[Shop-talk] Adding a tube into aluminum manifold

[Bob Spidell]

FWIW, 'true' MAPP gas hasn't been available for some time: 
https://en.wikipedia.org/wiki/MAPP_gas

On 9/16/2019 11:23 AM, Peter J. Thomas via Shop-talk wrote:
> Propane is more than enough for these types of rods.  Map gas only 
> burns a few hundred degrees hotter than propane, unless you use oxygen.
>
> Straight thread should be fine.  The purpose of the tapered NPT thread 
> is form a mechanical seal but since you are going to braze straight 
> thread should be fine. I sealed a radiator hole in the fins with the 
> Forney rods no leaks, so a brazing a tapped hole should be more than 
> adequate.
>
>
> On 9/16/2019 1:47 PM, Darrell Walker wrote:
>> Hi Peter,
>>
>> Thanks for the reply.  Is propane or MAP gas enough heat for those rods?
>>
>> I forgot to mention, the pipe is 5/8”.  I could drop down to 1/2” 
>> (that’s what I was going to do in the copper, then up to 5/8” with a 
>> brass hose barf).  But since I’m brazing it, would straight threads 
>> be OK?  Technically, there is a 5/8” NPT size defined, but I’ve not 
>> found any taps or dies in that size.
>>
>> -Darrell
>>
>>> On Sep 16, 2019, at 10:32 AM, Peter J. Thomas 
>>> <pj_thomas at comcast.net> wrote:
>>>
>>> Drill and tap aluminum, then solder with aluminum solder rods.  HD 
>>> carries Bernzomatic  AL3 rods, though I like the Forney Easy-Flo 
>>> Aluminum Brazing Rod sold at Tractor Supply better.
>>>
>>> On 9/15/2019 2:00 PM, Darrell Walker via Shop-talk wrote:
>>>> I’m adapting a Land Rover intake manifold for use on my TR8.  One 
>>>> thing I need to do is add a connection from the manifold to feed 
>>>> the heater.  There is a place on the manifold that will work 
>>>> perfectly.
>>>>
>>>> My initial plan was to tap the manifold for a copper fitting.  But 
>>>> will there be an issue with copper threaded into aluminum?
>>>>
>>>>
>>
>