I have been struggling with carburetors since the begining, two years ago and have finally got it working as it should. I have learned a lot in this during this time and wanted to share it with you. 

Tale of two Carbs  

The link goes to a Google Docs file with pictures and such and won't display here. Feel free to comment here. 

The gist of the article is this, I didn't know what I didn't know and now I do. 

I was floundering and really did not know that 1400+ EGT's were too high, 5.5 GPH is too low at full rich full throttle.

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A super fast way to tune any engine is with a wide band O2 sensor.  You can your problem instantly.  I remember when I build a custom motorcycle and it came time to get it running.   I didn't know much about carbs and I didn't know how to tune properly.  Like you I learned everything I could and got it figured out.  Some times the long way around is the best way around. 

Yeah I know that, I wanted to use minimal instrumentation. Calculated risk.


Sorry you had to go through all these problems. Thanks for sharing though. I am building a CH 650 B and will be putting the Corvair in it. Learning from others helps us all.

An interesting and informative read, Ron. Thanks. I will be using a Corvair also so your info will be of help.

That's great information. Thanks for posting. Should be helpful.

Today I was flying at 3000' and engine was leaned out to about 1350-1380 EGT at 2800 RPM. I pushed the throttle full and watched the EGT's go down to1200 without moving anything but the throttle. OAT was 67F and all the other temps were in the green, CHT 280-300, OT 220-230. I think things are looking pretty good now that the engine is getting enough fuel.


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