Originally Posted by
whiskey29
You are correct, in competition only 4 engines are allowed, asp, supertigre, os and I dont remember the last one.
I have used ASP before however, OS turns 500 more RPM.
However, everyone uses OS .46 and some only use it for a few races before changing the piston and liner,
the only fuel allowed is coolpower 15%.
I guess running the engine screaming at 16, 17k shorten it lifespan by huge factor.
That is why I am searching a better way to power the plane for practice routine,
The need to practice with similar speed is important to get good feeling,
Alternatively, I can build a plane with may be less drag to achieve similar result, however, right now I opt for engine change.
OS cylinder liners are poorly manufactured. The ASP liners are much better made and often used to replace peeled OS liners. Most folks that use ASP liners in OS engines have noted identical or better performance with longer life.
Running engines at the RPM they were designed for will not shorten their life. Using substandard fuel (cool power is horrible fuel in my experience) and improper needle settings will however shorten their life. Of the engines you listed, the SuperTigre is the better engine of the bunch. If RPM and speed are what you're after, Dub Jett engines are fantastic, however if you cannot use them in the race, I'd not spend the money on one.
If it were me, I'd use the ASP engine and put an OS carb on it.