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As others have suggested, you can run it to get it warm and see if it improves. Check the rocker arm clearances to make sure a valve isn't being held open. Is the air escaping through the carb (intake valve) or the exhaust pipe (exhaust valve)? If you have a borescope you can have a look at the valv...

I am amazed by the amount the gear legs flexed and sprung back. I guess that's why Monnett went with titanium. Last year (2022) when I landed at Airventure on 36 with a very stiff left cross wind (I'm a tail dragger), after touchdown the wind heeled the Sonex so far onto the right gear that I was s...

Yikes! Glad it was only metal and not bone that got hammered. We've enjoyed your participation, and living vicariously on your trips. I'm a year into building an RV-7, but still flying (for 9 years+) my Sonex, and will be for the next few years. I'll likely also still hang out on the forum even afte...

Thanks. I had 1/3 of it done for months, and finally figured I should finish it before Airventure 2023 :-)

Mine also returns to the top of the valve cover: http://www.mykitlog.com/users/display_log.php?user=mikesmith&project=698&category=7960&log=186492&row=95 Clever idea on how to build an air-oil separator Mike! Do you know how much yours weighs? Mine is a bit heavy, somewhere over a p...

The VW is not a tight tolerance engine. I almost never get good values on a leak down test when the engine is cold, though I do still test it that way to start. Then I go fly in the pattern for a few circuits and come back to do the test. The numbers have always been well within the 70's, and someti...

Mine also returns to the top of the valve cover:
http://www.mykitlog.com/users/display_l ... 492&row=95

Remember guys, at negative G's, depending on your tank vent setup, you could expel fuel. Don't get it on the windshield. Bad, bad. Replacing a windshield isn't easy. I did the up/down vent. It goes up a few inches above the cowl, turns 180 degrees down, then goes down the firewall to an exit at the...

I've put a number of aerobatic flights on YouTube:

https://www.youtube.com/@mikesmith208/videos
https://www.youtube.com/watch?v=ctzIi77rxok

Graeme's numbers are pretty close to mine (for aileron rolls I prefer not being slow, so 120 kts for me is the usual pull up speed). You do have to watch the revs and work the throttle on the downhillls.

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