<VV> Turbo fuel consumption problemI'd map o
FrankCB at aol.com
FrankCB at aol.com
Thu Feb 14 12:47:02 EST 2013
This response as well as the others you've gotten are all good ideas.
You might also want to check out my chapter (#33) on Turbocharging in the
CORVAIR BASICS manual available from CORSA. This covers (among other
things) modifying the stock pressure retard setup on the turbo distributor to
add vacuum advance capability. The turbo Corvairs are the ONLY Corvairs
that don't have ANY vacuum advance in the ignition timing. This failure
causes a significant increase in fuel consumption as well as poorer throttle
response especially in normal "around town" driving in mostly unboosted
conditions. You may want to consider some of these suggestions in chapter 33 if
all the previously given good ideas don't produce improvements in your
Good luck and let us know what you discover.
Frank "boost IS the substitute for cubic inches" Burkhard
In a message dated 2/13/2013 9:41:21 P.M. Eastern Standard Time,
djtcz at comcast.net writes:
Date: Wed, 13 Feb 2013 17:49:22 -0500 (GMT-05:00)
From: Grant Young < gyoungwolf at earthlink.net >
Subject: <VV> Turbo fuel consumption problem
I have a friend who has asked what might be causing his turbocharged
Corvair to be getting
very poor fuel mileage. While the first thought might be a carburetor
problem, it was been
rebuilt recently and seems to work like it should - easy start, smooth
idle, good acceleration
and boost and no driveability or gas fumes (rich) issues. He says he
usually drives it spiritedly,
not wanting to get things carboned up, and is getting well under 10 mpg,
sometimes only 4-5. Doesn't
seem to have a leaking fuel pump either. Just checking to see if anyone
has experienced similar
issues or has recommendations on what to look for (other than Smokeys).
What mileage did he get before the carb rebuild?
If good, what else was changed?
Is the gas tank damp underneath?
Is the vapor return line in pace, and in use?
If idled for 10 minutes is a gasoline smell noticeable under or beside the
I'd verify the TDC mark on the damper and map the centrifugal advance
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