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10/22/12 10:26pm - Original Message: 'carb boiling'
laryred77
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Linesville, PA - USA

Vette(s):
1977 red coupe/T tops red int. 1999 magnetic red convertible 6 spd manual

Joined: 6/25/2012
Posts: 26
 anyone using carb shields

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10/22/12 11:05pm - Reply: 'Re: carb boiling'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats

Joined: 1/28/2010
Posts: 763
Mine is on the workbench waiting to be installed. Know of at least 3 people with them on and as far as I hear they all like them and say they work.

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Dan T
 

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10/23/12 12:12pm - Reply: 'Re: carb boiling'
aceinthehole Lifetime Member
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Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
 I always feel a little bad about admitting it but, this term is unfamiliar to me. Can anyone step up and educate me ?  Thanks.

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Jimmy B.
Just can't wait to get on the road again.

 
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10/23/12 12:24pm - Reply: 'Re: carb boiling'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats

Joined: 1/28/2010
Posts: 763
aceinthehole said:  I always feel a little bad about admitting it but, this term is unfamiliar to me. Can anyone step up and educate me ?  Thanks.

Another term for vapor lock, or the carburetor getting so hot that the gas in it boils off and causes the engine to stall from the lack of gas....not good Censored The shields block the heat from the manifold getting to the carb.


 



|UPDATED|10/23/2012 9:24:13 AM (AZT)|/UPDATED|


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Dan T
 

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10/23/12 12:25pm - Reply: 'Re: carb boiling'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19447
My experience with them has not been good. They always seem to create vacuum leaks that just won't go away. The ones we used were the thin aluminuminum ones, and no matter what we did, we could never get them to seal properly. A better choice is to use the thick, phenolic plastic spacers, as they insulate the bottom of the carb from heat much mo betta. Of course, on a Corvette, making the carb sit higher creates it's own problems.

Jimmie, the discussion is about using a heat shield(thin piece of alum. sheet) under the carburetor in an attempt to keep some of the heat from the intake manifold from being absorbed by the carb, which can cause the fuel in the carb to boil. Thumbs Up




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Joel Adams
C3VR Lifetime Member #56    
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10/23/12 12:36pm - Reply: 'Re: carb boiling'
aceinthehole Lifetime Member
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Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
 Thank you gentlemen, that makes sense. Don't believe I've ever had that problem, and our best lessons are learned from experience. Thanks very much guys.

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Jimmy B.
Just can't wait to get on the road again.

 
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10/23/12 12:44pm - Reply: 'Re: carb boiling'
aceinthehole Lifetime Member
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Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
 Joel, the way you come up with those pics so quickly is phenomenal buddy Thumbs Up. I don't remember seeing one before so a pic is worth a thousand words ( or at least a hundred Wink ). 

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Jimmy B.
Just can't wait to get on the road again.

 
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10/23/12 4:49pm - Reply: 'Re: carb boiling'
Norsky Lifetime Member
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Twin Lakes, CO - USA

Vette(s):
SOLD - "The Toy" - 1970 Convertible
SOLD - "The Beast" - 1990 ZR-1 (#682)
"BLKBRRD" - 1978 Trans Am, 400ci/285hp, 4 spd, Black w/black interior, Hurst t-tops

Joined: 1/23/2002
Posts: 6712
"The Toy" was having hot start issues that were solved by a Mr. Gasket set of aluminium and plastic spacers.  I used about 3/4 of the pack which insolated the carb just fine and didn't cause the air cleaner to clang on the hood.  The carb now stays just warm to the touch rather than too hot to touch with a bare hand.

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Jim Olson 

"The Toys"...!!!  Save the Wave!
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10/24/12 10:44am - Reply: 'Re: carb boiling'
laryred77
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Linesville, PA - USA

Vette(s):
1977 red coupe/T tops red int. 1999 magnetic red convertible 6 spd manual

Joined: 6/25/2012
Posts: 26
I just know I have to do something to help the hot starts and also after long ride I put car in garage I could hear gas in carb boiling so thanks for your posts.

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10/24/12 11:55am - Reply: 'Re: carb boiling'
MikeMc71
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Tucson, AZ - USA

Vette(s):
1970 White L-46 Air Roadster, 1971 White LT1 Coupe, 1971 Red Auto Air Coupe, 383 stroker, 430 HP, 2002 Millennium Yellow Auto Coupe

Joined: 10/7/2007
Posts: 341
What I did to fix this problem in my wifes car was to block the water port under the carb in the intake manifold, and it really helped. Of course, being in Arizona we really don't have to worry about too much cold, but we do worry about too much heat. I have never had to use a carb shield on a Corvette we have owned here yet, and we drive them in 100+ degree temps.

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10/24/12 1:32pm - Reply: 'Re: carb boiling'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19447
Cast iron intake mannyfolds will hold a LOT of heat in them, and transfer it to the carb. One way to help keep the heat down is to block off the heat riser passage in the intake. This might make your cold weather starts a little more aggravating, but it would also help with the fuel boiling issues. Another thing is to check the quality of the fuel...lower grade fuel will tend to percolate more easily than better quality fuels.






|UPDATED|10/24/2012 10:32:05 AM (AZT)|/UPDATED|


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Joel Adams
C3VR Lifetime Member #56    
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10/24/12 8:39pm - Reply: 'Re: carb boiling'
Almond81Vette
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Stanley, NC - USA

Vette(s):
1981, dark blue w/carmel interior. 350 stock, auto tranny, Q-jet carb, ECM box

Joined: 8/9/2010
Posts: 91
I agree with Adam on the gas we get today, with the "blend" not being no where close to what these cars were set up to use but what is one to do when they tweak the fuel as they do. Had one carb company tell me if can get pure gasoline without the ethnol and higher octane will help.......if can find and can pay the price, otherwise life is what it is. I know on my '81 since the engine compartment is packed from the factory, when been on the road and temps are up or outside air is hotter, when I stop I just pop the hood and let the hot air escape and that seems to help....but only if you can leave the hood up where ever you are stopping.

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10/24/12 9:24pm - Reply: 'Re: carb boiling'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Luckily I've never had this issue in mine. (Knock on wood.)

I do agree with Almond81's idea of opening the hood. I'm in the habit of opening the hood when I first shut it off. I do this all the time to avoid heat issues and also I think I'm saving the paint on my hood from too much heat underneath.
 
Kevin


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10/25/12 3:44pm - Reply: 'Re: carb boiling'
VikingVette
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Greer, SC - USA

Vette(s):
1978 Black with Viking mural painted under hood AM/FM/CB radio, T-top and a 2013 Cyber Gray Grand Sport Coupe, 2LT for my daily driver

Joined: 3/13/2012
Posts: 264
I too always open the hood when I park after a long ride.  A few stations here in SC are goingto 'pure gas' with no ethanol.  My C5 loves that stuff and I actually do get a little bit better mileage.  In my '78, I have no idea what mileage I get, but that too seems (probably just my imagination) run a bit better on the pure gas.  I have also heard (per Dr. Adams comments) that a ceramic, or phenolic spacer, is better than a metal spacer. 

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Warning: The surgeon general has declared that it is NOT unhealthy to smoke your competition AND I just discovered that my corvette is a hybred.  It burns gas and rubber! 
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10/31/12 4:41pm - Reply: 'Re: carb boiling'
rod7515 Lifetime Member
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Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1172
As Joel said in his earlier post, use the heat riser block off gasket set.It will probably not effect your cold starting as much as it may keep the choke from going off quick enough and could cause a rich fuel issue when cold. When I first used this gasket set I wired my choke open which made starting cold much harder but I added an electric choke kit which cured that problem.  Heres a pic of the felpro gasket Number.
Best of luck
Rodney
 
 
(large picture modified to a clickable link - Norsky)


|UPDATED|10/31/2012 1:41:35 PM (AZT)|/UPDATED|


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10/26/12 12:27am - Reply: 'Re: carb boiling'
dapperdan
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COLUMBUS, NC - USA

Vette(s):
2011 Grand Sport Coupe, 6-speed 1977 Coupe L82, 4-speed

Joined: 8/19/2012
Posts: 42
Does your ride have the original air cleaner with all of the components connected and operating?  The big air cleaner is actually a heat sink and it tends to take up some of the heat in the area of the carburetor.  Also, with the  original air intake, the carb gets cool air forced into its throat, which is always better than hot air.  If a car has an after market cleaner with none of the engineered components, the carb is getting hot air during running and the cleaner does not have the mass to act as a heat sink.  I wonder if owners who have trouble with boiling gas, have modified the car with a different air cleaner?  The original design acts to warm the car up faster, thus the carb, but the intake flap opens and the exhaust heat exchanger closes, so that the temperature is controlled as per design.  Just wonder about the addition of different air cleaners as the cause of boiling in the carb.

Another suggestion on dealing with the current gasoline (ethanol added) is the use of naphthene in the gas.  Some brand of moth balls are 100% pure naphthalene.  One of these moth balls per gallon of gas will act pretty much like leaded gasoline.  You have to crush them up to get them into the tank on the cars with the small gas openings.  This also helps with cooling the exhaust valves on cars that have the softer valve seats.


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10/26/12 3:49pm - Reply: 'Re: carb boiling'
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 372
FWIW from an internet source: 

Yes, mothballs will slightly assist the octane rating of gasoline. HOWEVER, in that grain of truth there lurks the potential for disaster. One must use very few mothballs (naphthalene only) because the ratio of carbon to hydrogen in the molecules makes for a very dirty burning fuel. Too many mothballs and your engine will load up with carbon deposits -- very bad news in the performance department.

Also DO NOT mistakenly use moth crystals (paradichlorobenzene). The chlorine atoms in this material becomes HCl upon combustion. Hydrochloric acid (HCl) is very destructive to engine internals.

Finally, unless your engine is high compression and in need of high octane fuel, enhancing the octane rating of the fuel over what is required is simply a waste of money. High octane fuel burned in an engine designed for lower octane fuel does not increase engine power.


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1973 L-82 4 spd

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10/26/12 4:20pm - Reply: 'Re: carb boiling'
laryred77
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Linesville, PA - USA

Vette(s):
1977 red coupe/T tops red int. 1999 magnetic red convertible 6 spd manual

Joined: 6/25/2012
Posts: 26
Here is an update :Installed Mr.gasket heat shield today on my '77 I couldn't be happier I went for long ride (probably last one this year) to get temp up got home pulled in garage opened hood and could actually put my hand on top of air cleaner before you could cook your supper. So thank you everyone once again for your help what a great site.

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10/26/12 4:26pm - Reply: 'Re: carb boiling'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats

Joined: 1/28/2010
Posts: 763
laryred77 said: Here is an update :Installed Mr.gasket heat shield today on my '77 I couldn't be happier I went for long ride (probably last one this year) to get temp up got home pulled in garage opened hood and could actually put my hand on top of air cleaner before you could cook your supper. So thank you everyone once again for your help what a great site.

What combination of plates did you use Question

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Dan T
 

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10/26/12 7:55pm - Reply: 'Re: carb boiling'
laryred77
Former Member
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Linesville, PA - USA

Vette(s):
1977 red coupe/T tops red int. 1999 magnetic red convertible 6 spd manual

Joined: 6/25/2012
Posts: 26
I only used 2 of the alum. plates 

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