[V8] Exhaust

Sean spcole at mn.rr.com
Sun May 13 01:32:02 EDT 2007

Guys and gals,

All great comments and I do understand the effect of the x-over pipe.  I 
also under stand fluid dynamics and the steep angles on the "stock:" 
x-over pipe are bad for flow/power.  I am not looking to delete, but 
improve the x-over pipe.  by reduce the angle of the incoming air you 
reduce back pressure and flow more exhaust gas.  The key with exhaust 
tuning is to keep velocity up till it's at least 3 feet away from the 
port.  That isn't that far in tubing, but still the "stock" unit is 
restrictive.  I am also looking to max out what the ecu can do before I 
need a chip, then chip it or just 5-speed the thing and run Standalone.

91 CQ getting built 4.2L, 6-speed Diesel transmission, 4-pot brakes all 
around and tuned suspension
90 V8q better then stock
58 Chevy 1/2 ton pickup with 348 tri power, "The rubber eater"

v8-request at audifans.com wrote:

> Message: 6 Date: Sat, 12 May 2007 16:06:13 -0400From: cobram at juno.com 
> Subject: Re: [V8] Exhaust To: jward.v8 at gmail.com Cc: V8 at audifans.com 
> Message-ID: <20070512.160613.4856.2.Cobram at juno.com> Content-Type: 
> text/plain; charset=us-ascii "Jeremy Ward" <jward.v8 at gmail.com> writes:

>>>> One thing to keep in mind is that the X-pipe is intended to help 
>>>> with scavenging; as the exhaust from one bank of calendars blows
>> through
>>>> the x-pipe, it creates a siphon effect to help pull exhaust gases from 
>>>> the other cylinder bank.
>> Excellent point, a definite detriment to performance, as anyone who's 
>> ever been clueless enough to remove a crossover from a motorcycle and 
>> run straight pipe to the mufflers can attest to. "cough" BCNU, 
>> http://www.geocities.com/cobramsri/ Some days you're the dog, some 
>> days you're the hydrant
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