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Mr Fish Samba Member
Joined: February 16, 2007 Posts: 23 Location: Gloucestershire, UK
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Posted: Tue Nov 15, 2022 2:34 am Post subject: Porsche 356 fan cover plate - what's it for? |
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Hello
Can anyone tell me what the purpose of the Porsche 356 fan cover plate/disc is ? - it's the smaller one that sits just behind the fan itself? I know that the same era VW engine do not have this disc which has got me thinking as to what it does? |
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Starbucket Samba Member
Joined: April 30, 2007 Posts: 4025 Location: WA
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Posted: Tue Nov 15, 2022 5:05 pm Post subject: Re: Porsche 356 fan cover plate - what's it for? |
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Can you post a picture I know some early 356's mounted a oil cooler loop in front of the fan intake. |
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Mr Fish Samba Member
Joined: February 16, 2007 Posts: 23 Location: Gloucestershire, UK
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Posted: Wed Nov 16, 2022 2:07 am Post subject: Re: Porsche 356 fan cover plate - what's it for? |
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hi, its number 56 in the diagram
any ideas? |
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alanhall Samba Member
Joined: February 18, 2006 Posts: 115 Location: Northern California
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Posted: Wed Nov 16, 2022 8:08 am Post subject: Re: Porsche 356 fan cover plate - what's it for? |
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I believe the plate is for fan noise reduction. |
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Starbucket Samba Member
Joined: April 30, 2007 Posts: 4025 Location: WA
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Posted: Wed Nov 16, 2022 3:45 pm Post subject: Re: Porsche 356 fan cover plate - what's it for? |
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I've got a gen./fan. assy on the shelf but there is a lot of stuff in front of it right now but my guess is it blocks the air that is drawn in from escaping through the lighting holes in the fan assy. |
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James Davies Samba Member
Joined: September 24, 2013 Posts: 141 Location: Baltimore, USA
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Posted: Wed Nov 23, 2022 8:02 am Post subject: Re: Porsche 356 fan cover plate - what's it for? |
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As Starbucket indicates, the purpose of the plate is to cover the holes in the fan assembly and provide better cooling.
This plate was introduced in Jan 1954 along with the new 160 watt generator and 160 watt under-the-dash regulator, an upgrade over the 130 watt gen/regulator that was shared with VW up until that point. The new generator and regulator combo produced more heat and needed better cooling. And this was the solution. There's a Porsche Service Bulletin that describes this (5/54). |
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Bub Samba Member
Joined: June 10, 2004 Posts: 1155 Location: Central Washington
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Posted: Tue Nov 29, 2022 4:00 pm Post subject: Re: Porsche 356 fan cover plate - what's it for? |
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James Davies wrote: |
As Starbucket indicates, the purpose of the plate is to cover the holes in the fan assembly and provide better cooling.
This plate was introduced in Jan 1954 along with the new 160 watt generator and 160 watt under-the-dash regulator, an upgrade over the 130 watt gen/regulator that was shared with VW up until that point. The new generator and regulator combo produced more heat and needed better cooling. And this was the solution. There's a Porsche Service Bulletin that describes this (5/54). |
Does anyone have any data to show that covering the holes vs leaving open has ANY measurable effect on cooling?
Back in the olden times at a 'round table' discussion I attended w/ Mr Pellow he said the holes made no difference except for the noise. The VW had them to create fan noise to deter people from revving the 36hp too much. Not so much an issue in the 356, being better built AND having a tacho right off the lot.
Curious because there are early 14 and 28 blade fans that both have the holes and some that don't. _________________
hitest wrote: |
Had a girlfriend once who shall we say, nearly arrived at the mere sight of a semaphore in action- easy to please she was... |
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wagen19 Samba Member
Joined: November 16, 2007 Posts: 23 Location: germany
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Posted: Wed Nov 30, 2022 12:36 am Post subject: Re: Porsche 356 fan cover plate - what's it for? |
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Bub wrote: |
James Davies wrote: |
As Starbucket indicates, the purpose of the plate is to cover the holes in the fan assembly and provide better cooling.
This plate was introduced in Jan 1954 along with the new 160 watt generator and 160 watt under-the-dash regulator, an upgrade over the 130 watt gen/regulator that was shared with VW up until that point. The new generator and regulator combo produced more heat and needed better cooling. And this was the solution. There's a Porsche Service Bulletin that describes this (5/54). |
Does anyone have any data to show that covering the holes vs leaving open has ANY measurable effect on cooling?
Back in the olden times at a 'round table' discussion I attended w/ Mr Pellow he said the holes made no difference except for the noise. The VW had them to create fan noise to deter people from revving the 36hp too much. Not so much an issue in the 356, being better built AND having a tacho right off the lot.
Curious because there are early 14 and 28 blade fans that both have the holes and some that don't. |
Comparing VW:
from 1949 on, there were 4 types of fans:
a) 16 blades with holes for Limas 90 mm diameter
b) 28 blades with holes for Limas 90 mm diameter
c) 28 blades without holes for Limas 105 mm diameter
d) 28 blades wide, without holes, for dual port engines, 105 mm Limas only
https://www.volkswagen-classic-parts.com/catalogues/Kaefer-1971/html5.html#/120
Beside: there is a difference in Lima housing 160 W, VW and Porsche |
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