Benefit/drawbacks of raised exhaust? - Defender Source
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  #1  
Old July 15th, 2012, 07:50 PM
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Benefit/drawbacks of raised exhaust?

Hey Folks,
I understand the purpose of the Snorkel/raised air-intake, but rarely see anyone with the raised exhaust. I've operated in HMMWVs with raised exhaust, and came across the photo of the 130 with raised exhaust and got curious. Whats the benefit? Is it necessary for deep fording? Any effects from lengthening the distance the exhaust must travel before escaping?

Dave
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Old July 15th, 2012, 08:38 PM
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Increased exhaust length = increased back pressure. If you stall while in the deep a raised exhaust will keep the water from backfilling the exhaust.
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Old July 15th, 2012, 08:47 PM
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OK - so increased back-pressure adds undue strain on the engine because it makes it more difficult for each cylinder to expel exhaust... am I correct here?
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Old July 15th, 2012, 09:17 PM
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yes and no....some engines are designed with a certain amount of back pressure. The two reasons I see for doing a high exhaust is so that you don't suck water up the pipe on a water crossing the other is to get the fumes up out of the way. People do not like following behind my diesel on the trails because of the fumes. If you get them up higher it isn't as bad.
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Old July 15th, 2012, 10:00 PM
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I saw a jeep years ago at Paragon with a raised exhaust, but he had a lever in the cockpit (it was a TJ based buggy) that directed it through either sidepipes (normally) or the raised bit (water crossings). Seemed more complicated that it needed to be but I guess a cool proof of concept?
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Old July 15th, 2012, 10:57 PM
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Quote:
Originally Posted by MC22958 View Post
yes and no....some engines are designed with a certain amount of back pressure. The two reasons I see for doing a high exhaust is so that you don't suck water up the pipe on a water crossing the other is to get the fumes up out of the way. People do not like following behind my diesel on the trails because of the fumes. If you get them up higher it isn't as bad.
I could see the advantage of having a raised exhaust in Colorado if I had a smoker!
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Old July 16th, 2012, 06:51 AM
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I've considered it, but ended up raising it about 6" and running it out the side of the rear quarter.
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Old July 16th, 2012, 09:17 AM
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At a certain point, a raised exhaust will be negated by the river's current.
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