manifold heat solutions and supporting temp data

[ccowx]

No, you are trying to overcomplicate this. I have simply welded a small piece of metal in so that it forms a tube down the primary pipe. There is NOTHING that you don't see in the photos, no pipes. I am going to have to post some more photos, which I will try to do later today.

Meanwhile, the pictures show the complete, functioning set up, nothing more is needed. In the second picture do you see the piece welded in? Under it is the hole that is drilled through the fitting on the header, just like the first picture. I have made a little plate that is about 1-1/2" by about 3/4". I bent the end down at the end where it covers the hole and welded it up to be sealed. At the other end downstream it is open, leaving a passage for the exhaust gas to be sucked down the system. The pressure is less, even only an inch or two farther down the pipe. Also the exhaust flowing past will pull the gases along with it, this is the "venturi effect" that has been referred to. This creates the suction needed, combined with the high pressure intake at the other end, to make the uni-directionl flow happen.

I hope that helps!

Chris

[vamram]

Thanks, that definitely clears it up. Makes it much simpler too than cutting, bending & welding tubing into the collector. For me anyway.
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'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...we hardly knew ye. Sold 2025 for peanuts.
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[ccowx]

NOW you are getting it!! KISS!

PS: I assume that you get it now, but me know if you need some better pictures, I might have something.

[Luftwagen 2180]

Like this?

[ccowx]

Brilliant!!! Thanks for posting those, much better than anything I have! And a better welder too, by far....

[vamram]

[67rustavenger]

Victor, go back and look at all the pics posted above.

On one exhaust the flow through it is being scooped into the heat riser.

On the other exhaust pic, the scoop is facing in the direction of the exiting exhaust gasses and drawing the the heated gasses through the intake manifold heater tube.

At least, that's my interpretation of the pics posted above.
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[vamram]

So in Luftwagen's picture I re-posted, the welded in metal bit is covering the TOP of the heat riser hole? I.e., it's open end is hidden because it's pointed outbound towards the collector/muffler? Whereas the welded bit on the other side is open facing the intake's heat riser?
_________________
"Men are qualified for civil liberty in exact proportion to their disposition
to put moral chains upon their own appetites. -Edmund Burke

'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...we hardly knew ye. Sold 2025 for peanuts.
Click to view image
Save the Supers!!

[67rustavenger]

[ccowx]

Looks like everyone is on the same page, at last!! Again, compliments to Luftwagen for his much finer execution than mine, and better photography skills!

The scoop in the "intake" or "high pressure" side is nice, but probably unnecessary. I took my cue from VW, in that in all of their stock set ups, the HP side is a simple 90 degree join to the exhaust primary, right at the cylinder head. While it is not actually scooping the flow, it will automatically be a high pressure area without doing anything at all. I aided the pressure side a bit by grinding down a bit of a ramp into the hole on the cylinder head side and making the downstream side as sharp or undercut as possible. The VW systems all have some form of venturi effect or lower pressure or both at the other end, which seems to be sufficient. Once there is any significant pressure differential it will start to flow, it's like water downhill, it won't go against that.

My only reason for mentioning it is that I am a minimalist(ie lazy!) by nature and the less work and the less restrictions inside my exhaust system I have to deal with, the happier I am. The system will work either way, do what feels right to you. FWIW, my temp measurements are with the suction scoop only.

Please get back to us with temp readings and if you do go two scoops, I will be curious to see if it makes a substantial difference in temperature. I have been wrong before, just ask my wife!

Thanks!

Chris