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Originally Posted by LeaUK
I have thought about this statement and still conclude that silicone viscosity may effect cut in temperature - how do YOU explain that my vfc cuts in at 80-85C then?
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A ton of posts in this thread, and you still think that the 'gel' in your VFC may effect the cutin temperature. Hint: it doesn't!
Maybe you are pulling my leg. . got to be that???
Have you forgotten that yesterday you found that your bms is "different" than mine; remember "1577" and "1577A"? It has different material, etc. That's why it operates at 85C.
So carrying you argument a little further, if you test your bms ALONE in water, it won't bend at 85C because the it NEEDS the gel in vfc chambers to help it bend??? You think that sounds crazy but that's what you have just said.
The BMS HAS TO BEND enough to allow the gel to 'migrate' but, IF IT DOESN'T BEND, the VFC will NEVER lock not matter what you have in the chamber. And it has to bend a goodly amount for the vfc to start to function.
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Originally Posted by LeaUK
My assumption is based on that the fact that the bms will bend but not much, it's transfer characteristic is linear - not bent or net bent as I know you understand. Therefore if my silicone is far to viscous less will be required in chamber 2 to achieve lock, thus locking at possibly an earlier temperature.
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You said the ". . the bms will bend but not much". It will bend linearly with increasing temperature but the "NOT MUCH" has to be at least 0.060" (or so) to start to act as a vfc.
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Originally Posted by LeaUK
I'm now also concerned about what I'm going to receive from the dealer....one of the reasons I started to discuss here. But assuming that I still have my bms I can resolve both the leak AND the potential of HOT coolant by simply swapping.
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Now you've said that your bms
IS different than my BMS since you said ". .I still have my bms (and) can resolve both the leak and . . hot coolant . . by simply swapping". But you couldn't do that if your bms was the same as mine. And what happened to the 'gel' argument? You said that "viscosity of the gel may effect lock temperature". So what is the viscosity of the gel in the new VFC??? I'm sure you see that you are going around in circles!
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Originally Posted by LeaUK
But, if those 'copper' '00's you tested are not of different algaman to mine (and your pictures do look greater in 'orange' but bear in mind mine is 12 years old), this means that both Sachs and MB appear to have no control over supply of two completely different parts. And they know this should be tightly controlled as they have admitted to a problem (only documented in the E500).
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Again you must be pulling my leg??? Maybe you mean "copper" in color??? But it's not copper, but brass. Brass is brass; it doesn't FADE with time. It still has its characteristic color and can be 100 years old and will still look as it does today.
The reason
your bms is a different color is that it IS made of different material otherwise it wouldn't lock at 85C! We are going around in circles.
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Originally Posted by LeaUK
My questions for you:
1. How do you explain why MB hasn't rolled out the 01 part if it's a known issue on the R129 and W140 - assuming the 01 part has been modified to reduce coolant temperature.
2. Why didn't MB place the 01 part in all R129 119 engines post 974/975 engines?
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I can't answer those questions! That's what I posted in #145 since I tested what was supposed to be a 82C bms "01". That was also tested on the car with no lock-up. I think that these VFCs are OUT-OF-CONTROL but why that is, I don't know.