Willie and all,
What I surmise is that the alignment of the muffler is the culprit.
Since the #s 1 & 3 are catty-cornered from each other and neither has an
adjustable link, one tends to stand off the muffler if the #1 pipe is
not perfectly adjusted. This situation is what caused the exhaust leak
on Baby Blue, which ultimately overheated the ignition coils and caused
the rough running incident I encountered.
What I see happening is this: The ball end of the pipe is not fully
seated into the muffler, allowing the pipe to vibrate and setting up a
resonation which ultimately leads to the cracks. I may be totally off
base, here, but it makes sense to me...
Jeff - Baby Blue
William Harrison wrote:
> <willie.harrison@tinyonline.co.uk>
>
> Same on mine (front left) at approx 100 hrs.
>
> Can anyone shed light on another exhaust problem - an allegedly bad
> batch of springs (too long, so silencer is not held on securely enough)?
>
> Willie
>
>
> On 24 Oct 2008, at 17:35, Steven Pitt wrote:
>
>> Remi,
>> The front port pipe on my 912S engine had the pipe and bell fitting
>> (the flange that is bolted onto the engine) come apart at the weld
>> (see picture as this explains better than my words). I realised I had
>> a problem when taking off and I heard a noise that I had not heard
>> before. The pipe was able to rattle in the flange fitting but did not
>> fall off and was only observed once the engine cooled and I was able
>> to grab the pipes and shake them.
>> I did not loose power but aborted the take off due to the change in
>> noise.
>> The engine has done 120 hours.
>> Hope this helps.
>> Regards
>> Steve Pitt
>> G-SMDH
>> DSCN1604
>>
>> <DSCN1604.JPG>
>
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