ORIGINAL: jaka
Hi!
Did you honestly belive that running an ABC engine a little rich would destoy it...???[8D]
Nothing could be further from the truth!
He's not talking about a little rich, he's talking about running it sloppy rich. There is a difference.
You can run any two or fourtsroke as rich as you like without destroying anything.
The only thing destroying our engines is heat (running too lean, wrong compression, wrong glowplug, too much nitro) and dirt.
Nothing else!
Our engines can tolerate much... we don't have to be soo finicky about how rich we run them as long as we don't run them too lean!
Jan, why don't you put your engines where your mouth is? Take a sample of let's say 2,000 ABC engines of various sizes and manufacturers. Mount these engines on test stands. Put each of them through a similar number of runs that the average sport engine would go through, perhaps 5,000 each. Oh, and while you're at it, why don't you use some of the 10% oil fuel you so strongly advocate? Run 1/2 of them sloppy rich as the OP proposed, and with your fuel. Follow the engine manufacturer's recommendations for the other half. When you're finished, report the results here. If the sloppy rich procedure you've so enthusiastically endorsed works better than that recommended by the manufacturers people might listen. Until then, I'm sticking with the opinions of those who know what they are doing.