[Rovernet] 3500S exhaust?

Brian srewosnairb at comcast.net
Sat Dec 3 12:43:41 EST 2016


Scott
Try this company. They produce Spec'd stainless exhaust for Rovers, all bolt together with hangers as to OEM.
http://www.doublesexhaust.com/
I bought a complete pipe set for my 67 2000TC

Brian

> On Nov 28, 2016, at 8:41 PM, Kent Kinard via Rovernet <rovernet at rovernet.org> wrote:
> 
> 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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