Power Valves and Throttle Stops

nomad · 04-20-2017, 11:21 PM

Thought I'd add something to the conversation. If you have a data recorder then you'll get a handle on this PV thing pretty quick. I run an O2 in the #1 pipe and the #8. It gives me an idea of what's going on at both "ends" of the engine. Thus, I can have equal O2s at each end. Plus, I track manifold vacuum.

We've worked out what primary jet gives us the cruise O2 we want (because the PV is closed here, so it doesn't contribute fuel). We use the PVCR size to give us the WOT O2 to match the secondaries. Thereafter, necessary jet changes involve the rear jets and the PVCR but, not the primary mains.

The data recorder will tell you exactly when the PV opens and you can tailor that to your needs.

It's not hard to do but, just seems so here because I'm not really a wordsmith.

BTW I run an in line stop.

04-20-2017, 11:21 PM	#8
nomad Junior Member Join Date: Oct 2013 Posts: 47 Likes: 5 Liked 7 Times in 4 Posts	Re: Power Valves and Throttle Stops Thought I'd add something to the conversation. If you have a data recorder then you'll get a handle on this PV thing pretty quick. I run an O2 in the #1 pipe and the #8. It gives me an idea of what's going on at both "ends" of the engine. Thus, I can have equal O2s at each end. Plus, I track manifold vacuum. We've worked out what primary jet gives us the cruise O2 we want (because the PV is closed here, so it doesn't contribute fuel). We use the PVCR size to give us the WOT O2 to match the secondaries. Thereafter, necessary jet changes involve the rear jets and the PVCR but, not the primary mains. The data recorder will tell you exactly when the PV opens and you can tailor that to your needs. It's not hard to do but, just seems so here because I'm not really a wordsmith. BTW I run an in line stop.