Mapp gas

[InsanePyro]

Is it worth it? I broke my propane torch over the weekend at the junkyard so naturally I'm looking for a replacement (because fire is fun! ) In all seriousness I'm trying to get a leaf spring bolt out on my Bronco and was told to roast out the bushing and then the bolt should be freeish. A sawzall even with the best blades doesn't scratch it much. It's either a grade 5 or 8 bolt by the way. So I'm just wondering if in both the long or short run if Mapp is worth it. And can it be ran in the normal torch attachment that are commonly used with propane or does it need its own attachment? What about these mapp/oxy setups I see?

 

[MrMark]

Mapp is only about 50 degrees hotter than propane with a Bernzomatic ts400 torch. Not a big deal. The torch head is much more important than mapp or propane.

 

[InsanePyro]

So what makes a good one?

 

[MrMark]

The way the torch swirls the air with the fuel. The TS400 is a good torch head and affordable. Lenox makes a bunch too. The TS400 takes either propane or mapp so you can try both out. I've only used it with Mapp but I did read the specs to see that propane would work almost the same.

 

[InsanePyro]

Have you ever used or heard anything about the mapp/oxy cutting torches?

 

[Big-Foot]

In most states you can't even buy REAL MAPP gas as it is no longer being produced.
They have managed to come up with a substitute that burns barely (in my opinion) hotter than propane. Now they still use the familiar yellow cylinder, but you'll find that they have changed the name to something like MAP/Pro etc..

http://en.wikipedia.org/wiki/MAPP_gas

 

[InsanePyro]

Well the map/oxy setups can use propane as well I believe so all the same I guess

 

[Trey T]

Didn't even realized the changes.

I had left over mapp gas from mid-2000 and tried it on my outdoor/camp lantern, it was extremely hot. Never try the mapp gas again on the lantern.

 

[InsanePyro]

From what I've been reading the oxy/mapp setups are pretty useless and short lived. I think I'd be better off just getting the good single attachment?

 

[kd4gij]

From what I've been reading the oxy/mapp setups are pretty useless and short lived. I think I'd be better off just getting the good single attachment?

I had a map/oxy setup. The red oxy cylinders last maybe 5 min tops. Prity much usles. And I tryed to use it with the Smith little torches and still usles.

 

[InsanePyro]

Well then it would seem the best route to go would be get the attachment MrMark mentioned

 

[firebox40dash5]

FYI, usually the bolt is siezed into the inner bushing sleeve... so when you burn the bushing out, the bolt can turn (to hopefully get the nut off) but then you still have to wrangle with getting the sleeve off the bolt to get it out of the holes. I usually just grab the sawzall and cut on either side of the spring, between it and the hanger. I'd be more worried about the sleeve being hardened than the bolt grade, I've never had an issue hacking up any normal kinda bolt. Don't forget the anti-sieze on the way back in!

I have MAPP torches, they work for little stuff that's 'sorta' stuck, but when it comes to big, really stuck things, it just pisses me off.

 

[InsanePyro]

I've tried sawzall with the best blades I could find (they're blue...I forget what the hell they're called) but they went through a Bronco frame in the junkyard over the weekend. But it just scratches the bolt and sleeve. The nut is off but the bolt will not move. Looks like I'll be burning the dang thing

Said bolt
https://sphotos-b.**.fbcdn.net/hphotos-snc6/208723_10151567960455281_1212972059_n.jpg
https://sphotos-b.**.fbcdn.net/hphotos-ash3/601963_10151579990815281_1689260720_n.jpg

 

[firebox40dash5]

Borrow an oxy/fuel setup, burn the head off and cut the tip off. Have a friend pry the spring eye down while you're cutting, and put something under the axle to catch it.

 

[Orangestang]

Try using a cordless mini 4 1/2" grinder with a cutoff wheel and extra batteries.

 

[premierplayer]

Borrow an oxy/fuel setup, burn the head off and cut the tip off. Have a friend pry the spring eye down while you're cutting, and put something under the axle to catch it.

^^ This, the blue wrench is your friend.

 

[Dustball]

I've tried sawzall with the best blades I could find (they're blue...I forget what the hell they're called) but they went through a Bronco frame in the junkyard over the weekend. But it just scratches the bolt and sleeve. The nut is off but the bolt will not move. Looks like I'll be burning the dang thing

Said bolt
https://sphotos-b.**.fbcdn.net/hphotos-snc6/208723_10151567960455281_1212972059_n.jpg
https://sphotos-b.**.fbcdn.net/hphotos-ash3/601963_10151579990815281_1689260720_n.jpg

Cut-off wheel on an angle grinder is what you need.

 

[InsanePyro]

The way the torch swirls the air with the fuel. The TS400 is a good torch head and affordable. Lenox makes a bunch too. The TS400 takes either propane or mapp so you can try both out. I've only used it with Mapp but I did read the specs to see that propane would work almost the same.

Do the normal ones not do that?

They're just so much cheaper then the one you mentioned

 

[firebox40dash5]

^^ This, the blue wrench is your friend.

Until you blow the blue across that burning rubber, anyway.

Does look like there's room in there for a cutoff disc without tearing stuff up too bad, though.

 

[InsanePyro]

Well I don't have the money for one of those so it really doesn't matter

 

[Subyroo651]

Yes there is a difference in the flame pattern between those torches. The Benzo site probably explains it further.

 

[Big-Foot]

I've cut those bolts before with a good Milwaukee brand Bi-Metal Sawzall blade and a can of WD40 spraying on the blade to cool it while I cut it. They can be a *******, but they can be cut.

 

[skruft]

Would it help to jack the spring up and down?

Did you try putting nuts on the end and banging on it?

 

[InsanePyro]

That chunk there is all thats left. The leaf split in half. I've have been whaling on it for days.

The bolt can now be spun inside the bushing. The problem now is the bolt is still seized to the sleeve therefore can't come out the hole.