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Ideas for indoor engine running
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websnail



Joined: 26 Oct 2010
Posts: 78
Location: West Sussex

PostPosted: Sat Nov 08, 2014 11:43 pm    Post subject: Ideas for indoor engine running Reply with quote

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. Smile
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47p2



Joined: 24 Nov 2007
Posts: 2009
Location: Glasgow

PostPosted: Sun Nov 09, 2014 1:07 am    Post subject: Reply with quote

Any that I've seen have been connected through an extractor type fan
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colwyn500



Joined: 21 Oct 2012
Posts: 1745
Location: Nairn, Scotland

PostPosted: Sun Nov 09, 2014 8:49 am    Post subject: Reply with quote

Oooh..please be careful! Only think I can advise (apart from not doing it), is put in a CO alarm, just in case.
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ukdave2002



Joined: 23 Nov 2007
Posts: 4236
Location: South Cheshire

PostPosted: Sun Nov 09, 2014 10:03 am    Post subject: Reply with quote

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 Shocked ....Peter's suggestion to install a CO alarm is a must.

Dave
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lowdrag



Joined: 10 Apr 2009
Posts: 1600
Location: Le Mans

PostPosted: Sun Nov 09, 2014 10:19 am    Post subject: Reply with quote

Might this be of help?

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47p2



Joined: 24 Nov 2007
Posts: 2009
Location: Glasgow

PostPosted: Sun Nov 09, 2014 10:25 am    Post subject: Reply with quote

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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websnail



Joined: 26 Oct 2010
Posts: 78
Location: West Sussex

PostPosted: Sun Nov 09, 2014 6:36 pm    Post subject: Reply with quote

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. Smile
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Ronniej



Joined: 02 Dec 2008
Posts: 239
Location: Blackwood, by Lanark, Scotland

PostPosted: Tue Nov 11, 2014 11:33 am    Post subject: ideas for indoor engine running Reply with quote

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
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47p2



Joined: 24 Nov 2007
Posts: 2009
Location: Glasgow

PostPosted: Tue Nov 11, 2014 1:46 pm    Post subject: Reply with quote

websnail wrote:
...an electric fan based extractor to clear any other fumes as required.



You would also need to watch that any unburned fuel going through the pipework from the exhaust didn't get ignighted by the 'electric' fan motor Shocked
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peter scott



Joined: 18 Dec 2007
Posts: 7214
Location: Edinburgh

PostPosted: Tue Nov 11, 2014 4:41 pm    Post subject: Reply with quote

47p2 wrote:

Short bursts of starting the engine (even when bringing up to temperature in the garage) causes rapid wear


It is true that most engine wear takes place during first start and warm-up. Despite that I start mine about once a month and cover the radiator until it reaches more than normal running temperature. I recon six more cold starts each year will not greatly add to the wear process. Certainly not in my lifetime.

Whilst doing this I engage first gear and slip the clutch just to ensure that it doesn't weld itself to the flywheel (which is has done in the past despite being in a ventilated garage with dpc and underfloor membrane).

I park the car with its rear end at the garage doors and run it with them wide open so no CO hazard.

Peter
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kevin2306



Joined: 01 Jul 2013
Posts: 1359
Location: nr Llangollen, north wales

PostPosted: Tue Nov 11, 2014 4:48 pm    Post subject: Reply with quote

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
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Fatbloke



Joined: 26 Jun 2014
Posts: 86
Location: Royal Wootton Bassett

PostPosted: Tue Nov 11, 2014 5:53 pm    Post subject: Reply with quote

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. Very Happy Just make sure you don't stand on it! Embarassed
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Old Wrench



Joined: 23 Dec 2013
Posts: 226
Location: Essex and France

PostPosted: Tue Nov 11, 2014 6:07 pm    Post subject: Reply with quote

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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websnail



Joined: 26 Oct 2010
Posts: 78
Location: West Sussex

PostPosted: Tue Nov 11, 2014 7:43 pm    Post subject: Re: ideas for indoor engine running Reply with quote

Ronniej wrote:
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

Also by me! Smile I only use electric oil filled rads, so no fume risk there.

Fat bloke, love it Smile Smile

47p2, re: unburnt fuel. My plan was a fan pulling fresh air in, creating a positive pressure in the garage.

Old Wrench, good point (I was aware of this) but I'm not trying to tune an engine and on my Landrover, probably not make too much of a difference.

peter scott, I operate both the brake and clutch pedals every other week about 5 presses each. When I do fire it up, I do slip the clutch for a second or two .
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