620 Cooling - Radiator Bypass Loop

114 posts / 0 new
Last post
Mark w
Online
Last seen: 2 min 56 sec ago
Joined: 17/04/2014
Titanium7
Titanium7's picture
Online
Last seen: 2 min 10 sec ago
Joined: 17/04/2014

Same 82C stat at a better price.  Rimmer Brothers 

Driving 'The Fat One' Driving

CtrMint
CtrMint's picture
Online
Last seen: 6 min 23 sec ago
Joined: 13/06/2018

Starting to see the point...the differing temps in the stats may cause the fan to run against the rad when the rad isn't getting flow etc.  I'm learning here!  I'm not too concerned about the pressure, at the end of the day I'm not changing that behaviour.

If I'm going to try this, I will need an 82 stat.  I need to find that Rover stat on its own.

Love this from the link you sent  

Designed to help to prevent thermal shock suffered by the engine and reduce head gasket failure by keeping the engine temperature change at a slow and even rate.

Should send that to CC.

Caterham 420R S3 Lotus Toxic Green,  awaiting Caterham 620R delivery. Blog: https://www.caterham7diaries.com
Mark w
Online
Last seen: 2 min 56 sec ago
Joined: 17/04/2014

Thumb Up

Mark w
Online
Last seen: 2 min 56 sec ago
Joined: 17/04/2014

Same 82C stat at a better price.  Rimmer Brothers

i can't see where it states this is 82 degrees , the standard Rover ones are normally 87 or 88 

CtrMint
CtrMint's picture
Online
Last seen: 6 min 23 sec ago
Joined: 13/06/2018

Just been out and had a look at the temp gauge, from memory I think the fan kicks in at 90c.  If you could confirm that would be amazing. thanks

Caterham 420R S3 Lotus Toxic Green,  awaiting Caterham 620R delivery. Blog: https://www.caterham7diaries.com
CtrMint
CtrMint's picture
Online
Last seen: 6 min 23 sec ago
Joined: 13/06/2018

Wow thanks guys, those links have lots of options.  

I notice Rimmer Brothers have a couple of OEM 82 stats at different prices.

https://rimmerbros.com/Item--i-GRID018846

Anyone more recommended over another?

Caterham 420R S3 Lotus Toxic Green,  awaiting Caterham 620R delivery. Blog: https://www.caterham7diaries.com
CtrMint
CtrMint's picture
Online
Last seen: 6 min 23 sec ago
Joined: 13/06/2018

I've been looking at how the PRT works, I've pinched someone's diagram and modified it to represent how I believe it would be connected.   Now my concern here is that the shape of the PRT will result in the full force of the coolant flow hitting the back of the stat causing it to stay open just like the factory stat.  It won't be able to close the bypass.

I know the housing I picked is only subtly different, but I was hopeful it would alleviate the pressure issue.

I'm starting to think this isn't going to work, it's going to need your modification, or remove the factory stat?

 

Caterham 420R S3 Lotus Toxic Green,  awaiting Caterham 620R delivery. Blog: https://www.caterham7diaries.com
Mark w
Online
Last seen: 2 min 56 sec ago
Joined: 17/04/2014

Mark 

Whilst you are thinking about thermostats think about the standard Duratec one , its double ended , when it heats up it  opens to let cold water flow from the rad whilst at the same time it closes the bypass loop . 

Not trying to be obtuse here just want you to think and understand how the system on your 420 works . 

CtrMint
CtrMint's picture
Online
Last seen: 6 min 23 sec ago
Joined: 13/06/2018

doing my best here.... 

Having posted what I mentioned in #19 about pressure pinning the stat closed, I'm wondering if the fact there's 32mm exits either way there won't be the force on the plate, so it can move, unlike the OEM housing with only the 16mm bypass hose.

Does the force/pressure only occur at the factory housing, and drop beyond the expansion bottle, 

I'm getting confused  Nuts

Caterham 420R S3 Lotus Toxic Green,  awaiting Caterham 620R delivery. Blog: https://www.caterham7diaries.com