscrew does that as well, plus adds an internal compression cycle that makes it more efficient and able to maintain high levels of boost higher in the rpm range.
If cost is not the object, then the twinscrew will deliver more boost (approx 1.35 times more) from the same sized blower and add less heat than the Roots. A win-win.
Jim
I am only speaking as how the whole "kit" works, the whipple kits I have seen are not even intercooled. I would take a intercooled roots setup over non-intercooled screw. It would be cool if the made some nice intercooled screw kits for the trucks. I think you would see a lot of the truck guys switching over when the seen the power they could be making over what they currently have.