Re: Flight report

Frankenbird Vern

  The Zenith/Corvair folks had a rebuilder that mistakenly installed too large of jets in the MA3SPA and there was a recall of the carbs thus jetted in order to correct the very same issues you describe Mike. 

 You can easily research the issue on this Safety Alert here:

 It could be possible that your carb may have been jetted in this same manner. The same consumption is correct for the 0-200 as up to the 3.3L Corvair. Your engines symptoms indicate this is the case. I would say that William would be more than willing to indicate the revise jet size and from there you can verify what your SPA has installed now. 

From: Q-LIST@... on behalf of Sam Hoskins sam.hoskins@... [Q-LIST]
Sent: Friday, July 5, 2019 3:03 PM
To: Q-LIST@...
Subject: Re: [Q-LIST] Re: Flight report

Mike, how are you currently making the idle mixture adjustment?


On Thu, Jul 4, 2019, 11:19 AM q2pilot@... [Q-LIST] <Q-LIST@...> wrote:

Hi Kevin,

I don't think those compression numbers mean much.  I've seen engines fly well with 20/80 compression's!  You might have been having valves sticking or something else going on.  

I put new millenniums on this year also.  My reason was I was getting 2 hours to the quart...lots of ring blowby.  Oil on the belly.    After install, I flew 10 hours at redline and 1000' pressure altitude to break it in.  Open up your airflow and redline the engine!  Try to minimize taxi time.  I now have about 30 hours and in the last 5 I can't detect any oil consumption and no oil leaking now (suspect reduced crankcase pressure).

I'm still fighting with a MA3SPA that is running way to rich at idle.  Fowling my plugs on landing approach and taxi even tho I got it leaned out like crazy.  In flight the carb works fine.  I use auto gas and that fowls plugs way worse than 100LL.  But still, I want to get working so if there are any carb experts out there, help!

Fly Safe.
Mike N3QP Q200 


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