KatanaPilot
Well Known Member
I am chasing an induction leak on my new IO-540 equipped with SDS EFII. I started with idle manifold pressure around 17" at 800 RPM. Found one leak around the threads of the Borla fuel pressure regulator. Took care of that and got the MP down to around 13.5" at 800 RPM. Still seems high, as I am used to 10-11" on my RV-7.
I had the SDS no-leak o-rings installed, but took them out thinking I might have a pinched o-ring. There were none, but I installed the OEM intake rings with new gaskets just to eliminate that as a possible source. I cleaned the intake tubes and also installed constant tension clamps on the rubber hoses between the BPE sump and the intake tubes.
I have three different sources of MP fed by two independent MP taps on opposite sides of the engine. I've tested these lines under vacuum and they hold steady. So I do not think it is an indication problem.
Next step is to spray some water at the rubber hoses on the intake tubes with the engine at idle.
Any other good suggestions as to where to look?
I had the SDS no-leak o-rings installed, but took them out thinking I might have a pinched o-ring. There were none, but I installed the OEM intake rings with new gaskets just to eliminate that as a possible source. I cleaned the intake tubes and also installed constant tension clamps on the rubber hoses between the BPE sump and the intake tubes.
I have three different sources of MP fed by two independent MP taps on opposite sides of the engine. I've tested these lines under vacuum and they hold steady. So I do not think it is an indication problem.
Next step is to spray some water at the rubber hoses on the intake tubes with the engine at idle.
Any other good suggestions as to where to look?