Recs for UPGRADED Cylinder Head stud kit
Senior Member
Joined: Feb 2015
Posts: 775
Likes: 262
From: Central Florida
Incidentally, when I did replace the head gaskets on my Range Rover AJ133, I used the original size for my VIN which are the 10mm head bolts (Genuine JLR direct from a dealership).
I was concerned that the size of the bolt might have been related to the head gaskets failure in the first place, but they went in fine and are working fine so far.
With my natural mindset of "bigger is better" for fastener strength I was hoping that my VIN used the 11mm, but it doesn't.
I was concerned that the size of the bolt might have been related to the head gaskets failure in the first place, but they went in fine and are working fine so far.
With my natural mindset of "bigger is better" for fastener strength I was hoping that my VIN used the 11mm, but it doesn't.
Senior Member
Joined: Jul 2019
Posts: 467
Likes: 187
From: WI
Jag12Mark,
As a graduate of the UK ETPS we were mainly schooled in exploring the edges of the flying envelope, and ensuring that the systems on board were adequate for the job. We also ensured that any external stores left the aircraft in a safe condition (safe for the release aircraft).
[As part of the course I flew the F-14, F-15, F-16, F-18 and AV8B..oh, and the T-38 and Gripen]
Most, but not all, of the avionics development was left to graduates of the 'aero systems' course. What ever they worked out still had to be cleared by a TP before release to the front line.
Having left the UK military, I became a civil TP in the US. Once a TP, always a TP.
Lotus, I can't predict when, or if, a failure will occur by using Evans coolant. No body has tested it, except you, on JLR engines. A data base of one is not a strong position to work from.
The coolant system on these engine needs some pressure to circulate coolant around the engine.
wombat
As a graduate of the UK ETPS we were mainly schooled in exploring the edges of the flying envelope, and ensuring that the systems on board were adequate for the job. We also ensured that any external stores left the aircraft in a safe condition (safe for the release aircraft).
[As part of the course I flew the F-14, F-15, F-16, F-18 and AV8B..oh, and the T-38 and Gripen]
Most, but not all, of the avionics development was left to graduates of the 'aero systems' course. What ever they worked out still had to be cleared by a TP before release to the front line.
Having left the UK military, I became a civil TP in the US. Once a TP, always a TP.
Lotus, I can't predict when, or if, a failure will occur by using Evans coolant. No body has tested it, except you, on JLR engines. A data base of one is not a strong position to work from.
The coolant system on these engine needs some pressure to circulate coolant around the engine.
wombat
Last edited by wombat; Jul 3, 2025 at 11:53 PM.
Veteran Member
Joined: May 2009
Posts: 12,052
Likes: 3,344
From: home
Water wetter and others of the same type are surfactants and indeed do work. That's why Evans in their TrackWater lists it as "Surface Tension Reduction" additive.
This is what a surfactant does it breaks the surface tension of water so it can flow easier and does not bead up.
Now whether you will see any benefits is up in the air as there are so many factors involved. Note that adding surfactants to an anti-freeze mixture is NOT as effective as adding it to straight water as Evans does. I have used it before with no downsides but then I noticed no improvements either. So I stopped using it as the regular mixture of Glycol and water seems to work fine.
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This is what a surfactant does it breaks the surface tension of water so it can flow easier and does not bead up.
Now whether you will see any benefits is up in the air as there are so many factors involved. Note that adding surfactants to an anti-freeze mixture is NOT as effective as adding it to straight water as Evans does. I have used it before with no downsides but then I noticed no improvements either. So I stopped using it as the regular mixture of Glycol and water seems to work fine.
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