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Veteran
Location: Kingsley Michigan | I have heard--and seen many a FMC and the different configurations that everyone comes up with to solve the problems of a rear engine setup. From the stock big center muffler with it's Y pipe-- to duals on the drivers side under the gas tank--- to seperate duals like mine. The question is---why would you want to combine the 2 sides with a X pipe as I have seen in the Summit magazine setups. Is there an advantage for performance or is this for the sound? I understand the Y pipe as it helps to route the system for a single outlet either through the muffler or after---but the X???
Thanks for your input! Barn |
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Extreme Veteran
Location: Ignacio Colorado | Barn The X pipe or exhaust crossover is used to help cylinder scavanging ( The flow of exhaust in the system will suck the last of the waste gas from the cylinder and ensure a compleat refill with burnable air/fuel mixture). Older stock high performance systems use a straight pipe connecting the dual pipes. It is supposed to add about 5-10 horse power?? A Camshaft with alot of lobe overlap is to do the same thing only they pull raw fuel out into the exhaust as well, this wastes gas but gets a full charge in the cylinder for the next compression stroke. Hope this helps Bill |
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Veteran
Location: Canton, (Sixes) GA | quote "An "H" pipe, commonly referred to as an equalizer, balance or crossover pipe, connects the two exhaust pipes. It will balance the pressure of the exhaust pulses in the system, thereby reducing interior and exterior sound while increasing power. In general the "H" pipe should be installed as close as possible to the header collector. With manifolds, the "H" pipe should be laced just past where the downpipes become horizontal. "H" pipes should be the same diameter as the main pipes or no-more than 1/2" smaller." unquote. In 2002, on my beefed up small block '71 Malibu, went with Dougs ceramic coated shortie headers, Flowmaster 3 chamber 50 series mufflers and 2 1/2 inch stainless exhaust (American Thunder) with cross over. X pipe was considered, did not seem as common back then. My race engine builder guy said unless you do a lot of racing or WOT stuff, crossover was more than sufficient. I like the way it performs and sounds.. ....<3000 miles a year, I don't race it. I do think the X pipe has evolved and improved over the years.. ds |
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Expert
Location: Cottage Grove, OR | denshew - 2009-12-02 5:34 PM With manifolds, the "H" pipe should be laced just past where the downpipes become horizontal. . ds Does this mean that the exhaust pipes should go forward (or rearward) first so that the connection will be the same distance from the end of the manifold for both sides before both exhaust pipes head to the drivers side and the mufflers (if exiting that side)? |
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Veteran
Location: Canton, (Sixes) GA | Since mine is a turbo diesel and duels are not applicable, I should have avoided posting on this thread. Not familiar with the various exhaust routings from the 440 so any answer is probably going to be subjective. Perhaps the best way if still interested is to check with a muffler shop that sells performance mufflers - Flowmasters, Dynomax, Magnaflow, Cherry Bomb etc to see what they recommend or can do...ds |
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Expert
Location: Cottage Grove, OR | Denny - Your comments are entirely appropriate as we are looking for knowledge here and that means going outside of the FMC knowledge base and you have a lot of experience. It is then up the 440 users to apply that to the 440.
My next thought is that if the driver side exhaust came down and then curved under the pan and exited the passenger side and the passenger side exhaust came down and curved the opposite direction and exited on the driver side, would that confiruration allow a short connection between the two pipes right after leveling out. I need to redo my system and that is an idea I got from another owner.
What does everyone else think? |
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Extreme Veteran
Location: Ignacio Colorado | Stephen I think 2 pipes and a crossover under the oil pan is more heat than you want under it I think one pipe under the pan and then into a dual inlet muffler still brings the system together quicker than any production system with a crossover. There are pictures of the dual system (no crossover) on #902 with the low style exhaust manifolds in the photo albums. It would be easy to use one dual inlet muffler and exit under the genset on the driver side.
I don't like big vehicles with the exhaust exiting the passenger side. too much dry fire starting material on the roadside here in Colorado.
Bill |
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Exhaust crossovers---