<VV> Poor Gas Mileage

[N. Joseph Potts]

What's a PV carb? I know what an HV is, but PV?

JP
Miami, Florida USA
1966 Corsa coupe 140hp 4-speed with A/C

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org]On Behalf Of NicolCS at aol.com
Sent: Tuesday, September 06, 2005 9:25 AM
To: virtualvairs at corvair.org; pp2 at 6007.us
Subject: <VV> Poor Gas Mileage


I suppose a "stuck open" high-speed enrichment valve is possible on a carb
that isn't clean internally. In my experience, power valves get stuck IN
their
seat, not out. Normally both the pump check valve and the power valve return
to
their seat freely, assisted by gravity and vibration.  Note that only a
small
number of Corvair carbs have power valves; only 64-5 primary carbs. Your '67
didn't come with PV carbs originally.  To check yours, locate the fuel inlet
side of the carb, follow the long accelerator pump arm to the bottom and
there,
at the lower edge of the bowl, you will find an aluminum plug on a PV carb.
The plug's head is about 1/8" in diameter.  No plug = no power valve.
Good hunting!
Craig