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From my car experience, they may work for a while when new, but unless the shiny piston rod extends out the bottom (and not out the side or top) when installed and parked, they soon lose their internal gas precharge out the rod seal.

They couldn't have used it as a reason if E0 (MoGas) as promoted by EAA and Petersen aviation (no relation) had been more widely accepted and available. This controversy has been going on for over 25 years. How much time should our market have needed to respond?

Should have mentioned it but I was assuming a previous shutdown with the mixture, and not a Bendix Stromberg carb engine. My friend has a C-85 Aeronca Chief and has to shut the engine off with the switch.:eek:

It would certainly look like both your mags have impulse couplings. You should be able to hear both of them clank almost together (exactly???) when slowly turning the engine over by hand. Do it switch OFF of course.

(It happens... Ultimate Reno Air Race dead-stick landing after blown engine and propeller snaps off!!!) Pretty clear what happened and when. That's a spectacular example of fatigue in that home brew prop extension and consequential failures. The fatigue cracks progressed around the spokes...

Just wait until you have to buy some simple OEM part like a door lock.:eek:

(Is there a specified lift?) Not that I've ever seen. Use a dial indicator to measure the valve spring cap motion, checking all cylinders. They should all be within a few thousands. Bear in mind that on Lycoming engines around the center of the camshaft length, there are two cam followers...

How about a small ventilating fan pressurizing the oil-add cap for a still hot engine? This would clear a lot of the water etc out the breather, but the system would have to be applied while the crankcase is still hot. PCV (positive crankcase ventilation has been used on automobile engines for...

Don't use paper for a template. Wrap it using a single sheet of drafting Mylar, which is much more dimensionally stable and transparent. Mark the Mylar with a very sharp pencil. Center punch through the mylar. You will have to use some means (facing pencil lines?) to make sure the mylar hole...

Aviator explorer Wiley Post was one eyed.

OP - I understand it once did make static rpm........? If not and having checked ignition timing & the other obvious items listed above, in desperation you might check that the camshaft is properly indexed to the crankshaft by comparing the valve lap vs TDC on this engine, and on another...

Be prepared for a substantial loss of useful load......

Except that as a manufacturer of fatigue testing systems, we used industrial grade 8 fasteners lubricated with moly-disulphide, which is a more powerful lubricant than oils and will give more consistent preloading. I'll have to admit though that the general policy was to not reuse fasteners in...

If I did it right, this is some very old data I got from Standard Oil who apparently created it in the 1930s. https://www.dropbox.com/s/jm1q2d0kbbjqz92/WaterSolubilityInGas.JPG?dl=0 It shows the water solubility in various petroleum compounds vs temperature. 100LL gasoline is a mixture of...

BTDT w a 172H at KFCM on a bitterly cold day. Landed downwind from 27R (then) onto a parallel 9R runway after an obvious post-lift-off fuel starvation that didn't reveal itself in the previous runup. Never left the boundaries of the airport and ended up between the runways after a teardrop...

I think there could be justification for more stringent rules for automobile drivers as the proximity and other interface elements to other vehicles and pedestrians is so much greater. Drunk airplane pilot vs drunk car driver? I think the drunk car driver is more of a public hazard.

A private curriculum should really include a rearward CG /gross weight max performance takeoff. I'm surprised if it doesn't. Ask!

Both of the OP's pix show the crack originating on the cylinder side of the flange, with final failure being on the outboard side of the stud. This would be expected with flange flex. My guess would be under-torquing (under-preloading) but that is only speculation. The area of final failure...

Interesting! The specified torques (600 in lbs for a 1/2 inch fine thread stud) are not particularly high compared to my industrial experience of 80 ft lbs on a 1/2-13 coarse thread grade 8 bolt (I'm a mechengr, not an A&P). This means that there must be flange-flex under the head of the...

"RTV can do that." And I'll bet the referenced case involved a clicker type torque wrench rather than a bending beam type. If nothing else the clicker will under-torque in the presence of any squeeze-out in the joint. A bending beam wrench allows the operator to hold torque for a short time...