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Pelikan
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Joined: September 20, 2008
Posts: 61
Location: Los Angeles
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 Posted: Mon Oct 20, 2014 3:47 pm Post subject: Fan Shroud Clearance Question |
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I'm mounting something small to the fan shroud. I'm wondering how close the fan gets to the side of the shroud. I just want to be sure the screws won't be long enough to interfere with the fan.
EDIT: Is this a pretty good cross-section for the average doghouse? If that's the case it looks like I'd be pretty good mounting on the left side of the housing.
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Aussiebug
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Joined: June 03, 2002
Posts: 2162
Location: Adelaide Australia
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| Posted: Mon Oct 20, 2014 3:52 pm Post subject: |
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The fan comes out with the backing plate with the 4 screws, which is just in front (front is front of car) of the alt/gen, so as long as you are outside the diameter of the backing plate, you wont touch the fan disc.
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Rob
Rob and Dave's aircooled VW pages
Repairs and maintenance for the home mechanic
http://www.vw-resource.com |
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Joel
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Joined: September 04, 2006
Posts: 11099
Location: NSW Australia
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| Posted: Mon Oct 20, 2014 4:12 pm Post subject: |
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And if you look close you should be able to see the spot welds for all the deflectors which you need to try and miss to.
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Quick little bug, you got a Porsche motor in that?
1974 Germanlook 1303 2.5 Suba-Beetle |
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EVfun
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Joined: April 01, 2012
Posts: 5481
Location: Seattle
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| Posted: Mon Oct 20, 2014 5:38 pm Post subject: Re: Fan Shroud Clearance Question |
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| Pelikan wrote: |
Is this a pretty good cross-section for the average doghouse? If that's the case it looks like I'd be pretty good mounting on the left side of the housing.
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That is an excellent picture showing the internal details of a factory fan shroud. There is a lot of work in getting air to the left side. The heater outlet air supply is interesting too, especially considering that the stock system never completely turns off the air to the heater boxes.
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| Wildthings wrote: |
| As a general rule, cheap parts are the most expensive parts you can buy. |
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Aussiebug
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Joined: June 03, 2002
Posts: 2162
Location: Adelaide Australia
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| Posted: Tue Oct 21, 2014 12:17 am Post subject: |
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It IS an excellent picture of the internal structure of the doghouse shroud.
VW spent about $million US in 69-70 redesigning the cooling system for the doghouse engines. All those guide vanes were there for a purpose and it shows how much extra work is needed than just a simple "can" around the fan like some of the 36hp aftermarket shrouds use.
Another interesting point is the air for the oil cooler - it comes from that slot on the right side - only about 1/3 of the fan diameter, and travels through a duct under the fan opening (not seen in this pic) across to the left side where the oil cooler sits. It comes from the RIGHT side where the airflow is obviously better, so the left side cylinders get a little more air off the fan, indicating that VW were still concerned about enough cooling for the left cylinders, even with the oil cooler moved to the doghouse.
And as EVfun says, the separate air paths for the heater outlets is interesting too - the air for the heaters is not just taken from the air spilling around in the shroud, but it's DIRECTED through two outside ducts, and that's the secret of the whole cooling system for VWs - it's all directed and controlled airflow, not just "push it around until it finds it's way out".
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Rob
Rob and Dave's aircooled VW pages
Repairs and maintenance for the home mechanic
http://www.vw-resource.com |
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