Paul ,
I have been out of the loop for a couple years. Looking forward to getting back to my 13B Murphy
Elite project this winter. I was hinging on the P-port as an intake option but never really got
enough info with regard to my application to make a good decision. I am setting the plane up for
STOL and alot of my flying will be river bars and back country strips.I need crisp responsive low
RPM throttle response . Does the p-port intake have any low end throttle penalty's for bush flying
as opposed to a factory 4 port intake.
Geir Anderson.
Not that I noticed. Idle is 2000 engine RPM. Prop RPM is 700.
Do you have the 2.17 gear box? If so prop RPM is then 920 RPM.
A p-port will help a lot depending on your current manifold but will
not be top HP with a 2.17:1 PSRU. It is 250 HP at 7500 but you will
not get that high with a 2.17:1. You should see about 200 HP at 6000 RPM.
Is this still your current intake manifold?
Is that Ross a 2.17:1 ?
Paul Lamar
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I have a Ross 2.85:1
I will not be using the intake you have shown ,However if the P-port does not suit my type of low
and slow flying I will rebuild something along the same lines .
if I remember correctly Daryl Drummond dyno'd the engine with that intake at 180HP/7200 RPM
geir andersen
That is pretty good HP. Steve Beckman has a lot of experience flying a p-port.
What about throttle response Steve?
Paul Lamar
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