Re: Blower Size On Smallblock??
[Re: Slingshot383]
#1629405
06/10/14 02:45 PM
06/10/14 02:45 PM
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Joined: May 2011
Posts: 4,492 northern,Ohio,USA
Clanton
master
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master
Joined: May 2011
Posts: 4,492
northern,Ohio,USA
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Quote:
Clanton, in his second post, he said he had a bird for the roots blower, that's where I got it from.
OK then.
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Re: Blower Size On Smallblock??
[Re: Blucuda413]
#1629409
06/11/14 06:20 PM
06/11/14 06:20 PM
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Joined: Jun 2010
Posts: 462 Stockholm, Sweden
fed
mopar
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mopar
Joined: Jun 2010
Posts: 462
Stockholm, Sweden
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How do you modifie the tunnelram for the blower? I have a 6-71 and a Holley Pro dominator intake that i would like to use on my 340.It made 640HP on the dyno with a singleplane and a dominator. Any pics on an tunnelram/blower intake?
Cuda, -70 Valiant-65 AWB, Valiant Signet200 -65 Topchopped dragcar. Topolino Fuel Altered. NostalgiaFED Sold, SuperComp Bantam Altered, Sold Ex Harlan Thompsons Nitro funny car American Graffiti Sold,
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Re: Blower Size On Smallblock??
[Re: Blucuda413]
#1629414
06/12/14 01:04 PM
06/12/14 01:04 PM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,219
New York
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There's another intangible factor involved that I didn't address. GMC etc. blowers do not actually compress the charge internally, all boost occurs when the engine's capacity is fully satisfied (manifold vacuum is zero) - boost is pressure against the previous intake cycle. If the blower is too small or spun too slowly not only is boost = zero, you will have big pumping loss and vacuum @ WOT: negative horsepower. This means that the time to develop pressure is somewhat affected by plenum volume - more storage = slower to pressurize. Regarding discharge port location, it's not clear in my remarks. Any straight rotor should just have the window (more or less) centered over the plenum like dual carbs. Any helix rotor will tend to charge nearest the front, even if the port window is rectangular. I have a gut feeling that some running older helix blowers with square windows have plated the windows into triangles to reduce charge temp and improve mix distribution, but they're not talking about it!
Boffin Emeritus
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