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Air flow below engine
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Whaanga
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Joined: May 07, 2016
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Location: Rochester, NY
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PostPosted: Sun Nov 29, 2020 9:59 am    Post subject: Air flow below engine Reply with quote

Even though I’ve had my bus for 5 years, I’m still learning new things.
Yesterday I was doing some work and had my type 4 engine running. I reached under the bus and unexpectedly felt air flowing under the fan shroud. I began to wonder - is this normal behavior or do I have a leak somewhere? The airflow pattern was in a constant line between the fan shroud the the muffler heat shield so I assume this may be normal behavior - but like I said, I’m still learning new things.

Do I have an air leak?

Thanks,

Jeff
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Late 1973 Bay w/a transplanted 914 Engine


Last edited by Whaanga on Sun Nov 29, 2020 11:54 am; edited 1 time in total
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SGKent Premium Member
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Joined: October 30, 2007
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Location: Citrus Heights CA (Near Sacramento)
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PostPosted: Sun Nov 29, 2020 10:04 am    Post subject: Re: Air flow below engine Reply with quote

on a type IV engine, warm air comes out from the tin sleds after blowing across the cylinders and oil cooler. On a upright with doghouse, part of the air blows out the front of the engine and some out of the sled tin.
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old DKP driver
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Location: Los Gatos,Ca.
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PostPosted: Sun Nov 29, 2020 10:09 am    Post subject: Re: Air flow below engine Reply with quote

Good Morning and I think it’s normal even with all sheet metal in place
But I am now curious and probably will go out and lay on the garage floor
To check this out.
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airschooled
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PostPosted: Sun Nov 29, 2020 2:00 pm    Post subject: Re: Air flow below engine Reply with quote

You can light certain herbs for a visual airflow test, or use the “table-tennis ball in tin foil” trick to create your own smoke tester. The fan shroud has some drain provision, I think, and a little leak there isn’t going to matter much in the grand scheme of things.

I personally employ the heat cast-off to warm my toes when I find myself wearing flip flops in a snowstorm...
Robbie
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Wildthings
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Joined: March 13, 2005
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PostPosted: Sun Nov 29, 2020 3:01 pm    Post subject: Re: Air flow below engine Reply with quote

The hot air exhaust off the heads and cylinders comes out right in front of and below the fan shroud as does the hot air off the oil cooler.
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