Classic cars forum & vehicle restoration.

[ukdave2002]

I was looking to get a simple length of pipe to divert exhaust fumes out when I have the engine running in my garage. Thought I would have a look what is commercially available for exhast extraction and find they all have motors presumably driving fans , but cost £500 upwards!!
Am I missing something here? Is a length of tube not going to work, and even if I attached a fan can’t see why these things start at £500?

Dave

[pigtin]

Is it possible that the expensive systems are for commercial use: where the engines have to be fine-tuned on an analyser?
And a long tube would alter the characteristics of an engine.

Not sure

[Uncle Joe]

I would have expected that the expensive parts of such a system would be the fan, the flexible pipes that connect to the exhaust, the ''inlet valve'' and the two tee-connectors.

[ukdave2002]

[buzzy bee]

Hi

i was thinking of getting the same sort of thing for my garage. The comercial ones that are pulled down from the cieling are non to great, we put one on a large tractor, and melted the thing, admitadly we were doing a stall test or something, so it was on full belt.

I was just thinking of getting a length of exhaust tube and putting it over my exhaust and out of the door, may help a bit. I was thinking the flexible pipe that you put on wagons, isn't that dear.

Cheers

Dave

[Uncle Joe]

buzzy, if the thing melted, then it must have been a poorly designed system... I wouldnt expect that a length of exhaust pipe would work well enough, I suspect that it would affect the engine performance too much.

[buzzy bee]

Hi

I am not sure why it melted, but a few different ones have done that in the agricultral game, so much so they just use a pipe like I said on the exhaust now, and don't bother with extraction. As long as the pipe was bigger than the exhaust it seemed to work ok. So if you have a tractor with 200 horses or so beavering away as fast as they can don't use an extraction fan!

Cheers

Dave