I agree with you but I would rather put the 2.5 down pipes into a flowmaster 2
into 1 with 3" out and go 3" all the way.
Colin H.
Bridges, Bruce wrote:
> Colin,
> Just remember that if the entrance condition is designed improperly, you can
> effectively reduce the diameter of the pipe to a smaller dia than the actual
> inlet. ie: if you take a 2.5" pipe and dump it onto the 2" cat inlet, you
> have effectively created a cat inlet that is smaller than the 2" due to the
> entrance effects. You need a long blend or radius that is R/D .2 or less
> (0.5"radius or bigger for 2.5"pipe, not much room for that..) to actually
> get better flow than 2" pipes with a smooth inlet transistion. Fluids, what
> a wonderful, semi predictable thing..
>
> ______2.5"____ cat
> ________
> separation zone, no flow
> ===========
> ===========flow zone (soda straw time)
> separation zone, no flow
> _________
> _____________
>
> (sorry Sam, my ASCII attempt, not so good...) separation @ the sharp edged
> inlet will "neck" the Cat inlet to a substatially smaller inlet than the
> actual 1 7/8" see fig 10-12 of Engineering Fluid Mechanics,
> Roberson/Crowe...
>
> -----Original Message-----
> From: Vincent Heckathorn [mailto:victorylane@iwaynet.net]
> Sent: Thursday, October 29, 1998 9:24 PM
> To: dakota-truck@buffnet.net
> Subject: Re: DML: ORDER THEM HEADPIPES!!
>
> For $200 I sure as hell can get a set of 2.5 pipes bent up locally and have
> them
> coated as well. I don't see a 2" pipe worth the effort of changing.
> Colin H.
>
> CHARLESK-RUSTON@worldnet.att.net wrote:
>
> > At about 2:00 pm PST talked to guy at JBA. Ordered the headpipes for my
> R/T.
> > There guy said the pipes will be 2", instead 2 and 1/4 we wanted, bummer.
> He
> > said they would be worth about 5hp but make the headers work better, what
> ever
> > that is suppose to mean. I ordered the ceramic coated ones. Cost is $200
> like
> > Bruce said. Shipping to Tacoma, Wa. is about $20 UPS. He also said they
> need 20
> > orders before they get going on this. I was #7, so come on you all call
> JBA and
> > order them pipes!! He was saying they hoped to ship before X-mas. Also he
> said
> > they should have dyno results in about 2 weeks on the JBA web page I
> guess. Hope
> > this info is of use to the rest of you.
> >
> > Terry Knapp
> >
> ----------------------------------------------------------------------------
> ----
> > (__) ,---------. NOTE: The preceding message was sent via Jaek
> and
> > (oo) | :\/: _ _ \ Jon's WWW mail cow gateway. That is to say,
> the
> > /-------\/_/ : :: :: : ) person who sent this message could in fact be
> an
> > / | MAIL|| \_ ' '`-'`-'/ anonymous prankster. Even though this message
> was
> > * ||"" || \__________/ mailed to you from the cs.fredonia.edu domain,
> it
> > ^^ ^^ could have been generated by anyone in the
> world.
> > Please keep this in mind. Thank you! --Jaek (smit2204) and -Jon-
> (stei0302)
> >
> ----------------------------------------------------------------------------
> ----
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