Downpipes

[Matt Scicchitano]

>
> The shape of the downpipe is critical... bit hard to describe, but
the best
> is a "bell mouth" design, that is made of two separate tube sections
> "siamese" welded together that provide smooth duct-like exits for
both the
> turbo exhaust and wastegate. Between each of these "siamese ducts",
there
> should be a short "tang" extending into the union of the two ducts
and also
> extending iand butting into the wall of the turbo exhaust outlet...
the
> purpose of which is to provide extend the separation of the turbo
and
> wastegate exhaust flows further into the downpipe and away from the
turbo.


If I were to have another downpipe built again, I would incorporate a
seperate pipe for the wastegate as you mentioned, but have it simply
point to the ground and not meet back up with the exhaust at all. A
bit loud( when the wastegate is open) and illegal, but no disturbance
to the primary exhaust at all, technically more area for the primary
exhaust to flow through, and cheaper.

-Matt


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[JohnnyG]

Well, a compromise would be better for street use... with the waste gate
having a seperate pipe joining after at the rear of the dump pipe.

John Gillon

----- Original Message -----
From: Matt Scicchitano <nzwrc1@sunlink.net>
To: <BC-BFLegacyWorks@egroups.com>
Sent: Friday, November 24, 2000 37 AM
Subject: [BC-BFLegacyWorks] Re: Downpipes


>
> >
> > The shape of the downpipe is critical... bit hard to describe, but
> the best
> > is a "bell mouth" design, that is made of two separate tube sections
> > "siamese" welded together that provide smooth duct-like exits for
> both the
> > turbo exhaust and wastegate. Between each of these "siamese ducts",
> there
> > should be a short "tang" extending into the union of the two ducts >
> If I were to have another downpipe built again, I would incorporate a
> seperate pipe for the wastegate as you mentioned, but have it simply
> point to the ground and not meet back up with the exhaust at all. A
> bit loud( when the wastegate is open) and illegal, but no disturbance
> to the primary exhaust at all, technically more area for the primary
> exhaust to flow through, and cheaper.
>
> -Matt
>
>
>
> To unsubscribe from this group, send an email to:
> BC-BFLegacyWorks-unsubscribe@egroups.com
>
>
>
>


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