coolant flow - (follow up to cooling diagram)

[The Great Pretender]

LOL............ya were to quick......................

[stilldesperate]

Ta

[widdowson2008]

LOL............ya were to quick......................

One tries

Actually, I'm getting pretty s**t hot with this photobucket thing I gotta say. Had a whole shedload of problems understanding it at first.

ALSO, I have just finished the first set of stat tests and am trying to get them straight in my mind before posting.
Initially, they look pretty much what you may expect. A couple of blips to think about first.
Back soon.

[widdowson2008]

Stat heat tests (2 done so far - had to clean the wifes pan and cooker so she dont know)
The thermostat, in both tests followed the same curve (almost a straight line ignoring small blips - probably human error)

Test 1
- start to open at 83 deg C
- fully open at 94 deg C
- fully closed at 84 deg C

Test 2
- start to open at 84 deg C
- fully open at 94 deg C
- fully closed at 86 deg C
heat re-applied
- start to open at 84 deg C

From graphs plotted, it can be seen, in both tests, that they open and close at the same sort of rate. ie:no lag.

One thing I did note was that the lift recorded over a temperature span was 10mm in both tests. This is both outside the spec of 8.5mm AND at temperatures BELOW 100.
This could be a little worrying as at this point (10mm), the mechanism is dangerously close to locking in the open position. This based on actual physical dimensions taken of the disembowelled stat. Need to, and WILL check this carefully.

[The Great Pretender]

LOL............ya were to quick......................

One tries

Actually, I'm getting pretty s**t hot with this photobucket thing I gotta say. Had a whole shedload of problems understanding it at first.

ALSO, I have just finished the first set of stat tests and am trying to get them straight in my mind before posting.
Initially, they look pretty much what you may expect. A couple of blips to think about first.
Back soon.

Tests...........remember them when I used to print colour photo's, getting the filtration was fun, keeping the chemicals at the correct temp was a bu--er................

The stat housing looks a clever piece of kit as it needs to provide a suitable resistance to all the parts communicating with it.
Visualisation of flow over the stat is now possible making it easier to understand its operation.
Good luck with the tests. But until there is real time testing of all the pipework communicating with the stat we will not understand it fully.

[The Great Pretender]

Stat heat tests (2 done so far - had to clean the wifes pan and cooker so she dont know)
The thermostat, in both tests followed the same curve (almost a straight line ignoring small blips - probably human error)

Test 1
- start to open at 83 deg C
- fully open at 94 deg C
- fully closed at 84 deg C

Test 2
- start to open at 84 deg C
- fully open at 94 deg C
- fully closed at 86 deg C
heat re-applied
- start to open at 84 deg C

From graphs plotted, it can be seen, in both tests, that they open and close at the same sort of rate. ie:no lag.

One thing I did note was that the lift recorded over a temperature span was 10mm in both tests. This is both outside the spec of 8.5mm AND at temperatures BELOW 100.
This could be a little worrying as at this point (10mm), the mechanism is dangerously close to locking in the open position. This based on actual physical dimensions taken of the disembowelled stat. Need to, and WILL check this carefully.

Missing the 4th dimension.....................

[widdowson2008]

LOL............ya were to quick......................

One tries

Actually, I'm getting pretty s**t hot with this photobucket thing I gotta say. Had a whole shedload of problems understanding it at first.

ALSO, I have just finished the first set of stat tests and am trying to get them straight in my mind before posting.
Initially, they look pretty much what you may expect. A couple of blips to think about first.
Back soon.

Tests...........remember them when I used to print colour photo's, getting the filtration was fun, keeping the chemicals at the correct temp was a bu--er................

The stat housing looks a clever piece of kit as it needs to provide a suitable resistance to all the parts communicating with it.
Visualisation of flow over the stat is now possible making it easier to understand its operation.
Good luck with the tests. But until there is real time testing of all the pipework communicating with the stat we will not understand it fully.

You want to see the STAT. Now that IS a piece of precision machining and design that a bloke like you would REALLY appreciate. Superb.

[maxheadroom]

widdowson2008 great thread
can I ask what thermostat you are testing? it's just I replaced mine 20 months ago with a cheap one, anyway after 12 months I started to have boiling water coming out of the header tank. It started in April 09 and over the summer and up until Oct 09 I had 6 overheating / boiling water coming out of the header tank.
The last one being 100 miles from home, so on the side of the road I took the stat out cut the gubbings out of the middle and replaced the seal ring and drove home and like that for a month , Well with winter coming no heaters or antifreeze I fitted four silicon hoses, pink antifreeze and a new genuine Mazda thermostat fingers crossed six weeks later no problems .
So could it have been a cheap stat?
Just a thought and keep up the great thread.

PS boiling over after Bongo had been under load i.e. up hill or in traffic.

[missfixit70]

widdowson2008 great thread
can I ask what thermostat you are testing? it's just I replaced mine 20 months ago with a cheap one, anyway after 12 months I started to have boiling water coming out of the header tank. It started in April 09 and over the summer and up until Oct 09 I had 6 overheating / boiling water coming out of the header tank.
The last one being 100 miles from home, so on the side of the road I took the stat out cut the gubbings out of the middle and replaced the seal ring and drove home and like that for a month , Well with winter coming no heaters or antifreeze I fitted four silicon hoses, pink antifreeze and a new genuine Mazda thermostat fingers crossed six weeks later no problems .
So could it have been a cheap stat?
Just a thought and keep up the great thread.

PS boiling over after Bongo had been under load i.e. up hill or in traffic.

Sounds like it failed closed, so you're probably right, cheap stat is probably something to look out for. I put a "Blueprint" one in mine, do you know what make the cheap one was?

[widdowson2008]

widdowson2008 great thread
can I ask what thermostat you are testing? it's just I replaced mine 20 months ago with a cheap one, anyway after 12 months I started to have boiling water coming out of the header tank. It started in April 09 and over the summer and up until Oct 09 I had 6 overheating / boiling water coming out of the header tank.
The last one being 100 miles from home, so on the side of the road I took the stat out cut the gubbings out of the middle and replaced the seal ring and drove home and like that for a month , Well with winter coming no heaters or antifreeze I fitted four silicon hoses, pink antifreeze and a new genuine Mazda thermostat fingers crossed six weeks later no problems .
So could it have been a cheap stat?
Just a thought and keep up the great thread.

PS boiling over after Bongo had been under load i.e. up hill or in traffic.

Hi Max - sorry I'm late getting back (bloody customers and Christmas preparation in some sort of conspiracy)
Thanks for the compliment but all I am doing is stringing together information others are providing so the compliment should be to them, not me.
Can't give any informed opinions on your boiling problems I'm afraid cos I'm still on the learning curve myself at the moment. (I see Kirsty has replied before I got here)
The stats I tested , 2 so far, were both Blueprint ADM59208 as sold in Bongoshop. One was brand new, the other used (no idea of history of used one) The Blueprint is an extremely well engineered stat - very impressive.

On the operation of the coolant system, the text received so far is of a high quality with slight differences of opinion (but no agro). The problem is that the slight differences of opinion all sound logical (though folk are re-writing as we speak - determined to get to the end). We are devising a way to test these differences and come to an agreement. As I said, fun & games but no agro.

[maxheadroom]

sounds like it failed closed, so you're probably right, cheap stat is probably something to look out for. I put a "Blueprint" one in mine, do you know what make the cheap one was?

Sorry Kirsty can't remember I've had one or two sleeps since then but it was from one of the very popular eBay sellers.

[maxheadroom]

The Blueprint is an extremely well engineered stat - very impressive.

I must say the genuine Mazda one is by far better engineered than the cheap one, so I would say to anyone buying a new thermostat is pay the extra.
I think I payed around £26 delivered from eBay, so far money well spent

[widdowson2008]

The Blueprint is an extremely well engineered stat - very impressive.

I must say the genuine Mazda one is by far better engineered than the cheap one, so I would say to anyone buying a new thermostat is pay the extra.
I think I payed around £26 delivered from eBay, so far money well spent

Considering what it does, £26 well spent. Knowing what I now know, when I change mine, I would certainly pay that price for peace of mind alone - no question.

[Doone]

The stats I tested, 2 so far... the other used (no idea of history of used one)

If it's the stat that Allan sent to you (along with the thermostat housing) then all he knows of its history is that it came from a 'running hot but not overheated' (faulty rad) Bongo.

[widdowson2008]

The stats I tested, 2 so far... the other used (no idea of history of used one)

If it's the stat that Allan sent to you (along with the thermostat housing) then all he knows of its history is that it came from a 'running hot but not overheated' (faulty rad) Bongo.

Thanks Lorna. And yes, it is the one Allan donated. I can now add that info to the stat data.
I don't know how old it is, but it behaved in the same manner as the new one so it appears to be undamaged (or it was 'till I attacked it!!!!!) However, although it may have died at my hands, valuable information was gathered in the process - mainly dimensional.