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Porsche 356 fan cover plate - what's it for?
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Mr Fish
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PostPosted: Tue Nov 15, 2022 2:34 am    Post subject: Porsche 356 fan cover plate - what's it for? Reply with quote

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
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PostPosted: Tue Nov 15, 2022 5:05 pm    Post subject: Re: Porsche 356 fan cover plate - what's it for? Reply with quote

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
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PostPosted: Wed Nov 16, 2022 2:07 am    Post subject: Re: Porsche 356 fan cover plate - what's it for? Reply with quote

Image may have been reduced in size. Click image to view fullscreen.


hi, its number 56 in the diagram

any ideas?
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alanhall
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PostPosted: Wed Nov 16, 2022 8:08 am    Post subject: Re: Porsche 356 fan cover plate - what's it for? Reply with quote

I believe the plate is for fan noise reduction.
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Starbucket
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PostPosted: Wed Nov 16, 2022 3:45 pm    Post subject: Re: Porsche 356 fan cover plate - what's it for? Reply with quote

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
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PostPosted: Wed Nov 23, 2022 8:02 am    Post subject: Re: Porsche 356 fan cover plate - what's it for? Reply with quote

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
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PostPosted: Tue Nov 29, 2022 4:00 pm    Post subject: Re: Porsche 356 fan cover plate - what's it for? Reply with quote

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.
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wagen19
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PostPosted: Wed Nov 30, 2022 12:36 am    Post subject: Re: Porsche 356 fan cover plate - what's it for? Reply with quote

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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