Bongo Fury

widdowson2008 wrote:Geoff
How did you arrive at that path? Was it a guesstimate? or do you know summat I don't? Certainly looks a possible goer.
Having said that, it isn't quite the same shape (inlet/outlet pipes). Is this a pattern part?

Purely a guesstimate and the photo came from a posting by Mikexgough back in September

Thanks Geoff.
Just got pics from Helen. If folk thought I was a 'ripper', just wait 'till you see these. Matrix TOTALLY in bits.
Like someone said earlier, 'Helen, you're only supposed to blow the bloody doors off'

I'll sort the 'cuts' out and get back.

Not sorted flow out yet, but here are the pics from Helen that I'm working on.

MATRIX INFO
Thickness: Tank 54mm, Matrix 45
Width 216 mm
Height 164 mm
The above measurements refer to the matrix as it sits in the vehicle.
Tubes run horizontally, as it sits in the vehicle, with stubs going through the bulkhead on the passenger side.
Tubes run completely through with no interruption, save the plastic "Sine wave" shaped rod.
In the pictures you will see that on the stub side, the tank is split along its vertical length, and the stub is moulded inside the tank to divert the flow straight across the end of the core tubes.
At the other end, the tank is plain , and relies on the pressure of the flow through the one half of the matrix, to continue the flow out of the other tubes on the other side.














In contrast to Geoffs (very logical) suggestion of the flow path where the matrix tubes were divided horizontally into 2 banks of 6, these pics show that tubes are actually split vertically. Two columns at the rear and one column at the front.
A check of the Lushproject drawings will show which is the flow in and which the flow out, which is my next job.
Edit: 2 tube section IN, 1 tube section OUT

Think I might have just sorted the flow - off to do a diagram

ps. Helen - there isn't some sort of copyright attached to these pics of yours, is there?

pps. Thanks for the effort Helen.

Hi Steve
I'll do as you requested, and stick it all back together with masking tape, and photo it together......oooooohhh...wait a minute, I sent you some pictures of the whole heater a couple of days ago....but I'll still do that tomorrow...It's 4.15 PM here now (2.15 your time), and I've been cooking up a Chicken Phal......can't wait

Cheers
Helen

helen&tony wrote: ......and photo it together......oooooohhh...wait a minute, I sent you some pictures of the whole heater a couple of days ago.......Cheers
Helen

Sorry Helen , Like you said you sent 'em, and I just found 'em, so no need to reassemble the bits, but thanks anyway.

Hi Steve
O.K.
I have the heater in the workshop still, so ask if you want more.....
Cheers
Helen

From the pics and discussions with Helen (her what chopped it up ), this is the way I understand the flow through the heater matrix.

Drawn to scale. For an idea of physical size, the tubes are 6.5mm bore.

Shown looking from the top.

One bank of 12 pipes IN.
2 banks of 12 pipes OUT.

widdowson2008 wrote:From the pics and discussions with Helen (her what chopped it up ), this is the way I understand the flow through the heater matrix.

Drawn to scale. For an idea of physical size, the tubes are 6.5mm bore.

Shown looking from the top.

One bank of 12 pipes IN.
2 banks of 12 pipes OUT.

Looked good dinnit? Nice and straightforward(ish). However, as normal when investigating Bongo bits, there is a twist. The flow path is a tad more complex than shown. Helen has made yet further cuts and found summat else - yet another deviation. This flow pattern changes half way down the rad. Sort of switches round. Can't explain in words so I'll have to do another pic.

'twould be nice if someone with heat exchanger knowledge can explain it to the rest of us when I get the sequence sorted.

He He even the books on the matter call it an ART see the summary section

Some heavy maths in there Geoff. Gave up quite quickly I'm afraid

So are we saying that we don't have any heat exchanger boffins in the clan? That surprises me

Front heater internals.
This is a true representation of the front heater internals.
Notice the combined feed/return tank internal divider. It splits the tubes up as follows:
19 tube feed (red), 17 tube return (blue).
The tubes are 6.5mm bore.
What we need now is for someone to tell us how/why Mazda arrived at a 19/17 split, and why.

Just been informed that I may have got the flow/return the wrong way round. Anyone confirm which connection comes from the driver side? (inlet), top or bottom?
The drawing remains correct - just which way round the flow is that's in question.

i would love to help steve,but the X factors on tele

yes steve you have em wrong.top to stat.

widdowson2008 wrote:Front heater internals.
This is a true representation of the front heater internals.
Notice the combined feed/return tank internal divider. It splits the tubes up as follows:
19 tube feed (red), 17 tube return (blue).
The tubes are 6.5mm bore.
What we need now is for someone to tell us how/why Mazda arrived at a 19/17 split, and why.

Might it to be that there is not the chance for a partial vacuum to be formed with there being always an 'oversupply' of water to the return section rather than the converse, also the cooler water will be denser than the warm water, so will take up less volume in the system, which the imbalance in the number of tubes will take account of?

Just theorising!