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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8088

 2011 Defender 110 Puma 2.4 USW Stornoway Grey
I'd still block the bypass waterway. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1056172 3rd Jan 2025 7:27am
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Doby92



Member Since: 01 Jan 2025
Location: Mackay
Posts: 4

Australia 1992 Defender 110 BMW M57 3.0 Diesel PU Auto Alpine White
what is the bypass waterway, the Thermostat only has a simple spring loaded valve, either open or closed, no other valve in it.
Post #1056183 3rd Jan 2025 8:53am
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Les Brock



Member Since: 20 Mar 2012
Location: Stroud, Glos
Posts: 153

United Kingdom 
James,

Hows the stat modified or just a lower temp stat (part number) ?

I thought I read the Davies EWP pumps could be run pass through in the bottom hose (with 2x3mm holes drilled in stat to stop it dead heading) with belt pump left in situ

not heard/thought of fitting pump in top hose before TBH - but if it works .....

I have a EWP150 sat here trying to decide where it should go ...

Cheers
Post #1056187 3rd Jan 2025 10:21am
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andy63



Member Since: 30 Jun 2023
Location: north east
Posts: 553

United Kingdom 
Doby92 wrote:
what is the bypass waterway, the Thermostat only has a simple spring loaded valve, either open or closed, no other valve in it.


All stats work on that principle ..
When cold the water is just looped back to the pump from the engine..
When the water is hot enough the stat starts to open and allow some flow to the radiator from engine before returning to the pump..if it keeps getting hotter the stat will fully open and close the normal flow from the engine to pump off and all the coolant will pass through the radiator before returning to the pump..
That's what is been referred to by bypass I think..if you simply remove the stat the water from the engine has two paths available. Directly back to pump and back to pump via radiator..

In a properly functioning and designed system once the stat is fully opened and all coolant is diverted through the radiator that should maintain the engine temp within a few degrees of the max stat rating..they usually have a opening temp and a fully open temp..
So really by removing a stat all you should really be doing is causing the engine to take longer to reach its max temp if its been worked hard and causing it to run cool when not been worked.. or that's how I see it..🤔
Post #1056190 3rd Jan 2025 10:57am
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8088

 2011 Defender 110 Puma 2.4 USW Stornoway Grey
Yep, correct. So block route from head to pump that bypasses the rad to make sure it all goes through the rad. As andy not needed on a properly balanced system, which the m57 in a def isint and the stats are of questionable quality.

Ewp top hose switched to come on when there is flow in top.

Modified mahle stat in my cases. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1056219 3rd Jan 2025 3:25pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8088

 2011 Defender 110 Puma 2.4 USW Stornoway Grey
Yep, correct. So block route from head to pump that bypasses the rad to make sure it all goes through the rad. As andy not needed on a properly balanced system, which the m57 in a def isint and the stats are of questionable quality.

Ewp top hose switched to come on when there is flow in top.

Modified mahle stat in my cases. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1056220 3rd Jan 2025 3:26pm
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tommobot



Member Since: 15 May 2018
Location: Stratford Upon Avon
Posts: 27

United Kingdom 
Sorry for the endless questions but would you be able to provide a photo of the EWP in top hose... I'm struggling to visualize how I'd fit one in the top hose as the Craig Davies pumps seem fairly adamant in their installation orientation...
Post #1056252 3rd Jan 2025 9:02pm
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tommobot



Member Since: 15 May 2018
Location: Stratford Upon Avon
Posts: 27

United Kingdom 
Sorry for the endless questions but would you be able to provide a photo of the EWP in top hose... I'm struggling to visualize how I'd fit one in the top hose as the Craig Davies pumps seem fairly adamant in their installation orientation...
Post #1056253 3rd Jan 2025 9:02pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8088

 2011 Defender 110 Puma 2.4 USW Stornoway Grey
tommobot wrote:
Sorry for the endless questions but would you be able to provide a photo of the EWP in top hose... I'm struggling to visualize how I'd fit one in the top hose as the Craig Davies pumps seem fairly adamant in their installation orientation...


Just fit so outlet at top for air to exit. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1056261 3rd Jan 2025 9:43pm
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