[Rovernet] 3500S exhaust?

[Michael Pellow]

To add to Pierre's comment, there configuration for the S (manual shift) 
exhausts is different .The Auto pipes meet under the gearbox just behind 
the  torque converter where one side curves around and join in a narrow 
Y to run down the L H side of the auto to the back of the car.The 
manual,however, run back each side of the gearbox in a Y shape to  join 
at the back by the drive shaft connection ,all are a bigger bore about 
1/2 to 3/4 inch to 2 inches .One of the members of our club bought a 
hotted up car that had a much bigger exhaust.He took it off as if made 
no improvement and made the car extremely noisy at motorway speeds it 
droned .reducing the bore back to the S spec shut it up .

On 30/11/2016 5:00 a.m., Geoff McCarthy via Rovernet wrote:
> 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)
>>
>>
>>
>> -------------- next part -------------- An HTML attachment was
>> scrubbed...
>> URL:
>> <http://rovernet.org/pipermail/rovernet_rovernet.org/attachments/20161
>> 121/52
>> 6ae913/attachment.html>
>> _______________________________________________
>> Rovernet mailing list
>> Rovernet at rovernet.org
>> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>>
>>
>> _______________________________________________
>> Rovernet mailing list
>> Rovernet at rovernet.org
>> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>>
>
>
> _______________________________________________
> Rovernet mailing list
> Rovernet at rovernet.org
> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL:
> <http://rovernet.org/pipermail/rovernet_rovernet.org/attachments/20161129/85
> 606172/attachment.html>
> _______________________________________________
> Rovernet mailing list
> Rovernet at rovernet.org
> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>
>
> _______________________________________________
> Rovernet mailing list
> Rovernet at rovernet.org
> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>