Classic cars forum & vehicle restoration.
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ajb100
Joined: 30 Jan 2015 Posts: 16 Location: Chippenham, Wiltshire
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Posted: Thu Feb 26, 2015 8:31 pm Post subject: Radiator cap |
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Hi guys, what pressure cap would be needed for an e93a?
Thanks |
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Penguin45
Joined: 28 Jul 2014 Posts: 381 Location: Padiham
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Posted: Thu Feb 26, 2015 9:44 pm Post subject: |
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Pretty sure it's 4 lbs.
P45. _________________ '67 Wolseley MkI 18/85, '70 Austin MkII 1800 The Landcrab Forum. |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22446 Location: UK
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ajb100
Joined: 30 Jan 2015 Posts: 16 Location: Chippenham, Wiltshire
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Posted: Thu Feb 26, 2015 11:04 pm Post subject: |
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From the limited knowledge I have, I don't think it did, but it must have had something to fill it. I know the later cars started with a 4lb cap, but didn't know if that went back that far. |
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alanb
Joined: 10 Sep 2012 Posts: 516 Location: Berkshire.
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Posted: Thu Feb 26, 2015 11:49 pm Post subject: |
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The e93a had a thermo-syphon system so therefore it is not pressurised, later cars such as the 100e that were fitted with a water pump had a pressure cap. _________________ old tourer
Morris 8 two seater |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22446 Location: UK
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ajb100
Joined: 30 Jan 2015 Posts: 16 Location: Chippenham, Wiltshire
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Posted: Fri Feb 27, 2015 8:45 am Post subject: |
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Thanks for the info, so the system is totally open? |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22446 Location: UK
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ajb100
Joined: 30 Jan 2015 Posts: 16 Location: Chippenham, Wiltshire
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Posted: Fri Feb 27, 2015 9:00 am Post subject: |
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It has an electric water pump fitted instead of the crank driven one.
Looks like I'm going to have to re design my head take off to allow for an expansion tank as if been under the impression the system was sealed.
I've found this picture on this forum of a header tank design I'll have to emulate
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ka
Joined: 03 Dec 2007 Posts: 600 Location: Orkney.
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Posted: Fri Feb 27, 2015 9:13 am Post subject: |
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Spot on with the comments already posted. A water pump was available as an option, and also a top hose to take a thermostat, but I would imagine they have long been unavailable.
In standard trim the E93a was thermosyphon, which works quite well in normal temperatures, although there is always the hot spot around the exhaust valve side of the chest. These would not have a pressurised cap, but may have a catch/expansion tank from radiator. The optional, permanently driven water pump gave more efficient cooling around the entire engine, and the dependancy on the exhaust/inlet manifold hot spot even more important, as without a thermostat the engine would not reach operating temperature either as quickly as a stat allows, of even at all.
Using thermosyphon, the engine cooling was dependant a a larger amount of water in the system, therefore larger radiator and attributed weight.The water pump/thermostat system with either electric or engine driven fan allows less water, therefore weight and cost. The engine temperature became especially important with the introduction of heaters in cars, possibly accounting for the 100e running a stat, fan and pump, and a pressurised system, (an increase increase in pressure raises the boiling point of water/fluids by a few degrees).
It is also interesting when the recommended engine temperature is studied. Most thermostats run around 88 to 93 degrees, which would probably indicate the optimum running temperature of the engine, diesels used to run cooler then petrol, but with modern engines and fuels I am not so sure this is the rule now.
For interest my thermosyphon 10hp runs around 90/95 degrees, (I have a combined Smiths temp/oil pressure gauge), and yes I do run a water pump, an electric after market item on a separate switch/relay that I use when going up hills, sat in traffic, or the occasional warm day up here! I did have the optional electrical thermostatically controlled switch fitted, but trusted a manual switch and driver control more. _________________ KA
Better three than four. |
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ajb100
Joined: 30 Jan 2015 Posts: 16 Location: Chippenham, Wiltshire
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alanb
Joined: 10 Sep 2012 Posts: 516 Location: Berkshire.
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Posted: Fri Feb 27, 2015 11:49 am Post subject: |
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It doesn't vent through the cap it vents via the overflow, _________________ old tourer
Morris 8 two seater |
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ajb100
Joined: 30 Jan 2015 Posts: 16 Location: Chippenham, Wiltshire
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Posted: Fri Feb 27, 2015 12:20 pm Post subject: |
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Gotchya, thank you all |
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