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MAP Gas not hot enough ?

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MAP Gas not hot enough ?
#1
notyet-MG Avatar
notyet-MG Steve LaPaugh
Newport News, VA, USA   USA
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1977 MG MGB
Is MAP gas hot enough to remove studs from the exhaust manifold that connects to the down pipe? I've gotten the stud cherry red but manifold is another story. I don't have an oxy/acetylne torch.

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Re: MAP Gas not hot enough ?
#2
CederholmC Avatar
CederholmC Carl E. Cederholm
BROOKLYN, NY, USA   USA
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1953 Chevrolet Bel Air "The Sled"
1969 MG MGB GT "Supercharged"
1972 MG MGB "Brooklyn B"
1981 Toyota Land Cruiser
Don't heat the stud! Heat the manifold surrounding the stud. The idea is the get the metal around the stud to expand.

~ Carl

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Re: MAP Gas not hot enough ?
#3
Benny Avatar
Benny Ben E
San Diego, CA, USA   USA
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1964 Ford Cortina
1964 Land Rover Series IIA
1965 Ford Cortina
1965 MG MGB    & more
Also, soak the studs in something like PB Blaster for a week or so before attemptin to remove.

Spray them morning and night, and let it do its thing....patience will be rewarded.

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Re: MAP Gas not hot enough ?
#4
dipstick Avatar
dipstick Kenny Snyder (RIP)
La Center, WA, USA   USA
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1941 Ford N-Series
1958 MG MGA 1500 Coupe "Rosie"
1970 MG MGB GT "Pat's GT"
1971 MG MGB "Gifted To Me"    & more
MAPP fuel gas is actually hotter in some areas of the visible flame envelope than acetylene. The blue tip cone is about 400*F hotter with acetylene, but the total heat contained in the remainder of the envelope is hotter with MAPP which is why MAPP is popular for heating applications. Considering that steel melts at about 2750*F and shows visible color at 900*F MAPP produces plenty enough heat.

There will be a quiz in the morning. devil smiley


Be safe out there.
Kenny


Attachments:
MAPP.png    36.1 KB
MAPP.png

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Re: MAP Gas not hot enough ?
#5
Bankerdanny Avatar
Bankerdanny Daniel Palmer
Chicagoland, USA   USA
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1972 MG MGB GT "Dudley"
1976 Honda MC CB750F
According to John Twist's video on replacing manifold studs a MAPP torch won't heat the flange enough to remove the stud.


Endeavor to Persevere

"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

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Re: MAP Gas not hot enough ?
#6
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spikemichael Platinum Member Michael Caputo
Canton, IL, USA   USA
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1973 MG MGB "Freebie"
1973 MG MGB
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try dry ice on the stud? (NOT the manifold)


Michael J. Caputo
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Re: MAP Gas not hot enough ?
#7
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Sinewave T. Keith Vezina
Kenner, LA, USA   USA
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In reply to # 2748972 by dipstick MAPP fuel gas is actually hotter in some areas of the visible flame envelope than acetylene. The blue tip cone is about 400*F hotter with acetylene, but the total heat contained in the remainder of the envelope is hotter with MAPP which is why MAPP is popular for heating applications. Considering that steel melts at about 2750*F and shows visible color at 900*F MAPP produces plenty enough heat.

Is this data for an oxygenated flame? I believe the OP is referring to a plumber's torch without an oxygen bottle.


T. Keith Vezina
British Motoring Club New Orleans
1976 MGB, 1976 MGB Trailer & 1978 MGB V8

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Re: MAP Gas not hot enough ?
#8
notyet-MG Avatar
notyet-MG Steve LaPaugh
Newport News, VA, USA   USA
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1977 MG MGB
Ok thanks. I'm using one of those MAPP gas things you get at the hardware store.

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Re: MAP Gas not hot enough ?
#9
bobmunch Bob M
Ontario, OR, USA   USA
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double check the stud holes in the manifold. It would not be the first time someone tried to weld or braze the damned things in place from the open side of the threaded hole. Sounds weird, but folks will do some of the darndest things to keep things together - often just to get a car sold. Soaking in PB Blaster or GM's Heat Riser solvent/lube (see below) for a few days is a good idea. You may even then need a stud removal tool like the one shown in photo # 2.



Edited 1 time(s). Last edit at 2014-07-23 02:25 PM by bobmunch.


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boeshield GM heater valve lube.jpg    41.6 KB
boeshield GM heater valve lube.jpg

kd1708.jpg    19.2 KB
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manifold1aa.jpg    40.4 KB
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Re: MAP Gas not hot enough ?
#10
dipstick Avatar
dipstick Kenny Snyder (RIP)
La Center, WA, USA   USA
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1941 Ford N-Series
1958 MG MGA 1500 Coupe "Rosie"
1970 MG MGB GT "Pat's GT"
1971 MG MGB "Gifted To Me"    & more
"Ok thanks. I'm using one of those MAPP gas things you get at the hardware store."

I thought those cylinders are propane.


Be safe out there.
Kenny

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Re: MAP Gas not hot enough ?
#11
Bankerdanny Avatar
Bankerdanny Daniel Palmer
Chicagoland, USA   USA
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1972 MG MGB GT "Dudley"
1976 Honda MC CB750F
MAPP is available in the small cyclinders too.


Endeavor to Persevere

"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

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