AVBLEND

[GeeBee]

http://eaaforums.org/showthread.php?2514-Mike-Busch-Maintenance-Forums/page3

 

 

[jetdriven]

that engine was still running, and the cam, although pitted, was still rolling along. and would continue to.  Show me one that caused the engine to have to be torn down, because theres hundreds of Mooneys that have, for flat tappet cams.

[Guest]

7 hours ago, GeeBee said:

Why are they letting others build and develop?

 

Well let me suggest a reason.  The US has more lawyers than engineers?

Clarence

[GeeBee]

No doubt about that. Most GA mfrs place a 33% reserve for product liability costs.

 

[Tim Jodice]

If traditional piston aircraft engines are inferior why are the majority of experimental aircraft flying with one.

I know there are exceptions, I saw a velocity with a small block chevy in it but by far they use plain jane Lycoming or Continental engines.

[tmo]

The gripe was with lubrication (so more relevant to the thread) and corrosion inhibition by modern synthetic oils. Which are allowed in the newer aviation engines (Rotax, Continental Diesel, Thielert) but not in the traditional ones that run on leaded avgas.

Interestingly, I believe the Rotax can run on avgas (more frequent service intervals as punishment) but still use modern automotive motor oil... Ah, yes: Users running leaded AVGAS more than 30% of the time should only use mineral or semi-synthetic oils, since a full-synthetic oil will sludge and create residues when used with leaded fuel. Quoted from rotaxservice.com

How about running Mobil-1 in a O-320 or IO-360 that runs on unleaded (from the petrol station, Warter Fuels, Swift Fuels, or whatever) based on SI1070 from Lycoming or the auto fuel STC from Petersen?

[GeeBee]

The problem with synthetics is the polymer chains are "too slippery" to retain lead induced contaminants so it is perfectly logical not to use them with leaded fuel. I am sure when we switch over to unleaded aviation fuel it will be recommended to run a 100 hours or so on regular dino oil until the engine clears out of lead induced contaminants before going to synthetic oil. 

 

 

[tmo]

Point is, there are good ol Lycoming and, to a lesser extent, Continental engines designed for lower octane avgas that are run on 100% unleaded car gas, legally. Yet they still aren't legal to be run on Mobil1.