[Shop-talk] Adding a tube into aluminum manifold

[Peter J. Thomas]

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?
>>>
>>>
>