[Rovernet] 3500S exhaust?

Kent Kinard kkinard at att.net
Tue Nov 29 08:22:10 EST 2016


Thank you, Pierre.  Since I no longer have the parts in question, I was 
going from memory...which is failing more each day. -Kent K.

pierre janusz via Rovernet wrote:
> 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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