Fixing a hole in TB butterfly

**allencr** · 04-07-2010, 06:26 AM

Solder it, epoxy it, whatever it, a small bevel on each side will make sure it stays in place.
Don't remove the plate from the shaft unless the screws can be removed & replaced without damage. Take your time adjusting its position before you finally tighten it to the throttle shaft, let it snap shut without binding in the bore when the screws are partially tightened.
What if it doesn't run any better, but worse?

**Cuzzo** · 04-07-2010, 10:37 AM

What throttle body is it?

**TERRA Operative** · 04-07-2010, 06:31 PM

Can I ask what you've done to the down pipe to the supercharger to make it fit?

Also, braze is what I'd be doing.

**airfireman1** · 04-07-2010, 06:47 PM

If you are using MAP gas go on buy a stick of PHOS COPPER. It is 100%better than solder as it is not brittle, bonds exceptionately well to brass and will fuse with the heat from your map gas torch.

Cheers

**Drifty Midship** · 04-07-2010, 06:52 PM

theres an adapter/reducer turned up from a block of alu joins the tb and j-pipe.
i got the tb, adapter and j pipe all as one assy and havent had it apart cause i didnt wanna re-seal it.
reduces back to the diam of factory j-pipe inside as far as i can see nothing else done.
the aw11 it came off was making 125rwkw but he wanted his idle control back.

**Mr Ed** · 05-07-2010, 11:26 AM

Originally Posted by oldcorollas

LOL at weld....
milled? they are cut from sheet...

back from holiday eh ed? or is it school holidays?

Brazing isnt a form of welding now? I must have missed the memo.

I actually am on holidays. Thanks for caring.

**big_zop** · 05-07-2010, 11:54 AM

Welding takes the metals being joined beyond their melting point, brazing does not.

**Mr Ed** · 05-07-2010, 12:57 PM

Which one is braze welding?

**Hiro** · 05-07-2010, 01:02 PM

Originally Posted by big_zop

Welding takes the metals being joined beyond their melting point, brazing does not.

^This. Brazing is more akin to soldering than welding, you heat up a filler to just past liquidus and then it gets "sucked" ever so slightly into the parts to be joined (wetting), and then cools into a solid joint. Welding melts the filler and the parts to be joined, mixes them all together (coalescence), and then solidifies into one solid blob.

Originally Posted by Mr Ed

Which one is braze welding?

Braze welding is still brazing. The base parts don't reach melting temperature.

**Mr Ed** · 05-07-2010, 01:19 PM

Fair enough. Due to incorrect terminology, my suggestion was therefore completely wrong and the OP should definitely put a bolt/rivet through his throttle butterfly instead.

**oldcorollas** · 05-07-2010, 03:57 PM

random definition

Brazing is a process for joining similar or dissimilar metals using a filler metal that typically includes a base of copper combined with silver, nickel, zinc or phosphorus. Brazing covers a temperature range of 900ºF - 2200ºF (470ºC - 1190ºC). Brazing differs from welding in that brazing does not melt the base metals, therefore brazing temperatures are lower than the melting points of the base metals. For the same reason, brazing is a superior choice in joining dissimilar metals

that Phos copper stuff is sort of half and half.. the phosphorus (and boron in some braze materials) can diffuse quickly into the substrates and lower their melting points temporarily (until the P or B diffuses away).
the phos copper melting point is not so low tho.. (dependign on alloy)http://www.uniweld.com/catalog/alloy...hos_copper.htm

this is called "transient liquid phase bonding" (TLP) and is halfway between brazing and welding...

so you have, in order of temp
solder (tin/lead or lead free base ~250-350C?)
silver solder (high temp soldering ~400-500C?)
silver/phos copper/etc braze (low temp brazing (500-700C?)
brazing..

etc etc

welding...

edit: ona similar note, plastic welding is weldign cos the base materials also melt.. dunno if there is plastic brazing