[Healeys] Downpipes

[Alan Seigrist]

Bob -

The flexpipe is there specifically because prior to 1953 or so, many
English cars had their exhaust systems bolted to the frame of the car, so
the flexpipe was needed to account for the lateral movement of the motor.
The flexpipe also made installation easier.  On my A90 I had to craft  its
own exhaust mount system, which works well.  Definitely no need for it if
the pipes are custom fit.  I think in the case of the healey, they kept the
flexpipe to allow for some give in installing mass produced pipes with
varying tolerances.

Cheers,

Alan

On Thu, Sep 19, 2024 at 11:44 AM Bob Spidell via Healeys <
healeys at autox.team.net> wrote:

> Listers,
>
> The exhaust downpipes for both 4- and 6-cyl cars have a section of
> flexible tubing before the connection to the muffler. I've always
> assumed this was to allow for the rocking of the engine, and the fact
> the system is affixed with fairly rigid hangers (at least, until the
> rubber part disintegrates). I've also heard the flexpipe is to allow
> easier fitment from the downpipe to the muffler, which won't necessarily
> be perfectly aligned. Of course, both reasons could be true.
>
> I'm asking the knowledge-based, LLM model List because I'm considering
> an aftermarket header from AH Spares for my BN2/100M. The repop down
> pipe I have now is malformed, and the clutch pedal arm comes in contact
> with it at full clutch pedal, and I've heard this is common in the
> repops (yes, I could just bash the downpipe, but that would be tacky and
> sometimes that can cause a ticking noise, which would annoy me even
> more). But, the AHS pipe doesn't have the section of flexpipe so I'm
> wondering if it's really needed. I have a TIG and I'm not terrible with
> it, but the header and, presumably the flex tubing are SS, which I'm not
> practiced in welding.
>
> Thanks for any suggestions.
>
> Bob
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