canuckxxxx's Single carb manifold build

[canuckxxxx]

Ok so I changed my mind about returning the coolant at the T stat. I think if I put a "T" where the fan switch thing goes the flow might be very low and the cooler liquid from the plenum might keep the fan from coming on.

So I spent the morning working on an return down by the pump suction. This is my original idea that I had using a 1/2" thick plate between the hose spigot for the pump and the pump cover with a 3/8" hole drilled through and a 1/2" OD, 3/8" ID tube welded on for the hose up the plenum. It turns out that with the plate added the spigot from the pump and the spigot from the radiator line up pretty good without having to move the radiator.

I bought a car rad hose a long time ago to cut the upper and lower rad hosed for the GW and I still had some left over. So I cut out a curved section and it fits real nice.

I know you guys like pics.

Brian

Spacer plate

hole to inside of plate 2

• canuckxxxx
• Jan 23, 2014

hole to inside of plate 1

• canuckxxxx
• Jan 23, 2014

Bolt holding tube for welding

return plate 1

• canuckxxxx
• Jan 23, 2014

With spigot on top

plate with spigot on top

• canuckxxxx
• Jan 23, 2014

On engine

how spigot lines up with rad with return plate 2

• canuckxxxx
• Jan 23, 2014

How it lines up

how spigot lines up with rad with return plate 1

• canuckxxxx
• Jan 23, 2014

With rad hose in place

how hose fits with return plate

• canuckxxxx
• Jan 23, 2014

Rad hose I used

hose

• canuckxxxx
• Jan 23, 2014

 

[joedrum]

good stuff brian ...

 

[canuckxxxx]

Thanks Joe. I should also add that I now have a hole in the back of my centre coolant chamber with 1/4" NPT threads. If you look closely at the hole you may think that it looks like thick metal there. What I did was JB weld a 1/8" disc on the inside and then drill and tap the hole. The metal on the end, by itself, seemed pretty thin for cutting threads into.

I think I will get better flow with the return at the pump because this is the location of the lowest pressure in the whole cooling system; it is the lowest static head and low because of the pump suction. So the difference in pressure between the back of the coolant chamber, where I am taking coolant off for the plenum, and this return location will result in max flow (I hope). :music:

Also, this is the route that Dan used and got good results and I will use 1/2" hose like Dan did.

Brian

hole in back of centre coolant chamber

• canuckxxxx
• Jan 23, 2014

 

[canuckxxxx]

I took my plenum and plate to close in the bottom to a welder yesterday so should have back next week. Then should be able to put the whole thing together for the last time (yeah right). :salute:

Brian

 

[joedrum]

yah that's dreaming ...absolutely the last time :smilie_happy: .... I like what your doing :builder: good work you guys must be tough up there ..I cant hardly get out of the house its so cold :fiddle: :mrgreen:

 

[dan filipi]

Good progress Brian!

Though I would have liked to know how well coolant flows when tapped into the fan switch hole, I think you made a good choice.

 

[canuckxxxx]

dan filipi » Thu Jan 23, 2014 5:39 pm[/url]":2xt4yr95]
Good progress Brian!

Though I would have liked to know how well coolant flows when tapped into the fan switch hole, I think you made a good choice.

It would have been interesting to see how that would have worked or how the aluminum casting would have heated the plenum. But I will be happy to get this thing wrapped up and running good using proven methods.

Brian

 

[Ansimp]

Nice work :good:

 

[Dusterdude]

Too damn cold here too


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[canuckxxxx]

Have any of you guys found a good source of the carb-to-plenum gasket? Like the gasket from an '84 Escort or something like that. Taking this thing apart and putting it back together so many times I finally broke the gasket that came with the manifold.

Brian

 

[slabghost]

You can cut one from cardboard like on a cereal box. That will work fine until someone (maybe you) gets the right bumber for the gasket. I've seen them for sale on ebay but never thought to save a link.

 

[dan filipi]

I've been cutting them from the thick gasket that comes in a roll. Got it from Pep Boys for about $10.
Make sure it says for carb, that's the thicker stuff and works well compressing for a good seal.

 

[Dusterdude]

Or buy one from an auto parts store


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[dan filipi]

Dusterdude » Sat Jan 25, 2014 4:15 pm[/url]":2hjmro1f]
Or buy one from an auto parts store


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Yes there too I'm sure.

The roll worked good for making flange and adaptor gaskets too and it's thicker to compress better than the gasket that came with the carb.

 

[canuckxxxx]

Well I finally got my parts back from the welder. It took a while but he did a great job.

The plenum closed in with 3/8" NPT hubs.

coolant chamber 2 welded

• canuckxxxx
• Feb 6, 2014

coolant chamber 1 welded

• canuckxxxx
• Feb 6, 2014

The spacer plate with a 3/8" ID, 1/2" OD fitting to return the coolant to the pump suction

return plate 1 welded

• canuckxxxx
• Feb 6, 2014

So I will go to work putting it all together and getting it running again. I haven't bought any barbed fittings or hose yet because I want to put the manifold on the bike and see how things line up first.

Brian

 

[dan filipi]

Very nicely done!

 

[ekvh]

Looks good. Really good. If you don't mind, how much did that set you back?

 

[canuckxxxx]

ekvh » Thu Feb 06, 2014 4:15 pm[/url]":3mxxojt2]
Looks good. Really good. If you don't mind, how much did that set you back?

It was not cheap...the welding was $130.

 

[dan filipi]

The flange return for coolant...........very smartly done. I salute you :salute:

 

[joedrum]

hmmm that is nice and just as I see it ... done right ... I like the way it hits everything with the least amount of volume this is going to flow nice real nice ...sheesh I want mine to get like that ...