> Why is the stock and performance RX8 exhaust manifolds welded on the
> outside?  Karibian
>
> Good question. No where near as durable as welding them
> on the inside.
>
> Paul Lamar

Hi Paul;
I believe this one is still up for debate.
I believe a lot of racing exhausts are done from the inside because it
is easier for people and machines.
In this case, I see a failure right at the edge of a thick weld
(hardpoint), stress riser(both material and thermal).
I would also have a few tacks on the outside and a 'cooling' enclosure
with airflow.
Cheers
Cary



The OBX  RX8 exhaust maifolds  on Ebay are all welded on the outside.

I forgot to add that my homemade exhaust on my Lyc O-320 is welded
on the inside and hasn't cracked yet. (Only 300 hours)

Karibian

If the RX8 tubes  only over hang a few inches the load on the joint is
less. Might be OK but why take a chance?

Paul Lamar ...No rotor no motor.

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