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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