coolant flow - (follow up to cooling diagram)

[widdowson2008]

[mikeonb4c]

There is all sorts of other stuff in the way to soak up any possible heat radiated back towards the engine from the rad Mike, including an intercooler, steering rack, etc, don't forget there's also a cowling aroung the back of the rad too. Ain't no blackbodies radiating down there

Kool (no pun intended)

[widdowson2008]

I give up

[mikeonb4c]

The baffle is nowhere near the rad, it's behind the front wheels, so there would be no relation between it the rad, I think it's probably just there as a crap deflector.

Black body radiation travels, so just as with visible radiation (like the beam from a torch), if the rad or the air between it and the 'torch' can see it, it gets light (heated) up. But I'm sure your right - its really there just as a crud shield. Mind you, 'every little helps' as Tesco like to remind us.

Mike, treat me as thick - no problem with that. But, WTF is Black body radiation???????? in very simple terms

Infra red radiation (radiated heat). It consists of electromagnetic waves exactly the same as visible light only the wavelength is longer than the eye can detect (although night vision goggles etc. are designed to work with it). Commonly called 'black body radiation' (I think) as it occurs most effectively (and most strikingly, because black is anything BUT glowing) when the surface of the body has no reflective quality likely to reflect the radiation back into the interior. The reverse demonstration of this is the mirror like space blanket, which is designed to reflect back into the occupants body any radiated heat which might otherwise escape. Clouds perform a similar function at night, trapping heat energy radiated from the ground and thus slowing down the rate of cooling of the air mass between the ground and the clouds. Its the reason that frosts generally occur on clear nights.

Here's an interesting heater that uses the black body principle:

http://cgi.ebay.co.uk/Campingaz-blue-ca ... 20af860252

...and those heating pipes you get in warehouses, garden centres etc. are another example

I seem to recall my racing car mates painting bits of their engines with heat resistant matt black to encourage cooling by black body radiation

[widdowson2008]

[mikeonb4c]

Thought it sounded a little like a rascist comment at first

Nope - just plain old pseudo scientific jargon

[widdowson2008]

[mikexgough]

Definition...............

Pseudoscientific Jargon is the use of scientific sounding terminology to describe essentially pseudoscientific phenomena. Commonly, the goal of a pseudoscientist's use of such technical jargon is to overwhelm a laymen audience, so that the laymen audience may say "that sounds scientific" and buy into the pseudoscientific theory. Sometimes the use of pseudoscientific jargon is deliberate, as in the case of a con artist trying to sell quack medicine, or the use may be forgivable, as in the case of pseudoscientist trying to develop a new theory of the universe or mind without any post-high school education.

or in other words.............. posh words for Bull S*it............ .......... Snake oil .........

More info Here............. Pseudoscientificjargon

[mikeonb4c]

Definition...............

Pseudoscientific Jargon is the use of scientific sounding terminology to describe essentially pseudoscientific phenomena. Commonly, the goal of a pseudoscientist's use of such technical jargon is to overwhelm a laymen audience, so that the laymen audience may say "that sounds scientific" and buy into the pseudoscientific theory. Sometimes the use of pseudoscientific jargon is deliberate, as in the case of a con artist trying to sell quack medicine, or the use may be forgivable, as in the case of pseudoscientist trying to develop a new theory of the universe or mind without any post-high school education.

or in other words.............. posh words for Bull S*it............ .......... Snake oil .........

More info Here............. Pseudoscientificjargon

Amazing! Don't suppose you'd believe me if I told you I made that expression up on the spot, unaware it had a formal connotation

In which case of course, I meant it tongue in cheek:

http://en.wikipedia.org/wiki/Black-body_radiation

definitely not quackery

[g8dhe]

Try this explanation its much simpler and understandable by most

[mikeonb4c]

Try this explanation its much simpler and understandable by most

Thanks Geoff. But if you'd only said:

This rearranges to lp = 2.898 x 10-3 / T

...it would have been so much simpler

[widdowson2008]

[The Great Pretender]

Definition...............

Pseudoscientific Jargon is the use of scientific sounding terminology to describe essentially pseudoscientific phenomena. Commonly, the goal of a pseudoscientist's use of such technical jargon is to overwhelm a laymen audience, so that the laymen audience may say "that sounds scientific" and buy into the pseudoscientific theory.

Understand it now................Just like global warming..............

[widdowson2008]

Beginning to understand M 80NGD

[waycar8]

Thought I will add a bit to the stat situation.


Had a blue print stat (or another cheaper make type) in 2 years ago when I did the last coolant change well when I bought the bongo, had a small coolant loss for a while now, couldnt find a leak anywhere in the hoses, never overheated so started to think head gasket , so bought some red coolant that glows under uv light and topped up using that, finally found the leak under the front heater matrix, the hose that connects to the metal pipe was weaping around the seam.

I was layed up for 2 weeks and the bongo never moved (it was when we had freezing temps and all the snow), well once I could move about abit I had to go to the bank to pay in a cheque, went out started the bongo up left it running for half an hr, then drove it to the local town just a mile away, 3 minutes later pulled into the town car park and started to smell coolant throught the heaters, the mason alarm wasnt screaming or the temperature needle wasnt going into the red so parked up lifted the bonnet and coolant was leaking out from the rad cap.

Well topped up with coolant and went to the bank, called in at the local garage on the way home dropped off the bongo and asked him to sort the coolant leak on the pipe and get a new rad cap as the spring part was all loose, (its a 1.1 spring loaded type) and asked him to bleed the system as it emptied the expansion bottle below the minimum and got a taxi home, as I wasnt up to doing it myself , well 3 days later I phoned to see if he had sorted it and he said yes, so went to pick it up, and found all he had done was change the rad cap and that was it , I asked why he hadnt done the leak and he said you always get some seapage around the coolant pipes , asked if hed bled it and he said no, got it up to temperature a couple of times and it presurising ok and not kicking out any coolant

So I just left it at that and decided to wait a couple of weeks and do it myself, after reading the info regarding mazda stats compared to blue print, I came to the conclusion of changing it to a mazda stat just to see what happens, curiosity more than anything as I knew my stat was working fine.

Jamie and Ady came over to help this weekend and we did a flush, coolant change and changed the stat to the mazda one, and sorted the leak. Tested the stats together and noticed the mazda one opened quicker than the blue print one slightly, what we did notice was there was a dirty ring on the center pin when the stat was opened fully, we theorised that once the stat is opened fully and the coolant is circulating it may be picking up bits of crap that circulating in the system and collecting in the edge, then when it shuts it could be getting trapped and slowing the stats opening and shutting capability? over time?

as seen in the pictures already the mazda stat has a cone shaped pin and has a rubber seal type ring at the bottom, I lifted it slightly to see if it had any reason why it should be there as it dosent seem to be relevent with anything to do with the stat housing ect, and what it seemed with what we theorised with the dirt ring theory is the mazda stat has the rubber ring around it to clean the pin as its opening and closing and the cone shaped pin stops the rubber going to far up the pin?

Just theory mind you but made sense to us at the time , and there wasnt or seemed to be any difference in running temperatures either, as I took it for a drive towards work which i do every day and the needle went to the same positions as it did with the blue print one

Just like to say thanks to Jamie and Ady for there help this weekend