<VV> Balancing the carbs
JoePaduano at aol.com
JoePaduano at aol.com
Sun Aug 16 21:22:02 EDT 2009
This was on the internet in response to the question about balancing the
carbs
1.Disconnect all linkage to carb throttle shaft. Note: If this is not the
first time you have done this, disconnecting the linkage at the left carb
may not be necessary. I have done the procedure without this step.
2. Set MIXTURE screws out 1.5 turns. Set Idle Speed screws per Step 4,
Method One.
Start engine, warm for 15 min, idle is steady.
3. Balance carbs left to right with IDLE SPEED screws only.
4. Place Unisync on top of left carb, make sure the bottom seats so there
is no vacuum. Use the rubber air filter gaskets on top of the carb rim, then
place the Unisync on top for a good seal.
5. Try for the middle line on the Unisync, if not possible, try for the
lowest line.
Remember, try to get the strongest airflow. The ability depends on the car
and your carb’s condition.
Use the dial on the Unisync to raise or lower the ball. Once a setting is
secure, go to the right carb. Note where the ball is, if not at the same
line setting, adjust it and use the Idle Speed screw on the carburetor to
raise or lower ball. If you are unable to reach the same setting, go back to
the left carb and use the dial on the Unisync to readjust to a different
line, usually this is lower. Return to the right carb, use the Idle Speed
screw to adjust it to that level. Once both carbs are same level, recheck left
and right again. If you need to readjust again, repeat again.
Adjust linkage so it slides right in the hole located behind the left
carb.
6. Now that the Idle Speed screws are set and RPMs are generally 550-700,
the mixture screws are now adjusted to smooth the idle further (little
engine vibration, a good indicator is the Coil. It should not be vibrating much
and should be close to the same turns out when done.
The Mixture screw was set at the start of the procedure to the Corvair’s
starting point, a bit on the lean side. You may need to richen this.Turning
the screw clockwise creates a leaner, less fuel, mix. Counter clockwise, a
richer, more gas, mix.
To set mixture, turn screw IN clockwise slowly until RPMs drop slightly,
now back out counterclockwise SLOWLY until max RPMs are reached and no
farther, now turn SLOWLY back in enough to drop RPMS by about 20, usually about
1/8-/ 1/4 in. Remember, clockwise is LEANer, counterclockwise, RICHer. Once
mixture is set on left carb, the identical procedure is completed on the
right carb.
If you have a automatic transmission, place in gear. If you have balanced
carbs and the idle is correct, there will be very little difference between
neutral and drive gears, the car will not lunge forward and it will barely
move at all. You will be able to idle in drive for 3 minutes or more
without stalling. If your car does not, you need to keep tinkering with the
adjustment for the idle RPMs. Automatic idle should be between 500-600 RPM while
in Drive and not more than 600-700RPM in Neutral. Generally, the RPM
difference between D and N should be the least as possible. This may be
difficult to achieve for some cars.
If you have 3 or 4-speed, the RPM setting while idling should be not more
than 800 RPM max. The optimum is around 650-700 RPM. Idling at 800 RPM is
OK, just wastes more gas. Some cars depending on their condition, refuse to
idle too low. For example, my 65 auto, idles at 550 in D and 600 in N. The
67 stick idles at 750-800. They run fine.
When balancing carburetor air flow, you are adjusting airflow. Nothing
else. When adjusting idle mixture, you are only adjusting idle mixture- nothing
else.
You cannot harm an engine with an excessive lean idle mixture(less gas)
but it won't run good. On the other hand, a too rich mixture (excessive gas)
can cause foiled, sooty plugs and may stall the engine. To recap, you want
the best carb fuel mix for the idle speed setting you are at. It is a
difficult thing to learn. The carb mixture screw smoothes out a rough idle. As
soon as you press on the accelerator, you are no longer using the Idle
settings.
As soon as you throttle and accelerate, you are no longer dealing with idle
fuel mixture issues. Adjusting the idle mixture does not affect the car
when driving only when stopped and idling.
In a message dated 8/16/2009 7:49:20 P.M. Eastern Daylight Time,
virtualvairs-request at corvair.org writes:
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Today's Topics:
1. Re: gear ratio (jvhroberts at aol.com)
2. Leno - Rampside... (Secular)
3. Re: gear ratio (Jim Houston)
4. Re: engine help (shortle)
5. Re: Silver Late Model Corvair convert at the Woodward Cruise
(shortle)
6. Re: Exhaust manifold for 140 HP motor (shortle)
7. Driving (was: Silver Late Model Corvair convert at the
Woodward Cruise) (Robert Marlow)
8. Woodward Dream Cruise (Clark Hartzel)
9. Balancing the carbs (humor?) (Louis Armer)
10. Re: [FC] Turn signal cable not moving (Chris & Bill Strickland)
----------------------------------------------------------------------
Message: 1
Date: Sun, 16 Aug 2009 15:22:02 -0400
From: jvhroberts at aol.com
Subject: Re: <VV> gear ratio
To: lechevrier at earthlink.net, jhouston001 at cfl.rr.com
Cc: virtualvairs at corvair.org
Message-ID: <8CBECBDF76CF115-17FC-4EBA at FWM-D03.sysops.aol.com>
Content-Type: text/plain; charset="us-ascii"
Fortunately, ALL Corvair transmissions have a 1:1 top gear.?
However, as it has been pointed out, popping the top cover removes ALL
doubt! And gaskets are cheap.
John Roberts
-----Original Message-----
From: Chris & Bill Strickland <lechevrier at earthlink.net>
To: Jim Houston <jhouston001 at cfl.rr.com>
Cc: virtualvairs at corvair.org
Sent: Sun, Aug 16, 2009 2:50 pm
Subject: Re: <VV> gear ratio
> Then again, you can look at the code on the outside of the case and
> determine the ratio...
A nice idea that only works if nobody has changed the gears inside that
case over the last 40-50 years.
I know I've changed some, and certainly don't recall which ones are in
which case -- Dorai's is out and on the bench -- Count, & *Know*.
(or count engine revs vs an axle rev, knowing what your trans gears are
...)
Bill Strickland
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_______________________________________________
------------------------------
Message: 2
Date: Sun, 16 Aug 2009 15:39:30 -0400
From: "Secular" <rusecular at yahoo.com>
Subject: <VV> Leno - Rampside...
To: <virtualvairs at corvair.org>
Message-ID: <D1E05D859A7E484C886309C16736D607 at MSFPC>
Content-Type: text/plain; charset="iso-8859-1"
Jay Leno and the Rampside restoration:
http://corvairproject.com/cgi-bin/show.cgi?idx=20090601193427
Tony I.
------------------------------
Message: 3
Date: Sun, 16 Aug 2009 15:41:27 -0400
From: Jim Houston <jhouston001 at cfl.rr.com>
Subject: Re: <VV> gear ratio
To: jvhroberts at aol.com
Cc: lechevrier at earthlink.net, virtualvairs at corvair.org
Message-ID: <4A8860E7.10401 at cfl.rr.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I agree - I picked up what was coded as a 3.27, but I removed the top
cover and counted teeth to make sure before I put it in the car...
Jim Houston
jvhroberts at aol.com wrote:
> Fortunately, ALL Corvair transmissions have a 1:1 top gear.
>
> However, as it has been pointed out, popping the top cover removes ALL
> doubt! And gaskets are cheap.
>
> John Roberts
>
>
> -----Original Message-----
> From: Chris & Bill Strickland <lechevrier at earthlink.net>
> To: Jim Houston <jhouston001 at cfl.rr.com>
> Cc: virtualvairs at corvair.org
> Sent: Sun, Aug 16, 2009 2:50 pm
> Subject: Re: <VV> gear ratio
>
>
>
> > Then again, you can look at the code on the outside of the case and
>
> > determine the ratio...
>
>
>
>
>
> A nice idea that only works if nobody has changed the gears inside that
>
> case over the last 40-50 years.
>
>
>
> I know I've changed some, and certainly don't recall which ones are in
>
> which case -- Dorai's is out and on the bench -- Count, & *Know*.
>
>
>
> (or count engine revs vs an axle rev, knowing what your trans gears are
...)
>
>
>
> Bill Strickland
>
> _______________________________________________
>
> This message was sent by the VirtualVairs mailing list, all copyrights
are the
>
> property
>
> of the writer, please attribute properly. For help,
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>
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------------------------------
Message: 4
Date: Sun, 16 Aug 2009 13:45:36 -0600 (GMT-06:00)
From: shortle <shortle556 at earthlink.net>
Subject: Re: <VV> engine help
To: Bruce Schug <bwschug at charter.net>, Virtual Vairs
<virtualvairs at corvair.org>, Jim Houston <jhouston001 at cfl.rr.com>
Message-ID:
<4652651.1250451936422.JavaMail.root at elwamui-muscovy.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
And certainly make sure coil polarity is correct. + comes from harness, -
comes from distributor. I would also check dwell angle and initial ignition
timing. And as Bruce suggests, remove air cleaner, start engine, and put
hand over carbs. 1 at a time and try to get it to suck thru any trash that
may be blocking metering jet. Good luck and post results please.
Timothy Shortle in Durango Colorado
-----Original Message-----
>From: Bruce Schug <bwschug at charter.net>
>Sent: Aug 16, 2009 10:39 AM
>To: Virtual Vairs <virtualvairs at corvair.org>, Jim Houston
<jhouston001 at cfl.rr.com>
>Subject: Re: <VV> engine help
>
>
>On Aug 16, 2009, at 10:12 AM, Jim Houston wrote:
>
>> I'm changing the coil this morning... will see what that does (if
>> anything)...
>>
>
>
>I'll be interested to hear if the coil solves your problem. My guess
>is, it won't. Typical coil failure is: Engine (coil) gets hot, won't
>run. Engine (coil) cools off, runs.
>
>I'd sure check the coil lead and the condenser. Usually when my car
>runs badly, I replace the points and cap, which doesn't solve the
>problem, then I try and figure out what the problem really is. I don't
>pretend to be a whiz at trouble-shooting problems like this and am
>surprised you didn't get more responses. I'd also be sure you haven't
>gotten a bit of trash in a carb jet. But, it does sound like ignition.
>
>
>
>
>Bruce
>
>Bruce W. Schug
>Treasurer & Membership Chairman
>CORSA South Carolina
>Greenville, SC
>Stock Corvair Group
>Performance Corvair Group
>bwschug at charter.net
>
>CORSA member since 1980
>
>'67 Monza. "67AC140"
>
> _______________________________________________
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are the property
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>Post messages to: VirtualVairs at corvair.org
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> _______________________________________________
------------------------------
Message: 5
Date: Sun, 16 Aug 2009 13:53:59 -0600 (GMT-06:00)
From: shortle <shortle556 at earthlink.net>
Subject: Re: <VV> Silver Late Model Corvair convert at the Woodward
Cruise
To: peter koehler <pkoehler01 at atlanticbb.net>,
virtualvairs at corvair.org
Message-ID:
<18142431.1250452439483.JavaMail.root at elwamui-muscovy.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
I agree Pete, we should drive our Corvairs. I'll be going up next weekend
to Denver for the annual Dale Wilshire/Rocky Mountain Corsa picnic in
Sedalia in my '63 Rampside I have owned since 1980. Just under 600 miles
roundtrip. Yesterday in Durango Colorado I spotted a blue '61 Lakewood with
Arizona plates. I immediately turned around but could not catch them nor could I
find them again. But I tried. Hoping to see you all in Denver next weekend!
Timothy Shortle in Durango Colorado
-----Original Message-----
>From: peter koehler <pkoehler01 at atlanticbb.net>
>Sent: Aug 16, 2009 11:30 AM
>To: virtualvairs at corvair.org
>Subject: <VV> Silver Late Model Corvair convert at the Woodward Cruise
>
>The car is owned and driven by Stu Shuster of Birmingham,
>MI. The passenger is Stu's grandson, Paul (one of
>triplets!!!). Stu has owned this 1969 Monza convert since
>the early '70's after buying it from a fellow GM Design
>Staff employee way back when. And...he DRIVES it! Which is
>what all of us should do with our Corvairs. Right? -
>Caveman Pete in MI
> _______________________________________________
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> _______________________________________________
------------------------------
Message: 6
Date: Sun, 16 Aug 2009 13:57:02 -0600 (GMT-06:00)
From: shortle <shortle556 at earthlink.net>
Subject: Re: <VV> Exhaust manifold for 140 HP motor
To: Tony Underwood <tony.underwood at cox.net>, virtualvairs at corvair.org
Message-ID:
<13483844.1250452623112.JavaMail.root at elwamui-muscovy.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
I'm sure 1 of the vendors would have a good used 1. Try Jeff Williams at
California Corvairs for "rot free" parts. Or LS Corvairs in Harbor City,Ca.
Timothy Shortle in Durango Colorado
-----Original Message-----
>From: Tony Underwood <tony.underwood at cox.net>
>Sent: Aug 16, 2009 8:59 AM
>To: virtualvairs at corvair.org
>Subject: Re: <VV> Exhaust manifold for 140 HP motor
>
>At 06:13 AM 8/16/2009, David B. Neale wrote:
>>Does anyone please have a driver's side exhaust manifold, in good
>>condition, for a 140 HP motor, that they are willing to sell?
>>
>>The ears on one of my manifolds are both broken, previously 'repaired'.
>
>
>If you don't mind the jackleggedness of it all, there's a simple fix
>for this in the tech guide involving a muffler clamp and a couple of
>eye-bolts. It works, done it.
>
>
>Not for all tastes but if you need an exhaust manifold and nothing
>else is immediately available it's an alternative that will serve
>either for years or until you turn up a manifold with good ears.
>
>
>
>
>tony..
> _______________________________________________
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------------------------------
Message: 7
Date: Sun, 16 Aug 2009 16:18:24 -0400
From: Robert Marlow <Vairtec at optonline.net>
Subject: <VV> Driving (was: Silver Late Model Corvair convert at the
Woodward Cruise)
To: shortle <shortle556 at earthlink.net>
Cc: virtualvairs at corvair.org, peter koehler
<pkoehler01 at atlanticbb.net>
Message-ID: <4A886990.2090506 at optonline.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
shortle wrote:
> I agree Pete, we should drive our Corvairs. I'll be going up next
weekend to Denver for the annual Dale Wilshire/Rocky Mountain Corsa picnic in
Sedalia in my '63 Rampside I have owned since 1980.
>
On Friday night, Sue and I took our 1963 Rampside that we have owned
since, umm, 2009, to a Cruise Night at a local speedway, a cruise night
that included actual cruising around the track. Track is a paved oval,
banked 30 degrees in the corners! (Daytona is 31.) We were the only
Corvair out of well over 100 cars.
> Just under 600 miles roundtrip.
Just under 200 miles round trip. Ya got us beat!
> Timothy Shortle in Durango Colorado
>
Bob Marlow in Annandale New Jersey
------------------------------
Message: 8
Date: Sun, 16 Aug 2009 16:47:11 -0400
From: "Clark Hartzel" <chartzel at comcast.net>
Subject: <VV> Woodward Dream Cruise
To: "'Virtual Vairs'" <virtualvairs at corvair.org>
Message-ID: <E7391EF3463941D9BA4A1433F04A376A at grumpyjo>
Content-Type: text/plain; charset="US-ASCII"
From: Bruce Schug <bwschug at charter.net>
There are two significant automotive events going on right now, the
Woodward Dream Cruise and the Monterey Historic Races. There are
dozens of pictures of these events on autoblog.com. You may want to
first look at this Corvair. I should know who owns this now - somebody
refresh my memory.
Bruce, that is Stu Shuster of the Detroit Area Corvair Club. He works
part time at the GM Heritage Center museum after retiring from GM
Styling.
He will be hosting our Homecoming visit to the museum on Friday Aug
21st.
Clark Hartzel
------------------------------
Message: 9
Date: Sun, 16 Aug 2009 18:05:53 -0400
From: Louis Armer <carmerjr at mindspring.com>
Subject: <VV> Balancing the carbs (humor?)
To: Stephen Upham <contactsmu at sbcglobal.net>
Cc: virtualvairs at corvair.org
Message-ID: <E1McnrR-0000jq-87 at elasmtp-banded.atl.sa.earthlink.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Right on schedule !!! ;-) ...................HERE'S STEPHEN !!! <GGG>
FrontMan
WTBRT PR
ASKUS, TEXAS
///////////////////////////////////////////////////////
///////////////////////////////
At 05:05 PM 8/15/2009, you wrote:
>I have somehow misplaced my instructions for syncing the carbs using
>a Unisyn. Does anyone have that procedure handy. I know I've asked
>this before and I'm sorry to have to ask again. I have the swivel
>type linkages installed if it changes anything.
>
>Stephen
> _______________________________________________
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> _______________________________________________
CORSA Member
Corvanatics Member
Corvair Atlanta Director
1965 Corsa Coupe
1964 Greenbrier
http://darthvair.com
SECC Member
1965 Corsa Autocross car 1/2 owner
http://www.wtbrt.com/
------------------------------
Message: 10
Date: Sun, 16 Aug 2009 16:48:31 -0700
From: Chris & Bill Strickland <lechevrier at earthlink.net>
Subject: Re: <VV> [FC] Turn signal cable not moving
To: VirtualVairs <virtualvairs at corvair.org>
Message-ID: <4A889ACF.7080709 at earthlink.net>
Content-Type: text/plain; charset=us-ascii; format=flowed
Ron wrote:
> It's a lot easier to just replace the screws!
Why replace them -- nobody said they were broke? If one is going to
repair older GM's, one must invest in the required tools, so why not use
them?
If one starts replacing factory parts with other stuff, where is
the stopping point? Why not put Honda or Subaru or Porsche drivetrains
in just because it can be done?
Bill Strickland
------------------------------
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