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#1
10-10-2010, 10:22 AM
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3" mandrel-bent downpipe for 2.5" RA manifolds
I saw Paul at RARE is producting these. Looks interesting. Anyone tried them yet?
http://www.ramairrestoration.com/cat...roducts_id=302 |
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#2
10-10-2010, 11:29 AM
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With the restriction of the smaller than 2.5" RAIII outlet and on the neck of the downpipe, I wonder what's the use?
__________________
 frittering and wasting the hours in an off hand way.... 1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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#3
10-10-2010, 11:31 AM
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That's what I'm wondering too. Could it act as a venturi?
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#4
10-15-2010, 02:28 PM
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Even though the restriction is 2.5", there is a certain resistance to flow along the walls of a tube. So - a 3" pipe will flow better even though it starts out at 2.5".
I think it's a good idea!
__________________
Regards, "455HO" Lloyd 2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98 
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#5
10-15-2010, 03:57 PM
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big is good..back pressure is bad..
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#6
10-21-2010, 04:16 PM
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I had an issue with my RARE 2.5 manifolds sealing on their down pipes. There isn't alot of meat there to seal it.
From what I remember on some of the cross sections of the manifolds some are pretty small in the area where they all merge.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#7
02-04-2011, 02:10 AM
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I'd wanna see a set actually on a car before I'd comment or buy.
I know this,on my '72 firebird,I've been working on my "odd-ball" exhaust system,and I gotta say it's hard to make that sorta undercar turn with a full 3" pipe. I had to use the tightest radius mandrel bend I could find (3"pipe/3"radius),and even that is'nt putting things exactly where I'd like them to be. But I kinda knew it would be a challenge,as I'm working with the Hedman shorties and the F-M crossflow system,so I gotta account for the header collector in all that too. Was hoping it all would tuck up under there a little better really,but I'm not done just yet,I may still make some adjustments and see if I can get it all in there a little better. But by doing that deal I can figure that these will likely take up a bit more room than some would expect,especially if the car is lowered or such. Bret P. |
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