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pressure tap on exhaust

Old 03-06-2005, 10:10 PM
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SupaG
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Default pressure tap on exhaust

I'm finishing up a dumas hawk outrigger. The pictures show no pressure fitting from the exhaust to the tanks (dual tank). Should there be one? The pipe seems too thin to thread into, i'd have to weld it.
Old 03-06-2005, 10:23 PM
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Ron Olson
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Default RE: pressure tap on exhaust

Yes, there should be one and your'e going to need it with dual tanks. It doesn't have to be big. Jim Irwin recommends using the smallest one that Du-Bro makes, part No. 215 if I'm right. If there isn't enough to tap into, you can also add some JB Weld to help hold it in place.
Old 03-06-2005, 10:47 PM
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Default RE: pressure tap on exhaust

on the pipe, it flares out after the header, then tapers down to the tip ( standard boat tuned pipe). Does it matter if the fitting is before or after the flare? Is there a certain distance i should have it from the header to let the exhaust cool? etc.

thanks
Old 03-06-2005, 11:00 PM
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Default RE: pressure tap on exhaust

Put it just forward of where the cones meet. Don't worry about the heat.
The fancy names are the convergent and divergent cones.
Old 03-06-2005, 11:13 PM
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SupaG
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Default RE: pressure tap on exhaust

well as long as you brought it up.... which cone is which?
Old 03-06-2005, 11:19 PM
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Default RE: pressure tap on exhaust

You would ask, wouldn't you! The convergent cone should be the rear one.
Old 03-06-2005, 11:25 PM
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Default RE: pressure tap on exhaust

convergent "should" be the rear one? is that as long as the pipe isn't on backwards? [sm=confused.gif]
Old 03-06-2005, 11:41 PM
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Default RE: pressure tap on exhaust

Whatever one is on the back would still be the convergent cone. From my school days, many, many moon ago, converge would mean to meet, diverge would be like divulge, to give or let out.
Old 03-07-2005, 11:58 PM
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Default RE: pressure tap on exhaust

I might have gotten it backwards. I the latest issue of RCBM, Tony Castronovo has and article in there on tuned pipes and gives the parts of a pipe in there. I left it at work in my toolbox and forgot already which is which.[sm=confused.gif]
Old 03-08-2005, 12:03 AM
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SupaG
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Default RE: pressure tap on exhaust

i think somebody may need to divulge or "give away/put down" the pipe [sm=RAINFRO.gif] just kiddin....you guys know i appreciate all the help around here
Old 03-08-2005, 12:05 AM
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Default RE: pressure tap on exhaust

P.S. - I tapped the pipe tonight ( no pun intended) and threaded in a pressure fitting. With lots of lock-tite, it seemed to tighten up enough. I was trying to find that breaking point before that 3/4 of a thread stripped out.

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