Classic cars forum & vehicle restoration.

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The time has arrived for me to construct a garage exhaust system, I want to have a fixed pipe through the wall and just use a flexi to join vehicle exhaust to fixed pipe as and when required.

Any ideas or problems with this?
Pictures would be good.

[47p2]

Any that I've seen have been connected through an extractor type fan
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ROVER
One of Britain's Fine Cars

[colwyn500]

Oooh..please be careful! Only think I can advise (apart from not doing it), is put in a CO alarm, just in case.

[ukdave2002]

All the commercial ones have fans. One other thing to consider is that the vehicle exhaust may not be perfect, in which case not all the fumes will come out of the end of the pipe ....Peter's suggestion to install a CO alarm is a must.

Dave

[lowdrag]

Might this be of help?

[47p2]

Once I tuck my car away for winer hibernation, it never has the engine started until it is ready to emerge the following spiring. If I feel the need to turn the engine over then I insert the starting handle in spin it over a few times.

Short bursts of starting the engine (even when bringing up to temperature in the garage) causes rapid wear and excess damage to the engine internals, far better to leave alone for a few months then once the winter's over take it out for a nice long drive
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ROVER
One of Britain's Fine Cars

[websnail]

I run up my engine 30 minutes at a time moving between 1500 -2000 revs and have used a DIY solution for years.
As an ex gas fitter (amongst other things), I am well aware of CO alarms and have/use two in the garage. Thanks for the warning though.

I plan on having a flexi pipe to fixed pipe to take 99% of the products of combustion and an electric fan based extractor to clear any other fumes as required.

All this is to allow the garage door to remain closed and therefore the temperature and humidity stable.

[Ronniej]

The need for a CO alarm has been stated several times.
I would add, at the risk of stating the obvious, that it would be wise to install one if you use a Calor Gas or similar type of heater.
Never underestimate the risk of carbon monoxide poisoning!
CO alarms are not expensive and are very cheap insurance.
Ronnie J

[47p2]

[peter scott]

[kevin2306]

I start mine up regularly but It wont be taken out in the salty times for obvious reasons, big doors up a foot or more and the side door open about the same ensures a gale blows through even on a still day.

kev

[Fatbloke]

Take a long piece of hose. leave one end outside the garage and put the other end in your mouth. Extra long snorkel to ensure you only breath clean air. Just make sure you don't stand on it!
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Mike,

A Fatbloke in a Herald.

[Old Wrench]

When I installed our rolling road dyno, I made up a long pipe from stock large bore exhaust tubing brazed together, exiting to outdoors; and the exhaust fumes were extracted by use of a sort of clip-on funnel (to accommodate all different exhaust tailpipes), and a fully enclosed extractor fan.

No real spark risk as it was an induction motor.

We had to be very careful, since running up racing cars at full chat for power tuning, meant lots of noise and loads of exhaust fumes in large, but enclosed workshop.

Connecting any exhaust pipe direct to an extension, causes huge amounts of back pressure and disturbs the standing wave pattern the car's exhaust was designed around.

If, for example, one removes the exhaust system and simply substitutes a short stub tube, many saloon car engines will not run properly.

As a matter of interest, the standing wave characteristics, are used by the designer to create a "Free" extraction effect.

Vic Derrington, Harry Weslake and others were aware of this and designed intake and exhaust systems very effectively, from the late 1920s.

The standing wave is created by the fact of exhaust valves opening and closing, as hot "Slugs" of gas accelerate along the pipe and then cool, contract and reverse flow as the exhaust valve closes: similar with standing waves in induction systems.

Thus the exhaust gasses "Pulse" which creates the standing wave.
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Well, apart from that, did you enjoy the play, Mrs Lincoln?

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