Piper fuel priming systems

Matthew

Matthew

Touchdown! Greaser!
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Matthew
The 4-cyl Warriors prime 3 cylinders, and the PA-28-236 primes 5 of 6. I've forgotten the specifics on the Cessnas I've flown, but I think it's normal to have a single non-primed cylinder.

Why?

My initial guess is that at least one cylinder can't be flooded if it isn't primed. I've known about this for a while, but it wasn't until yesterday that I came back to it and wondered about it again.
 
manifold pressure line on the unprimed cylinder - or so I thought.
 
I thought my warrior only primed a single cylinder...hmm
 
jetedrick said:
I thought my warrior only primed a single cylinder...hmm
Click to expand...

Maybe. I'm pretty sure the -161 POH shows three.

Edit: I just verified the -161 (Warrior II) POH shows primer going to 3 cylinders.

EdFred said:
manifold pressure line on the unprimed cylinder - or so I thought.
Click to expand...

Manifold pressure line? Even if it isn't a CS prop?
 
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My Archer used to love all the primer you could give it. 5-6 pumps in the summer and maybe 7 in the winter. Never flooded.
 
On the Archer at least, the POH mentions an optional MP gauge. I'm sure the engine is certified with a 3 port primer and they couldn't add another port even if they wanted to.
 
Matthew said:
Why?
Click to expand...
As mentioned earlier, it's my understanding on Pipers there are only 3 primer ports used to make available the 4th port for an optional MAP. On other aircraft there can be a standard single primer port with an option to add 2 more. Sometime the single port versions squirt fuel in the common manifold. It usually depends on what the OEM designs/decides.
 
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