Which power valve?
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Car: NCC-1701-D (docked in AZ)
Engine: impulse drive
Transmission: fusion reactors
Axle/Gears: Rescued from the Borg by my crew
Which power valve?
Trying to determine if my power valve is the right one or not. I am using 4.5's and I checked my vac. At idle it's at 5inches. Under load it runs 7 inches and full throttle 0 inches. I seem to be blowing a couple valves now and again on my 780cfm holley. Is there more info I am missing here to help with this question? I have a huge cam that allows almost no vac which is why I have a vac reservoir for the power brakes.
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From: Waterloo, Iowa
Car: 86 firebird with 98 firebird interi
Engine: pump gas 427sbc Dart Lil M 13.5:1
Transmission: Oldani TH400 w/ BTE 9" convertor
Axle/Gears: 31 spline Moser/full spool/4.11Rich
If the 5" at idle is with motor warmed up and in gear, you need a 2.5 PV
Thread Starter
TGO Supporter
Joined: Oct 2003
Posts: 2,069
Likes: 0
From: ready room
Car: NCC-1701-D (docked in AZ)
Engine: impulse drive
Transmission: fusion reactors
Axle/Gears: Rescued from the Borg by my crew
Originally posted by IHI
If the 5" at idle is with motor warmed up and in gear, you need a 2.5 PV
If the 5" at idle is with motor warmed up and in gear, you need a 2.5 PV
Supreme Member
iTrader: (1)
Joined: Apr 2002
Posts: 4,671
Likes: 1
From: Waterloo, Iowa
Car: 86 firebird with 98 firebird interi
Engine: pump gas 427sbc Dart Lil M 13.5:1
Transmission: Oldani TH400 w/ BTE 9" convertor
Axle/Gears: 31 spline Moser/full spool/4.11Rich
PV does'nt mean squat once you past 1/4 throttle. To get the right PV you take what you vacuum is in gear with motor warmed up and divide it by 2.
Why your going through multiple PV's is beyond me
I've run multiple carbs and this current 950HP for 4 years straight and have'nt lost 1 single PV yet.
If it's truely 5" at idle in gear- warmed up, trust me, buy the 2.5" PV's., set your idle mixture screws and get on with more important things.
Why your going through multiple PV's is beyond me
I've run multiple carbs and this current 950HP for 4 years straight and have'nt lost 1 single PV yet.If it's truely 5" at idle in gear- warmed up, trust me, buy the 2.5" PV's., set your idle mixture screws and get on with more important things.
Thread Starter
TGO Supporter
Joined: Oct 2003
Posts: 2,069
Likes: 0
From: ready room
Car: NCC-1701-D (docked in AZ)
Engine: impulse drive
Transmission: fusion reactors
Axle/Gears: Rescued from the Borg by my crew
Originally posted by IHI
PV does'nt mean squat once you past 1/4 throttle. To get the right PV you take what you vacuum is in gear with motor warmed up and divide it by 2.
Why your going through multiple PV's is beyond me I've run multiple carbs and this current 950HP for 4 years straight and have'nt lost 1 single PV yet.
If it's truely 5" at idle in gear- warmed up, trust me, buy the 2.5" PV's., set your idle mixture screws and get on with more important things.
PV does'nt mean squat once you past 1/4 throttle. To get the right PV you take what you vacuum is in gear with motor warmed up and divide it by 2.
Why your going through multiple PV's is beyond me
I've run multiple carbs and this current 950HP for 4 years straight and have'nt lost 1 single PV yet.If it's truely 5" at idle in gear- warmed up, trust me, buy the 2.5" PV's., set your idle mixture screws and get on with more important things.
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