Custom Heat Riser Location?

[jkyes]

ok what are you guys using for heat riser tubing. It appears you are using extra tubes, but I cannot seem to find them anywhere.
_________________

[mharney]

You can get them at industrial supply stores online. I get them from Mcmaster.com

[modok]

1/2 OD steel tubing
I get it from the hardware store or many of those ugly table lamps have a piece of it through the middle.

[jkyes]

do you just weld it into place? lots of the pictures show special flanges.

this is most similar to my muffler, where should I weld it into place? Am I correct, that I should move the left side(as you look from the back) not the right?

_________________

[KevinAlbrecht]

[modok]

You could have one end centered in the pea shooter, same way the stock muffler is.

But we gotta give you some flack for using that silly muffler

HA HA

[mharney]

I use 5/8" OD seamless mild steel formable tubing.

[jkyes]

Yeah I can take getting razed some... I am slowly doing the work to fix up from PO. going to get a new engine eventually, but want this one running well enough I feel like driving around. otherwise it is just going to sit in the garage until i pull together the money.

It does not have to run great, but it needs to be better then now, and I am hoping good heat to the carb will help...

5/8 or 1/2? do they both fit in the stock intake? does the 5/8 fit over the old one?

Flanges? welding?
_________________

[modok]

yeah, your right it is 5/8 tubes, musta been an extra big lamp i stole it from.

To make flanges, buy big washers, clamp them together, and drill two or three 1/4 holes through them near the edge. CUSTOM flanges!

[mharney]

You can also either reuse flanges from the std heat riser setups, or you can use the blockoff plates and drill them.

[THINGONER]

Can you weld the pipe to the exhaust just prior to it entering the muffler on the type of system shown above? Will this work? If not does anyone have a suggestion?

[mharney]

It tends to work as a draft tube.. you need velocity to make it work well. Look at a stock muffler.

[jkyes]

you guys buy a bender, or do it another way?
_________________

[mharney]

I have a bender made by Yellowjacket. I do all mine by hand with it.

[medeno]

[harleyriders1944]

i understand the theory behind one heat riser located at the #2 header location and the other has to go to the collector my ? is would it be better to just "t" into one of the heat tubes and go down to the collector since its already hooked up the way the headers came originally or do i have to weld up one of the mounts and do it the way is suggested just curious if doing it my way would hinder the heat movement

[mharney]

You need to disconnect it from the primary to get a pressure difference.

[jgrexx]

i plan on doing this but i was gonna use stainless steel braided line like that is used to run oil lines instead of welding pipe. just screw in fittings to the exhaust and into cut off heat risers and then screw on braided line. that way it would be easy to just disconnect the lines in order to remove the exhaust when working on your engine.
_________________
1970 Baja Bug
http://www.thesamba.com/vw/forum/viewtopic.php?t=520964&postdays=0&postorder=asc&start=0

[tdonaldson]

I had a cobbled together system that had flexible lines. Didn't work well. The metal/metal connection with conductive heat probably does as much as exhaust gas passing through.

The system I have now is hi to low welded in pipe on a dual cannon. I'm not sure if I'm getting as much heat even with that because the tube to the low pressure side can't conduct as much heat back into the intake (being welded in three feet further from the head it isn't as hot)
_________________
"If you had a beer can in your hand the beer would have stopped it, alcohol is a natural force of good that keeps you from getting hurt, unless you're city people...."

[cdollar]

I just did this mod on my bugpack bus header. I don't have a decent torch setup to really bend the steel tubing with tight bends so I ended up using an old 1/2" conduit bender to make some more sweeping bends. Should work nicely!