beetleseventy3

I'm interested in knowing whats involved with putting j-tubes on a engine that currently has heater boxes.

 

thanks

1973 Volkswagen Super Beetle
(just about done!)
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68autobug

Firstly, You will have no heaters....

 

You just take the heater boxes off and replace them with the J pipes...

You then take off the fresh air hoses that come from the fan housing to the heater boxes... these are silver in My photo...

also pic of J pipes on engine...

 

Now, important part....

The two round vents in the fan housing have to be blocked off to keep ALL the air for cooling the engine...

 

You can usually find these at any VW parts Shop.... usually welch plugs

and its best to put at least one screw in each to stop them falling out...

 

on the other end of the heater boxes are heater mufflers...

these just pull off....  You could then use some Duct tape on the heater tubes going back into the car...

to stop anything going in thru those....

 

You should also now block up the holes in the tinware where the silver or black plastic air hoses went thru....

its important that Very Hot air from the muffler cannot get into the engine compartment....

as it will be sucked into the cooling fan.....

and HOT air will be blown over the Hot engine....

NOT a good idea....

 

I hope I covered everything....

I used J pipes on My engine until the car was ready to be road registered....

 

cheers

 

Lee Noonan      68AutoBug    Australia

 

http://community.webshots.com/user/vw68autobug

 

 

 

68AutoBug - helping keep air cooled Volkswagens alive in Australia & around the World -

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beetleseventy3

Will I still have defrosters for the front window?

1973 Volkswagen Super Beetle
(just about done!)
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68autobug

 

No, the defrosters will not work as

 

there will be no hot air from the engine  ...

 

 

Lee     68AutoBug  Australia

 

 

http://community.webshots.com/user/vw68autobug

 

68AutoBug - helping keep air cooled Volkswagens alive in Australia & around the World -

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staticattic

On the topic of J-Tubes, on my new engine, I went with a merged ceramic coated header. On my old engine, I noticed the heater boxes had a bit of cooling tin bolted to them that went underneath the cylinders. The merged headers, and I am assuming J Tubes to be the same, has no where to mount this piece of tin. Is this a necessity? Note, I am not talking about the piece of tin that snaps in between the cylinders, this piece actually went over that and the return tubes, screwed in to tabs on the heater boxes and screwed together with the top cylinder cooling tin.

 

Jeff 

Jeff
72 Super Beetle
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68autobug

Hi Jeff,

the pieces of tinware You are talking about directs the air coming from over the cylinders to pass over the pushrod tubes, helping cool them down, and then goes out the back....

I know many people don't use them... especially in Baja beetles etc..

I have not been running them on My engine, as I use type 3 cooling tins

above and below the cylinders and they make it a bit difficult to fit..

But I've been told its best to use them for maximum cooling, so as I have My engine Out at the moment, I have taken all the tinware off and am going to see if I can make the type 3 cooling tin fit better, then fit the tinware You mentioned...

 

This tinware is compulsary if You fit a thermostat to the engine....

Incidently, the J pipes I was using did have those two pieces of steel to screw to the lower tinware.. and You can buy them ....

 

cheers

 

Lee Noonan  -----    68AutoBug  ----   Australia ---

 

http://community.webshots.com/user/vw68autobug

 

68AutoBug - helping keep air cooled Volkswagens alive in Australia & around the World -

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NoH2O

Hey Lee, I tried the same thing on an engine I built for a rail buggy. The type 3 tins that go under the cylinders that is. They are marketed as super cool tins here in the states. I did a lot of research and decided against them and went with the regular type 1 set up. The type 3 lower tins are designed for a horizontal fan set-up and supposedly do not cool as well with the upright fan shroud. I saw where Jake Raby did a test on them and found them to be obtrusive to air flow. I had my engine on a stand so it was an easy swap back to type 1's. I was just wondering if you've noticed any difference at all. I know your summer temps are probably a bit warmer than here in the MidWest. I've heard it both ways, some say it works others say it's not a good idea. I was wondering what you thought about it.

 

Steve

'63 Ragtop
'56 Ragtop
'78 Riviera camper


"..at least I'm enjoyin' the ride"
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68autobug

Hi Steve,

Well I don't really know..

I haven't driven My car much in the summer but it was getting very hot due to the rear fiberglass valance unit not sealing up to the engine so all the hot ait from the muffler and engine has been able to be sucked in by the fan...

I remedied this by fitting deck lid openers at the top...

this makes a Huge difference to the air temp in the engine bay...

I could touch anything and it wasn't hot....

normally eveything is too hot to touch....

 

I have the engine with tinware off at present and checking to see no paper or cloth was under the tinware....

I also found My preheater heatriser pipe has been leaking badly but I didn't notice...

I fixed all these problems now... and was just going to take the cool tinware off and grind bits off so it fits perfectly...

I have only heard good things about the type 3 cool tin...

Marc Vallet tells Me He always uses it on drag engines etc..

I don't really think it matters where the air comes from as it can't go anyplace else... lol...

 

The only thing I don't like is My cool tin is chromed and not plain metal.

I read recently where VW had a Very cold climate kit out in the 50s-60s and the Tappet covers were chromed, to keep the heat in....

 

cheers

 

Lee Noonan ---   68AutoBug  ---  Australia ---

 

 

http://community.webshots.com/user/vw68autobug

 

68AutoBug - helping keep air cooled Volkswagens alive in Australia & around the World -

http://community.webshots.com/user/vw68autobug
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68autobug

Hi Jeff,

 

I realise You cannot weld new tabs on Your ceramic coated headers...

Maybe You could use clamps of some kind...

 

 

Lee Noonan  --- 68AutoBug  ---  Australia --

 

http://community.webshots.com/user/vw68autobug

 

68AutoBug - helping keep air cooled Volkswagens alive in Australia & around the World -

http://community.webshots.com/user/vw68autobug
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NoH2O

Lee,

6 of one, half a dozen of another I guess. lol!!

I figured I'd see how it was working for you in those Aussie summers. I happened across a few articles that made me want to investigate further on the matter when I started on my rail buggy engine. Like you said your buddy runs them in his drag cars, and I've seen guys who won't touch the things. I was trying to get more input for my own satisfaction. lol! There doesn't seem to be any definitive answer here.

The difference with the fan placement, horizontal vs. upright, made sense to me. The cool tins let the air out of the bottom more so with the air originating from overhead, whereas with the type 1 tins, more air is forced over the tins. That's the way I understood it anyway.

Your car is looking good as always Lee. I wish I had half the time you did to tinker around. Seems like everytime I turn around you've got that engine out. lol!

 

Steve

 

'63 Ragtop
'56 Ragtop
'78 Riviera camper


"..at least I'm enjoyin' the ride"
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