Radiator temperatures - BMW Luxury Touring Community
 
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post #1 of 7 Old Jan 8th, 2006, 12:24 pm Thread Starter
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Radiator temperatures

First: they're not "radiators", they're "convectors". They transfer excess heat out of the engine by means of convection - they don't run nearly hot enough to transfer much heat via radiation.

Whatever. Anyone have access to one of those non-contact temperature measuring devices? If so, point it at the "radiators" after they're fully up to temperature. I did that @ Touring Sport BMW - borrowed their temp-measuring tool - and got two very different readings. Is it normal for the two "radiators" on the LT to run at two very different temperatures?

I don't recall what two temperatures I read - 'cause at that point, bending down and over to 'shoot' the radiator temperatures under the nose of the bike, I lost my balance and fell on my ass. As I was falling, I reached out to stop my fall and grabbed the mirror on the LT. I wound up on my ass, and the mirror wound up at the end of its tether. Why the hell do we need to tether the mirrors on a $20,000 motorcycle, anyway?

At any rate, in the midst of my embarrassment I forgot the temperature readings, except to have noted that the two radiators were quite different in temp. Is this normal?

- Bob

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post #2 of 7 Old Jan 8th, 2006, 12:34 pm
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Quote:
Originally Posted by bob_menton
First: they're not "radiators", they're "convectors". They transfer excess heat out of the engine by means of convection - they don't run nearly hot enough to transfer much heat via radiation.

Whatever. Anyone have access to one of those non-contact temperature measuring devices? If so, point it at the "radiators" after they're fully up to temperature. I did that @ Touring Sport BMW - borrowed their temp-measuring tool - and got two very different readings. Is it normal for the two "radiators" on the LT to run at two very different temperatures?

I don't recall what two temperatures I read - 'cause at that point, bending down and over to 'shoot' the radiator temperatures under the nose of the bike, I lost my balance and fell on my ass. As I was falling, I reached out to stop my fall and grabbed the mirror on the LT. I wound up on my ass, and the mirror wound up at the end of its tether. Why the hell do we need to tether the mirrors on a $20,000 motorcycle, anyway?

At any rate, in the midst of my embarrassment I forgot the temperature readings, except to have noted that the two radiators were quite different in temp. Is this normal?

- Bob
I would say normal. The side accepting fluid from the engine block should have a higher temp. By the time the fluid travels to opposite side , perhaps the feed side it will be cooler . I will look at the manual to determin flow.

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post #3 of 7 Old Jan 8th, 2006, 12:56 pm
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That's what I'm thinking.. If the radiators are in "series" then one should be cooler than the other.. if in Parallel then cooler at the top than the bottom..

You've got me curious now....Yes they are in series according to the coolant circuit illustration.. So one should be cooler than the other.

John

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post #4 of 7 Old Jan 8th, 2006, 12:57 pm
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Talking Radiator temps

When I was first testing the "Bug-Guards" for Beemers that I sell for the LT, I bought an infa-red pistol type temperature gun. I did a NASCAR style test by running at highway speed, pulling off to the shoulder and measuring the radiators. Now, it's been about two years, but I remember that they both were within a couple of degrees of 147 degrees (F). This was when the bike guage was at the 1/2 mark.

I still have the temp gun, so if you want me to test the radiators in some other fashion, (except while riding!, LOL) let me know and I'll be glad to do that.

Gene Sweeney

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post #5 of 7 Old Jan 8th, 2006, 1:37 pm
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Quote:
Originally Posted by bob_menton
First: they're not "radiators", they're "convectors". They transfer excess heat out of the engine by means of convection - they don't run nearly hot enough to transfer much heat via radiation.- Bob
You are absolutely correct Bob. However, this "battle" was lost decades ago, and now radiator is the accepted term for automotive use, incorrect as it may be.

More recently we lost the battle between "feathering" and "cupping" for motorcycle tires. Even a couple tire manufacturer's have fallen into the trap, so I guess we will just have to learn to live with people using the term "cupping", wrong as it may be.

I am sure you also remember when the term "Gay" was a positive word and had no negative meaning?

The english language is in a constant mode of change, much of it STUPIDITY incarnated. I guess it is like water, always seeking the lowest possible level.

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post #6 of 7 Old Jan 8th, 2006, 5:06 pm
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Bob:
Got one of those non contact thermometers. You are welcome to borrow it anytime you want to get to the bottom of this mystery. Couple of points concerning the use of that type of a temperature indicating device. Angles and distance will make a difference in readings. Texture and color will also have an effect. One thing, try not to fall on your butt anymore, it's already got a big crack in it and it'll probably bust next time.
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post #7 of 7 Old Jan 8th, 2006, 9:29 pm Thread Starter
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Thanks all, for your responses. "Radiators in series" would surely explain my observations - I was embarrassed to fall on my butt, and now I'm embarrassed that I didn't think of that. Gunny (you wise ass), we'll 'shoot' my radiators with your non-contact thermometer when we do some other kind of shooting later this year - thanks.

- Bob

Cowboy Bob Menton
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