Would like suggestions on both cold and hot starts with the above engine in an RV6. Thanks. John
Here's my simplistic view on the subject, John.
When the engine is cold, some fuel is needed in the intake manifold to get the thing running.
When the engine is hot it starts best with no priming.
I have the AFP 200 system. About 5 seconds of prime for a cold engine and no prime for the hot engine.
The only time I have had trouble this past season is when preheat was applied over night. The engine is somewhere between cold and hot and it seems about 2 seconds of prime works best. Five seconds definitely is too much.
With a Bendix system you will have to play with the mixture to gets things right. With AFP, for starting, the mixture is always full in and fuel flow is controlled with the purge valve. Either way, start with a plan of your own. If it works remember it, if it doesn't, try something different.
In the beginning with AFP, I had some problems but they were solved by
(1) electric pump on always
(2) always hit the starter with the mixture or purge valve off but introduce fuel immediately when hitting the starter, cold or hot
(3) if it doesn't pop off in 3 or 4 blades, stop, cut fuel flow and try something different.
If the engine doesn't start it either has too much fuel or not enough. If it is just right it will start almost instantly every time, but it will quit if fuel is not on the way quickly, that's why I introduce fuel when hitting the starter.
Eventually you will figure it out and feel confident. At least that's the goal.
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