Twin Screw's and Root's Blowers
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From: Coppell,TX
Twin Screw's and Root's Blowers I'm looking at possible combo's for a 67' Camaro. I like the looks of a twin screw and roots type blower but what are the tradeoffs im facing? The objective is about 800rwhp on good gas and a pulley change with 600 or so on the street on 93 octane. Hood Clearence is a non-issue. What are the root and twin screw style blowers that are availiable for the LS1?
408 at 8.5:1 Compression, Max psi of 24, low boost of 12 for street.
408 at 8.5:1 Compression, Max psi of 24, low boost of 12 for street.
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The main problem on an Fbody with a positive displacement supercharger is FITMENT.
And if you truly want a positve displacement... wait a year or possibly longer till they hit aftermarket.. you'll like the new offerings... lets put it that way.
And yes, you will be able to hit 800+hp Although the stuff on the market now i dont believe will achieve that easliy... (positive displacement that is)
And if you truly want a positve displacement... wait a year or possibly longer till they hit aftermarket.. you'll like the new offerings... lets put it that way.
And yes, you will be able to hit 800+hp Although the stuff on the market now i dont believe will achieve that easliy... (positive displacement that is)
Last edited by H8 LUZN; Feb 19, 2006 at 01:09 PM.
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From: Down Under
Originally Posted by Spenser309
This is a 1967 Camaro, there is no cowl area.
Anyhow, i would suggest waiting if you want max efficiency. Screw compressors start to reach the point of diminishing returns at above 550 or so hp.
The current roots will not be able to reach your boost pressure either... another good reason
If you want to reach that level and cannot wait... i suggest a centrifigal type or turbo for max efficency.
For example the S2300 (ford GT) is close to the performance numberst to the S3300 even though its 1000cc/rev larger but has to spin slower due to the large size. Therefore anything over 600-650hp would be pushing it for the screw type and put them out of their efficiency range. (not saying it cant be done.. just saying its not optimal)
Last edited by H8 LUZN; Feb 19, 2006 at 10:18 PM.
Get Corky Bell's book "Supercharged!". It talks about centrifugal, twin-screw and roots blowers in detail. You will learn the pluses and minuses of each, and they all have advantages/disadvantages. This book helped me build my blown 383 and get what I wanted out of it. Will pay for itself, at $20.
Jim
Jim
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From: Down Under
Originally Posted by DeltaT
Get Corky Bell's book "Supercharged!". It talks about centrifugal, twin-screw and roots blowers in detail. You will learn the pluses and minuses of each, and they all have advantages/disadvantages. This book helped me build my blown 383 and get what I wanted out of it. Will pay for itself, at $20.
Jim
Jim
Yes, i suggest anyone who is looking into buying a supercharger learn and read as much about the different options. There are trade offs with each.
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From: England
Originally Posted by Spenser309
I'm looking at possible combo's for a 67' Camaro. I like the looks of a twin screw and roots type blower but what are the tradeoffs im facing? The objective is about 800rwhp on good gas and a pulley change with 600 or so on the street on 93 octane. Hood Clearence is a non-issue. What are the root and twin screw style blowers that are availiable for the LS1?
408 at 8.5:1 Compression, Max psi of 24, low boost of 12 for street.
408 at 8.5:1 Compression, Max psi of 24, low boost of 12 for street.
A twin screw can do this, but you'll need to get a blower big enough, I think the Vette kit from Kennebell (www.kennebell.net) uses a 2.4 twin screw, this will make it into the ball park area you are talking about but it will be pushing quite hard. But PEAK numbers arn't always everything, if you want low end grunt and instance response then a PD blower maybe the way to go.
A Centrifugal has the ability to do this, but it's all revs by comparison to a PD blower, so it may be better at the track but perhaphs slightly different on the street.
Or as others have mentioned a turbo setup.
It's the size of these style blowers that is limiting them... They could, theoretically, just make them bigger... not that they'd fit in a normal car, though. Thus, the appeal of centrifugal superchargers for 600+ whp street, or at least street-ish, cars.
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From: England
Yeah Whipple sell a 3.3 twin screw for the LS1. This should be a sensible option if hood clearance isn't an issue (oh and money).
http://www.whipplesuperchargers.com/...sp?ProdID=1230
http://www.whipplesuperchargers.com/...sp?ProdID=1230
or does it... 
ive been thinking about this for a while. with a 224/228 cam and 5-7spi of boost, a roots or twin screw blower will have retarded amounts of power down low. it should also peak around 475rwhp, add a nice 150 shot and theres your 600rwhp...
i've already got the nitrous systems lol
i've already got the nitrous systems lol