[Rovernet] 3500S exhaust?

[Geoff McCarthy]

Pierre, would you know if a set of the large bore manifolds are available?

Geoffrey W. McCarthy MD MBA DipAvMed
677 NW Melinda Ave
Portland OR 97210
503-241-8468 (h)
503-799-3809 (m)

-----Original Message-----
From: Rovernet [mailto:rovernet-bounces at rovernet.org] On Behalf Of pierre
janusz via Rovernet
Sent: Tuesday, November 29, 2016 12:42 AM
To: rovernet at rovernet.org
Cc: pierre janusz <pjemail at aol.com>
Subject: Re: [Rovernet] 3500S exhaust?

Dear Kent,


I am afraid that your information about the exhaust systems on the P6B is
incorrect. All 3500S manuals, manufactured from late 1971, have large bore
exhaust systems. This means larger exhaust manifolds (headers) and larger
bore pipes all the way through. The narrow bore pipes do not mate up with
these manifolds properly, but you might get a seal with a bit of luck and
some sealing compound. All V8 models (manual and auto) from late 1973 to the
end of production had wide bore systems, but the autos retained the narrow
bore manifolds and the downpipes expanded a little under the fitting
flanges. 


Pierre



-----Original Message-----
From: Kent Kinard via Rovernet <rovernet at rovernet.org>
To: Rovernet <rovernet at rovernet.org>
CC: Kent Kinard <kkinard at att.net>
Sent: Tue, 29 Nov 2016 4:42
Subject: Re: [Rovernet] 3500S exhaust?

Geoff and Gross,
I sense some confusion here.  The "big bore exhaust" on UK spec 3500S models
(with four speed transmission), refers only to the exhaust manifolds used on
those engines.  The exhaust pipes are of the same diameter as those used on
automatics, but are of a different configuration.  The tailpipes and boxes
are the same. The "big bore manifolds" differ from the automatic manifolds
in two respects, both of which are advantageous.  They 1) are smooth on the
outside with no provision for heated intake "stoves" and (2) have a larger
internal cross section just above the outlet flange (though the actual
outlet diameter is the same).  The smooth exterior and added inside diameter
just above the outlet flange help to avoid cracking. The casting also
appears to be thicker.  Automatic transmission exhaust pipes will mate to
these stick shift manifolds without modification.  The performance advantage
of these manifolds is minimal but they are much more durable.  
I have had two sets but no longer have either.  I do not believe that larger
diameter pipes were a factory fitment.

Roverperhapstooexhaustively,
Kent K.

Scruggs Family via Rovernet wrote:
> Geoff,
>
> My 3500S has the 'bit bore' exhaust system but as it was installed 
> when I took possession of the car in '84 I can't offer a before/after
comparison.
> I bought my system from the since demised Rovers West.  I've seen ads 
> in a Brit magazine for stainless steel big bore exhaust systems, 
> Falcon, I think was the brand, but that was years ago.
>
> I have a new yet-to-be-installed factory big bore system for my '67 
> 2000TC that I intend to coat with a thermal barrier coating and am 
> looking forward to the difference.
>
> A good exhaust shop should be able to replicate a system of any 
> diameter for your needs.
>
> Gross Scruggs
> Annapolis MD
>
>
> -----Original Message-----
> From: Rovernet [mailto:rovernet-bounces at rovernet.org] On Behalf Of 
> Geoff McCarthy via Rovernet
> Sent: Monday, November 21, 2016 10:49 AM
> To: 'Rovernet'
> Cc: Geoff McCarthy
> Subject: [Rovernet] 3500S exhaust?
>
> Kent Kinard told me that the UK spec, manual transmission cars had a 
> bigger exhaust system.  Any for sale out there?  Or, anyone with 
> experience of headers on a 3500S?  thanks.
>
>   
>
> Geoffrey W. McCarthy MD MBA DipAvMed
>
> 677 NW Melinda Ave
>
> Portland OR 97210
>
> 503-241-8468 (h)
>
> 503-799-3809 (m)
>
>  
>
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