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some old lady around here was told by her "mechanics" that they had to fabricate double y joints on her f250 460ci 1979 exhaust, and charged her out the ying yang they did....as far as my knowledge goes you can use 2 inch pipe off headers or stock manifolds to what ever mufflers you want, providing there is sufficient back pressure......they said it was a "heat" issue...never heard of such a thing...so i looked under the truck and there was only a single y colllecting off the manifolds into one pipe into a stock muffler...now my question is...is there any special "voodoo" to consider when dual exhausting a propane big block?
Not that I've ever been aware of. My 89 460/propane has had duals with the factory manifolds since the first it's first muffler job. I don't know what to say man, my drivers side pipe is bent in between the flywheel cover and oil pan but I doubt that cost a whole lot. Who is the 'some old lady' and how did you get involved... if it's that gross of an injustice and they charged out the ying yang for something they didn't do then a call to the police is probably in order.
all of the dual fuel vehicles I have ever seen have a single exhaust, as far as I am aware, propane runs a shade cooler as it is more efficient. If it was a heat issue, they would require stainless exhaust, not a separate exhaust. Somebody's pulling a fast one. For an example, consider forklifts, they run inside closed buildings for hours, and the exhaust on them is the same thing you see on regfular automotive stuff, and if the exhaust was hotter, it would be hotter coming out, and OSHA would have some kind of ruling on that too, but it doesn't come out any hotter that I ever noticed...
the workhorse:86 F250 4x4 6.9 Diesel 4-spd, 4.10 axles
the other workhorse 92 F350 2wd crew cab,3.55 rear axle, 92 6bt Cummins, NV4500
the project: 78 F150 4x4 shortbed 351 auto Iowa Chapter leader, ASE certified parts specialist
Come on down and join us in the Iowa chapter, or your own local chapter!! Thanks, Roger
If you have 2 separate exhaust tubes, one for each side it's called dual exhaust.
If you add a tube connecting the two, it effectively doubles the available area for the gases to go when one valve on one side or the other opens reducing back pressure.
It does not seem like it would be much, but it is.
High performance race cars once used a double crossover tube in an "X" pattern to make the flow as smooth as possible at extremely high Rpm's.
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