piston engine solutions

[U2]

1 What causes exhaust valve stretching in aircraft engines such as continental engines?

2 What causes exhaust valve seat problems (leaks)?

3 What causes exhaust guide widening?

4 What engine handling techniques can a pilot do to prevent injector blockages?

5 When in flight or on the ground how can a pilot unblock a blocked fuel injector?


U2


These questions have been edit into my first post!

How far is commercial general aviation away from seeing engine modernisation. I mean we still use mixture contols and magnetos!

When will light aircraft be like modern cars. i.e one power lever and thats it?

I have read about the new diesel cycle jet A-1 burning engines. Also, full authority digital engine controls being tested at the moment.

When will the day come when a G.A pilot can fly a light aircraft like airline pilots (one lever per engine to worry about)?

I await the day that aircraft are like ,odern cars. Plastic, one lever for thrust, sound proof and a pleasure to be a passenger.


U2

[Volume]

1+2 : The very high temperatures at the exhaust valves. This stresses the valve material to a point where it is starting to soften and is lengthened by valve spring preload. Same high temperatures lead to small deformations at the cylinder head (exhaust valve side is much hotter than inlet valve side) so the valve seats get a little oval and high gas is blown by, causing even more deformation.
Valve seats are additionally loaded by lead deposits and carbon buildup due to rich mixture.
4+5 : dirty fuel. Refill just at modern stations with high usage rates, they should have the cleanest tanks. Fuel filters in airplanes are different design as for cars, where much much finer filters are used. But theese fine filters tend to block completelzy if contaminated with to much water (wich is normally in sollution on cars due to the high ethanol content of mogas, but is dangerous is your fuel gets very cool at high altitude and ice cristals might build up at the filter)

[CessnaEng]

You'll find some interesting stuff here, maybe even an answer:)

http://www.sacskyranch.com/pilots.htm