Exhaust Fume

[ben3929]

I am working on a project to install a vehicle exhaust removal duct system in car repair shop. if possible i have a question, how much exhaust fume does a vehicle produce while the engine is running in CFM eg. pickup F150.

 

[miningman]

well if its a 6 litre engine running at say idle , approx 1000rpm , I would think that there would be close to 6000 litres of exhaust every minute. If its a 3.9 litre engine running at say 2000 rpm , I would expect 5800 litres per minute. The conversion from litres to cu feet should be self evident for any engineer.

 

[miningman]

doh!!! 3.9 times 2000 is of course 7800

 

[SomptingGuy]

There is more to it than swept volume multiplied by revolutions per minute. Like 4-stroke operation, throttling, temperature, combustion products. This topic got quite a beating some time back:

http://www.eng-tips.com/viewthread.cfm?qid=104735

- Steve

 

[Compositepro]

Half that for a 4-stroke engine. There will be contraction of volume as the exhaust cools. Exhaust will expand in volume as the exhaust pressure reduces leaving the cylinder.

 

[GregLocock]

miningman is assuming (a) full throttle operation (b) two stroke (c) room temperature exhaust

(a) and (c) more or less make up for (b) I suspect.

Also be aware that if you use a non contacting funnel as a connector there will also be entrained air.

Cheers

Greg Locock


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