Custom Heat Riser Location?

[oprn]

Good thread!

I have no idea why it didn't show up when I did a search prior to starting my thread on this subject. There is one thing missing here though and that is the follow up data. All these ideas are great but without follow up temperature readings on the intake manifold it is all just theory.

Can we get some real data from you fellows please? At this point it all ends in the "It's working great" black hole of knowledge. Ya it works great but... what is great? Give us the temps PLEASE??!!!
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[modok]

Maybe yes, It's plausible that it could.

[APPLEGREENVW]

Does this cheap exhaust system have the correct, positive pressure flowing down to the negative side to get enough heat in the stock intake manifold?

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[busdaddy]

Bigger is always better, but when done right it moves so much exhaust gas size doesn't make a big difference, it still gets super hot where it matters.
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[walter kandetzki]

Old thread but do I need to use 5/8 or 1/2 tubing?about to do this to my old bug pack header that’s going on my superbug with stock 34pict carb.thanks

[modok]

me too. I think it worked, exhaust definitely came out.... but it flows both ways, so pulls in cold air.

[Krochus]

At one time I tried pulling exhaust out of the #4 and dumping it to the lowest pressure area possible the atmosphere with a lawnmower muffler

Did not work at all


Without scavenging there is no point in heat risers. The aftermarket exhaust where the riser just goes between 2 & 4 are less than useless

[modok]

Where you re-locate the other end of the heat riser is not a big deal.

Believe it or not, anywhere BUT the opposite exhaust pipe will work better.

[Agent47]

[Agent47]

[Maxdog2]

I know this is an old thread, but a read a lot to learn new things. One question I have is do you drill a hole in the collector and then weld your tube or just weld the tube to the collector?

Thanks,

David

[JT Bryan]

my take on fixing the problem..

[Axitech]

I just got back from installing heat risers on the rail. I was unsure if I could weld to the pipe on the Tri-Mil so I didn't want to take a chance and screw up a perfectly good exhaust. I figured, mount it at the tailpipe and if you screw it up, you can cut it off and it won't look horrible. Besides, at that point, I get hot exhaust from all four cylinders, positive pressure flow, and I can just dump the other side out the back because it's already muffled. Pics of the work. I used cutoff pieces from an old single port manifold and a couple pieces of 5/8" .120 wall tubing.

I still want to get a gasket in the flange connection (didn't have one). And I want to wrap the supply side with insulation to keep it as hot as possible into the manifold. Preliminary results: idling in the driveway. Yesterday, icing evident on side of manifold, Today. manifold is cool to the touch, but no ice at all. I will get some road test results hopefully after dinner. The pic of the pipe next to the oil filter is the 'exhaust' side of the heat riser circuit. it looked so cute, puffing little steam as it was warming up, just like it's Daddy on the other side! Bwahahahahaaa
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[JabaDubRider]

[[email protected]]

buy

http://vwparts.aircooled.net/Pre-Heat-Riser-Block-Off-Kit-Pair-2501-p/2501.htm

and drill a hole in the middle.
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[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!

[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)
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[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.
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[mharney]

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