Crooked carb diffuser?

hi again...well if it was me for $200 or $20 I would make a claim if it is a manufacturing flaw or wrong part installed.  It is the only way that records of the defect will be noted at the factory side and assigns a priority to looking into a solution so it will not happen again.  I know it is a lot of paperwork but nothing more than reading all this thread from top to bottom would take in my view.  I would encourage you to follow up and take the time to fill in a report to get it at the very least documented at the factory.  it is never too late to fill in a full CSIR, customer service information report, and submit one.  It is also important to tie this to an engine serial number so that engines in that range will be noted should yours not be an isolated case.  

Cheers

I think we have a disconnect here.  I DID fill in the CSIR for the carb piston... I just didn't pursue a warranty claim.  I spent some time on the phone with my iSC, who viewed the CSIR, and they felt a claim would not be worth the trouble for a $200 part.  I had owned the engine more than three years when I discovered the problem, on the second carb inspection (the first one was not done by me), so that might have entered into their calculus, idk.

If we are talking about the diffuser issue, I'm not going to take the carb off and all apart again just to get photos with which to make a new CSIR, since I haven't noticed any major issue from that.  When it comes time to send out the carbs for a 600h overhaul (probably at the end of next summer) I'll ask the shop if they can do something about the diffuser at that time.  I had previously been told by an iSC that the only way to fix that issue was with a whole new carb...

Mike and Roger,

Apologies for the late reply. To be honest the forum confuses me a little because the replies don't seem to move the topic to the top of the list so I don't know if someone posted something on it (maybe there is a way to change that through settings).

First the easy answer, my prop is a three blade DUC. Blade pitch checked to be exact on all three. Prop and spinner dynamically balanced. But very good point to check prop first.

Regarding the Europa, mine also shakes at a relatively low frequency between 2500-3500 RPM. I just don't linger on that range. I was told that can be caused by the unloading of the gearbox caused by the windmilling prop. Not 100% sure but I don't think I feel it on the ground.

I also have a peak at 43 Hz at 5200 engine RPM. In my case you can see that little 1.2 per peak (carb balance) being very small at other engine RPM and then shoots up at 43 Hz when the engine gets to 5200 RPM telling me that there is something resonating at that frequency (in the engine or airframe) and it peaks when it gets excited . 

I concur with you on the Europa engine mount design. And same problem here, I hate the sound at higher RPMs. I say the engine is "screaming"! By new Bose A20 doesn't do much to help, in fact, it makes the screaming more noticeable. My theory is that it is the engine mount, a hundred thingies in the airplane with different vibration modes and it is possible that since the engine mount is attached to the central "tunnel" in the cockpit it acts as a horn that amplifies the engine sound.

Best,

Chris

If you click the Discover button, and select Recent Topics, it should show you everything that's been recently replied to, in order of newest reply.

That  worked ?. Thanks.

Chris