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Aluminum hose to air-box from exh.man 700 1987

posted by  someone claiming to be Eric on  Sat Nov 25 16:30 CST 2000 [RELATED]

I removed the Aluminum hose from the exhaust manifold to the air-box because the air-flow meter was always very warm to hot.Why would you want to take the cool dense air and heat it? Why even have a intercooler? The air now enters into the side of the air-box where the hose was attached.It doesn't seem to run any different and its getting fairly cold.Whats the word on this,is it really needed? Eric 740t 115K







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    Re: Aluminum hose to air-box from exh.man 700 1987

    posted by  someone claiming to be Kerry on  Wed Nov 29 14:19 CST 2000 [RELATED]

    Eric:

    Be sure to get into your air box under the air filter and yank out the thermostat (it is the only metal thing in there). Then, glue the little flapper door closed.

    The device may have been good for driving in Sweden, but I think it is worthless in the States.







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    Re: Aluminum hose to air-box from exh.man 700 1987

    posted by  someone claiming to be Zee on  Tue Nov 28 23:13 CST 2000 [RELATED]

    Because the general consensus on this forum is this is a pollution control item chich, if eliminated, wil not affect performane, I have removed them on allmy three cars.

    I buy a $2.50 rubber 1.5" end cap at the plumbing section of my local hardware store to cap off the inlet of the air box.







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    Re: Aluminum hose to air-box from exh.man 700 1987

    posted by  someone claiming to be rl on  Mon Nov 27 10:35 CST 2000 [RELATED]

    Speaking of which, has anyone found a substitute for this hose. Volvo wants first born and 2 1/2" diameter is an odd size.







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    Re: Aluminum hose to air-box from exh.man 700 1987

    posted by  someone claiming to be John Sargent on  Sun Nov 26 03:40 CST 2000 [RELATED]

    As stated in the previous post, the aluminum hose supplies warm air to the engine when the airbox thermostat calls for it. The problem is the airbox thermostats go bad, feeding hot air to the engine at all times. This is supposed to be hard on the air mass meter, an expensive item. The airbox thermostat needs to be checked regularly, and replaced when defective.







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    Re: Aluminum hose to air-box from exh.man 700 1987

    posted by  someone claiming to be Gene Stevens on  Sun Nov 26 00:47 CST 2000 [RELATED]

    It is used to cause warmed air to enter the intake manifold to speed warmup and increase efficiency. So long as the airbox thermostat is working properly (the replacement is only about $15 from RPR and others), it's a good idea in the cooler weather - for both gas mileage and engine life.

    When spring rolls around, take it back out if you'd like. You're right about wanting colder air for an always warm engine (warm weather).







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      Re: Aluminum hose to air-box from exh.man 700 1987

      posted by  someone claiming to be Bill D. on  Sun Nov 26 03:54 CST 2000 [RELATED]

      My understanding is that is does not really inprove effeciancy or warm up time of the engine. What it does is make the combustion process hotter and the exhaust hotter a little bit sooner. This does not make the fuel burn better but, it changes the composition of the exhaust gasses to reduce certain cold ones and lights off the cat sooner to reduce pollution. I have read that as long as the air temp is 0 F. or higher drivers will not notice any advantage to using preheated intake air on a injected car. On a carb car the heat helps to vaporise the fuel and prevent carb icing. Injected cars do not use a venturi effect so icing is lees common

      Bill D.






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