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bcrazy
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Joined: October 24, 2009
Posts: 231
Location: Oslo
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 Posted: Wed Jun 16, 2021 9:38 am Post subject: Porsche 356/912 vs T1 cooling, thermostat |
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I am sure this has been debated befor but cannot find it.
Why is it that altleast some 912 engines wich has a pretty simular fan housing/cooling system that the non doghouse t1, does not have a thermostat, but vw has?
My 912 has no thermostat but still seems to warm up fine and oil temp is normally in the 80-100c range |
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evanfrucht
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Joined: July 24, 2016
Posts: 2180
Location: Laurel Canyon, CA
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| Posted: Wed Jun 16, 2021 9:59 am Post subject: Re: Porsche 356/912 vs T1 cooling, thermostat |
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I thought that at least all the 912's had them. Could be wrong tho. Are you sure yours wasn't removed at one point in its life?
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Erik G
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Joined: October 16, 2002
Posts: 13278
Location: Tejas!
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| Posted: Wed Jun 16, 2021 11:08 am Post subject: Re: Porsche 356/912 vs T1 cooling, thermostat |
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| my 66 912 had a thermostat, I believe all 356-912 motors had them |
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bcrazy
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Joined: October 24, 2009
Posts: 231
Location: Oslo
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| Posted: Wed Jun 16, 2021 11:27 am Post subject: Re: Porsche 356/912 vs T1 cooling, thermostat |
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| evanfrucht wrote: |
| I thought that at least all the 912's had them. Could be wrong tho. Are you sure yours wasn't removed at one point in its life? |
Not 100% sure, but i belive the thermostat that was fitted var only for carb preheat system
Page 70
https://www.porsche.com/all/media/pdf/originalparts/en/E_911-1_KATALOG.pdf |
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evanfrucht
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Joined: July 24, 2016
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Location: Laurel Canyon, CA
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| Posted: Wed Jun 16, 2021 12:22 pm Post subject: Re: Porsche 356/912 vs T1 cooling, thermostat |
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Ya I'm not really sure, my father's '67 912 has a thermostat. I also see 356 and 912 thermostat parts for sale. I thought that all, or at least 95%, had them like Erik G but again, not positive.
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1967 Bug ( the daily rod )
1964 Fury Wagon ( the pavement shredder ) |
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bcrazy
Samba Member
Joined: October 24, 2009
Posts: 231
Location: Oslo
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| Posted: Wed Jun 16, 2021 1:50 pm Post subject: Re: Porsche 356/912 vs T1 cooling, thermostat |
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I believe the thermostat is located behind the fan shroud, inside the engine compartment, so to only activate heated air to the carbs.
But I may be wrong... |
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Dan Ruddock
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Joined: October 25, 2012
Posts: 3594
Location: Sarasota, in my adopted state of Florida
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| Posted: Wed Jun 16, 2021 3:20 pm Post subject: Re: Porsche 356/912 vs T1 cooling, thermostat |
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Recycling hot air into the engine compartment will aid some in warming the the engine. Once the engine is warm it stops the hot air to the carbs. My 57a coupe had the system. Dan
Last edited by Dan Ruddock on Wed Jun 16, 2021 3:22 pm; edited 1 time in total |
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Alstrup
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Joined: July 12, 2007
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Location: Videbaek Denmark
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bcrazy
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Joined: October 24, 2009
Posts: 231
Location: Oslo
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| Posted: Thu Jun 17, 2021 12:38 am Post subject: Re: Porsche 356/912 vs T1 cooling, thermostat |
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| Alstrup wrote: |
| 616-xx engines only had carb preheat. The 2 liter has an cooling thermostat. |
The 912E?
Is the control (pressure) to the oil cooler different on 616 engines than t1? |
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Alstrup
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Location: Videbaek Denmark
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oprn
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Joined: November 13, 2016
Posts: 12730
Location: Western Canada
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| Posted: Thu Jun 17, 2021 4:12 am Post subject: Re: Porsche 356/912 vs T1 cooling, thermostat |
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deleted
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Last edited by oprn on Thu Jun 17, 2021 7:04 am; edited 1 time in total |
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Ohio Tom
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Joined: February 09, 2006
Posts: 1660
Location: Marshallville Ohio
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| Posted: Thu Jun 17, 2021 6:16 am Post subject: Re: Porsche 356/912 vs T1 cooling, thermostat |
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| bcrazy wrote: |
| Alstrup wrote: |
| 616-xx engines only had carb preheat. The 2 liter has an cooling thermostat. |
The 912E?
Is the control (pressure) to the oil cooler different on 616 engines than t1? |
912E = T4 motor. Although being 2.0L, it was weaker than the 1600cc 616 motor.
Yes, pressure control is similar on the 616 engine.
The thermostat on 356/912 motors (616) is for pre-heat only. Not all had pre-heat either. Some had nothing.
All depends on what level of trim you purchased. |
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nextgen
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Joined: August 19, 2004
Posts: 6028
Location: CONGERS, N.Y.
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| Posted: Thu Jun 17, 2021 7:24 am Post subject: Re: Porsche 356/912 vs T1 cooling, thermostat |
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You would expect engineers to make the correct decisions when comes to control of engine.
I can understand the variables. My T-4 upright fan conversion is the only conversion that I know of that uses a thermostat.
Power to Weight had a lot to do with the selection of the temp, of the thermostat.
In cool weather my bug ran like it had carb problems. I was using a stock T-1 80c Thermostat the came on too fast. The bug was not reaching running temp??
Then I checked and noticed in my parts collection that a T-4 used a 90c.
The gave the engine enough time to warm up.
Good example of what the engineers must have went through.
The T-4 was hardly working to push the light bug, which it was not designed.
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