78 degrees grey landrover PRT on a 1.8

Yorkshire GOC · 29th June 2020, 08:50

Has anyone used this 78 degrees grey PRT - i normally run the 82 degrees beige PRT - does it confer any advantages?

SD1too · 29th June 2020, 10:16

No Martin and plenty of disadvantages!

It's far too cool. For the UK market an 88 degree thermostat is specified.

Simon

T-Cut · 29th June 2020, 11:45

Quote:

Originally Posted by Yorkshire GOC

Has anyone used this 78 degrees grey PRT

Have you a link to that one? Never seen one myself. The respected SELOC site says it's an 82C type. More interestingly, it's said to have a 'light' pressure relief spring. I've a long standing interest in the PRT so several years ago I bought a grey one from Land Rover. Unfortunately, the spring tension I measured was no different from my original buff version (spec'd as 88C/medium). It wouldn't have served my purpose so I returned it. Over the decades since MGR introduced the PRT, those important specifications have become very muddled. Today, the colour of the plastic casing is no longer significant. You certainly can't rely on it in terms of temperature rating. The important relief pressure scale has also become unintelligible and I suspect, abandoned. Ask a Land Rover dealer what the PRT relief spring rate is and the chances are they won't understand the question. The supplier I used certainly didn't and that was over a decade ago.

Here's what SELOC now say about the PRT: https://wiki.seloc.org/a/Pressure_Re...ote_Thermostat

It certainly reflects my observations and I can understand why you might consider fitting a grey one. Also note the comment about the black version. Frustratingly, I currently have a black one on my 1.8Turbo. I fitted it before I bought the grey one (also as an experiment). The reason I did so was because Xpart/Rimmer had introduced it as the 'latest recommendation' for the 1.8T.

Nowadays, I can't make sense of it because there is no sense in it. However, the SELOC site remains the most authoritative souce of info on the current manifestations of the PRT. Though their interest is towards the sportier side of the K-series engines, you'll not find anything more informative for the 75/ZT application.

TC

Yorkshire GOC · 29th June 2020, 12:40

There you go - on the DMGRS site.

https://www.dmgrs.co.uk/products/k-s...7ee8a41c&_ss=r

T-Cut · 29th June 2020, 13:40

Quote:

Originally Posted by Yorkshire GOC

There you go - on the DMGRS site.
https://www.dmgrs.co.uk/products/k-s...7ee8a41c&_ss=r

Which simply adds to the confusion. If you get a PEL500110 from Rimmer, it has an 82C spec: https://rimmerbros.com/Item--i-PEL500110
I wonder if the 72C is a typing error? MGR have never specified a stat that low and nor does LR, according to the SELOC site.

Basically, I think it's suck it and see. The grey one I tried from Land Rover had the same part number, but the relief spring was definitely the same as my original 88C/medium spring version. My current black one runs 6 to 8 degrees cooler than the buff one. You'll also notice that few Freelander suppliers refer to these as a 'PRT'. They simply describe them as an 'in-line' stat. I'd be very interested to hear how it performs, so do get back here if you decide to fit one.

TC

29th June 2020, 08:50	#1
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,069 Thanks: 1,842 Thanked 623 Times in 469 Posts	78 degrees grey landrover PRT on a 1.8 Has anyone used this 78 degrees grey PRT - i normally run the 82 degrees beige PRT - does it confer any advantages? __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.

29th June 2020, 10:16	#2
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,412 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	No Martin and plenty of disadvantages! It's far too cool. For the UK market an 88 degree thermostat is specified. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

29th June 2020, 12:40	#4
Yorkshire GOC I really should get out more....... Rover 75 connoisseur se v6 auto Join Date: May 2014 Location: Hull Posts: 2,069 Thanks: 1,842 Thanked 623 Times in 469 Posts	There you go - on the DMGRS site. https://www.dmgrs.co.uk/products/k-s...7ee8a41c&_ss=r __________________ She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.