79 GW EFI Project

[kb0ou]

Ericheath,
How did they glue them back on???



What glue ????

John C. kb0ou

[Whiskerfish]

Everything I have read says do not mess with the seal on that side. I have researched this before and the factory process was similar to vulcanizing and was actually an attempt to bond rubber to aluminum I believe. I read somewhere where it was described as a chemical process using heat as a catalyst.

I know it is not ideal but doesn't JB Weld make a product for aluminum as an alternate to welding? I used some to repair cracks on a engine case last year and it did a fine job.

Either way kb0ou I would replace that one with the loose rubber.

[ericheath]

I searched to find it the posts of someone who said they had taken them off, but no luck. I will try again tomorrow if I get more time. I played with some Harbor Freight magic aluminum-hocus-pocus rods last night. They look good, but are basically glue. I didn't get any penetration of the aluminum. A slight twist with some Vise-grips and they broke. Maybe I didn't prep enough and the destructions say something about breaking the surface tension on the skin of aluminum, but I didn't get any strength. Will try some more next week. Keep us posted if you have better luck. I have a bunch of intake runners to practice on, but will use other scrap aluminum until I find something that seems to work. I just don't have the money for a true TIG for aluminum.

[taunusrainer]

I think Taunus said the guy who welded his kept the rubber submerged in water to keep them from heating.

Yes, that is right, I wasn't there when he welded the bungs on, but he said he had dipped the rubber into cold water.
Now that I see how these are becoming loose I agree that they might cause a lot of troubles, which are looked upon as carb or ignition problems.
Will do the propane check frequently.

[kb0ou]

UPDATE!!!!

Yes I have been busy
I am trying using JB Weld to install the Injector Bungs in the Honda Manifold Adapters.....



And this is an example
Looks like it might work

John C. kb0ou

[kb0ou]

Here is an adapter looking inside, it still has the bolt holding the bung for setup of the JB Weld

[kb0ou]

Here is a picture of the first adapter I did, notice the JB Weld ran some on the inside.
It almost got to the screw for the port in the manifold adapter!!




Here is a nice pic of the inside,, even shows a drop of oil in the bung, I oil it before I pull the bolt, it is tight and I don't want to score the inside too much.

[kb0ou]

This is the first adapter I worked on, it is the one I tried to weld and heated up a lot, the rubber pulled loose, I glued it back

I used hot glue, I checked the temp for hot glue gun and it is about 300 degrees F.
I think it might hold.
You do really have to clean up the area you want to glue with a wire brush before glueing for it to work.
The rubber does not pull loose now.




Well that is it for now, I still have 2 more manifold adapters to finish, then I will move on.

See Ya,
John C. kb0ou

[ericheath]

Looks like it would take a good welder with a top-end machine to be able to weld those elbows with aluminum. I have a cheap TIG and it isn't cutting it. I am going to try the magic aluminum from horror freight and then use JB on top of that. The magic stuff flows on real nice, looks pretty, but it doesn't hold Jack. The biggest downside of the JBWELD is that it looks like JBWELD.

[alan hawke]

John here's a link to a company here in OZ that sell these low heat alloy brazing rods , "Weldalloy brazing rods" are what their called. They may be the thing for welding those tubes in with out loosening those rubbers. I keep a packet or two on the shelf for those odd little jobs , and have found them to work very well. Best thing is all you need is a propane torch to weld with them.
http://www.alferrante.com.au/weldalloy/faq.htm

[kb0ou]

Alan,
I tried the magic aluminum brazing rods.
380 deg C. is over 700 deg. F, same stuff, it is still too hot for the rubber carb adapters.
I am thinking of making a manifold that goes all the way from the head to the throttle body.
All aluminum. I might split the tubing about where the honda manifolds end and use some kind of rubber tubing to connect to the rest of the manifold for easy install and to allow easier use with the 1200 bikes (they are about a cm longer between right and left ports.
I might do that after I get my bike running on what I have at hand now.

Just dreamin'

John C. kb0ou

[kb0ou]

Ericheath,
yea, I have mig wire feed welder, need a bottle of Argon.
I think I am going to do some serious aluminum welding before long on some manifold ideas I have.
Just gotta get my bike running on the 4 injectors first.
It is running great on the Pic-30 but I just can't help myself,
gotta fix it even if it ain't broke.

See Ya,
John C. kb0ou

[gregforesi]

For your prototype effort why not stick with the JB weld? It ain't purty but it should work in the short term. Maybe use some chopped fiberglass as fill.

(Aluminum has such great heat transfer that welding one end heats up the rest of the workpiece significantly.)

[FirstYearDeek]

You can machine JB weld without too much chipping. As long as your tool is sharp it should go fine. It also sands nicely and I've used it to smooth out welds on powdercoated parts so I know it can take some heat.

That intake is a thing of beauty, John! Way to go!

-Deek

[lcallison]

Good luck with it John. I check this about every day.