View Full Version : PA28 question
Night Rider
15th Sep 2002, 18:42
Hi all,
Just a quickie to ponder.
The Lycoming 0-320 engine on the PA28 Cherokee 140 has a conventional enough priming system, but is there any special reason why the primer only primes 3 of the 4 cylinders?
Many thanks.
GoneWest
15th Sep 2002, 18:53
Yep - if you overdo it, and flood the engine - you still have a chance of starting normally with the "dry" one.
Oktas8
18th Sep 2002, 22:58
GoneWest's explanation sounds wrong to me - flooded start procedure involves purging all the cylinders, and you certainly can't start a four cylinder engine with only one firing!
I always thought it was because only three cylinders needed to be primed - ie three out of four primed is enough to crank the engine over several times.
I'm only guessing though. :(
Steamhead
21st Sep 2002, 19:05
The fourth cylinder is used for connection of manifold pressure
gauge on those engines with constant speed propellers
usually #4 cylinder ( Stb'd aft cylinder)
Regards