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Thanks Pedro/Diesel,Quote:
Originally Posted by Pedro_The_Swift
I may get one sent over to from Rimmer Bros. However, the PEL500110 seems made for the 1.8 Freelander (K series to run cooler) or the TD5.
If fitted to the V8 will it just lower the running temp?...
Rob
This from over there
"PEM100990 - Cream is 88° With hard Spring (Designed for Diesel and V8 applications)
PEM101020 - Black or Cream is 82° With Hard Spring (Designed for a V8 and used as a stopgap with K4 engines)
PEL500110 - Grey is 82° With Light Spring (K4 engines)
The spring referred to is the pressure relief setting. the car K4 engine has a lighter spring because the volume flow is much smaller than the V8 or diesel engines.
the 88C is 192F and the 82C is 180F the listed temperature at full opening."
the second is interesting--
Thanks for this, appears it's made for the 1.8 K Series (helped with the Head Gasket issues I have read!) and the TD5 engine.Quote:
Originally Posted by diesel
Can this be used on the 4.0l V8?
found this on an MG Rover forum,,,
As I mentioned in my first post, the difference between any of these in real world terms is negligible and the only thing you may notice is a slight change to heater performance.
When the engine is being pushed and cooling becomes an issue, they will all be operating above their set temperatures and be wide open. The pressure spring side of things just makes a slight change to the engine speed at which the stat will open regardless of temperature.
Dr Rik
any techy people care to comment?
I believe this statement that you quote from the MG forum is just a little incorrect. The thermostat bypass and the spring weight has to do with how the system behaves when cold. The D2 (and I guess other land rover cooling systems) will bypass the radiator when cold and most of the coolant flows through the heater core/matrix instead. This allows the engine and passenger compartment to come up to temperature more quickly. The bypass spring allow for coolant to flow through the radiator instead when revs increase or for other reasons that would cause the coolant pressure to increase. With the softer spring, it's more likely to bypass the heater-core-only circuit, and pump coolant through the radiator too. The only downfall of this is it might take a little longer for the heater to feel hot on a cold day.Quote:
Originally Posted by Pedro_The_Swift
When the engine is up to full operating temperature, the main portion of the thermostat is open, and the bypass and the spring are completely out of the equation.
Thanks jafir,,
I asked for a price of a
PEM101020
from a MG Rover spares shop(in OZ) and was quoted $90--:Thump:
Spoke with my Father in the UK today to get a price and also to Ayres Auto Sydney Land Rover.
Both people I trust said leave the standard one in the car!.
Below is the note from the LR guy in Sydney. Which is also what my father said.
=======================
Rob
It is important that the correct temperature thermostat is always fitted in your car, not a cooler one!
With a cooler thermostat the engine management system thinks the engine hasn’t reached normal operating temperature yet and will inject more fuel.
The engine is designed to run at a specific temperature and that is usually as hot as possible without overheating. This is where Rover V8 engines are the most efficient.
What determines whether the car will overheat or not in hot weather is the size and cleanliness of the radiator (internally & externally) and proper functioning of the viscous coupling in the fan. The coolant is directed through the radiator as needed by the thermostat to maintain exact engine temperature, probably about 95 degrees in your case.
To fit a cooler thermostat will promote poor economy and increased engine wear.
===============
I was also told that the 95c Thermostats are designed to get the engine up to temp quite quick and keep the temp stable.
Cooler Thermostats will give heavy fluctuation in when driving and The head gaskets dont like this much!.
I think I will stick to taking care of he cooling system as LR designed it.
The only colder thermostats available still allow the engine to run in closed loop. Running at the factory specified temp will probably allow the system to run a little bit leaner and reduce emissions, but I'll bet you'd have a hard time seeing the difference when it comes time to pay for fuel.Quote:
Originally Posted by Robgw
Now if you were to do the thermostat mod listed here: Inline Thermostat - LAND ROVER CLUB V.I. then you could pick whatever thermostat you wanted, and if you pick something too cool, you'd run the risk of never getting to closed loop operation, and the engine would run way too rich.
There is a no reason a slightly cooler thermostat would cause fluctuations. And having the temps lower would probably be BETTER for the head gaskets.Quote:
Originally Posted by Robgw
A can of worms here indeed!
Seems lots of evidence either way.
I think i will be sticking to what I have and keeping the cooling system well maintained, after all the car has not had an issue in 11 years.
A system flush once a year won't hurt.
Rob
Thought I would report back with my new stat findings. :)
Temps with the original stat were around 96/97 under average driving conditions, this rose quickly to 102 when driving slow or stationery (as you often are on the coast with all the traffic lights).
If I pulled away quickly they would drop suddenly to 91/92. Then move back to the 97 until I stopped again, then up to 102...
This fluctuation cannot be good for the alloy engine. I have temps go up to 109 if I'm in heavy stop, start traffic.
So, as I posted earlier I did a little research (the link to one thread posted on the 1st page). I can say that I agree with what people have found.
The warm-up time is the same, no slower.
The temperature now is steady at 87.
It moves between 87 and 88 in stop-start traffic. The highest I have had is 91, this was this weekend, while climbing a very steep ascent on rocky terrain in high box when I should really have used low.
With the new stat I have done motorway, normal roads, stop/start traffic and off road, as I said, it holds steady at 87. Plus when I open my bonnet I don't get my hair and eyebrows singed with the sudden wave of heat!!
Further info: When I had my original stat out I compared the springs, interesting as I found no difference–very hard to move... :o
M
P.S. Before anyone asks:
Yes it reaches closed loop, same as before. No fault codes. :cool: