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Old 08-30-2007, 07:50 AM   #1
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Default Reversing the Water flow in the engine

Ok, so I've got a 55mm Koyo Racing Aluminium Radiator, A 13 Row Mocal Oil cooler, and 2 high speed SPAL fans.

I'm still not happy with my overall water temp at idle in traffic, the damn radiator is just too big for street. Then I hear some pals telling me to reverse the flow of the water in the engine, so that the 4th cylinder gets the coolest water FIRST, before the rest of the engine.

Questions:
1.Has anyone done this modification and does it actually work? My pal did this on a NB and NC and he swears by it.

2. Next in line for more cooling mods was probably going to be 2 small fans for the oil cooler. The question is - would computer fans work? Or can anyone point me to where I can find 2 small fans that would work with the Mocal's rectangular shape.
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Old 08-30-2007, 08:43 AM   #2
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Just wondering what Water temp. are you getting while idling in the traffic(Nice Asian Summer weather) ??

I am having the same problem, I just choose not to take the car out!

next thing I'll do its to put a few role of louvers such heat could escape from under the hood, and keep the heat exchange circulating while its stuck in traffic under the sun.

Last edited by Mimime; 08-30-2007 at 09:02 AM.
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Old 08-30-2007, 09:20 AM   #3
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You need to do a search for a "coolant reroute". Instead of reversing the flow you put the flow into the back of the head instead of the front.
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Old 08-30-2007, 10:05 AM   #4
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i run the all metal automatic factory radiator and have never had a problem with my coolant temps. i did the coolant reroute on my car, here's a link to diagrams and some pics of mine on my site. http://www.miatamx5.com/coolantreroute/index.html
the piping and thermo housing will all be redone shortly by TurboTim(ShoreMotorsports), we got some trick setup planned.
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Old 08-30-2007, 03:12 PM   #5
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If you have two Spals and a 55mm Koyo, and you're not happy with coolant temps, you have other issues. I have a 57mm CSF and the stock fans and the only times I've ever see the needle move past 12pm was on the track in 95-110 degree heat.
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Old 08-30-2007, 03:53 PM   #6
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the design of the waterpump would prevent you from flowing water the way you want....but what you can do is search "coolant reroute"

but you shouldn't have any problems idling within range with your mods. are you sure its not full of air pockets? you should be at 87-98C at idle.


https://www.miataturbo.net/general-miata-chat-9/beginning-my-spacerless-coolant-reroute-12027/
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Old 08-30-2007, 04:09 PM   #7
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Quote:
Originally Posted by Savington View Post
I have a 57mm CSF and the stock fans and the only times I've ever see the needle move past 12pm was on the track in 95-110 degree heat.
Is this on the stock, unmodified temp gauge, or has it been linearized?
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Old 08-30-2007, 04:13 PM   #8
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Speaking of linearized gauges, i did that mod to my temp gauge and now it goes to 12 noon on startup and never moves. Think i need to return it to stock.
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Old 08-30-2007, 04:38 PM   #9
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Is this on the stock, unmodified temp gauge, or has it been linearized?
Stock unmodified. I really should linearize it. I know that it starts to move again around 220 degrees, so as soon as it moves I lift off the gas.

On the laptop through the MS, I've seen up to 215 in 110+ degree heat on the highway, but I also have a 27" intercooler blocking all the airflow to the radiator.

Eventually I want to send the cluster off to miatagauges.com and have them drop a couple of analog 270 degree sweep VDO gauges into the stock locations.
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Old 08-31-2007, 12:33 AM   #10
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Quote:
Originally Posted by Mimime View Post
Just wondering what Water temp. are you getting while idling in the traffic(Nice Asian Summer weather) ??

next thing I'll do its to put a few role of louvers such heat could escape from under the hood, and keep the heat exchange circulating while its stuck in traffic under the sun.
Well, Im using a Pivot water temp gauge that taps off the ECU. This gauge is consistently higher than the readings off my Link Display, by about 2-3 degrees celsius. The pivot actually takes readings off the stock water temp sensor located at the back of the 4th cylinder.
On most applications I see around 88 to 95 degrees celsius. Whe I am stuck in traffic jams, the temp goes to about 104 degrees celsius. Please remember that Im in Singapore with high temperatures and high humidity.
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Old 08-31-2007, 12:36 AM   #11
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Quote:
Originally Posted by Braineack View Post
the design of the waterpump would prevent you from flowing water the way you want....but what you can do is search "coolant reroute"

but you shouldn't have any problems idling within range with your mods. are you sure its not full of air pockets? you should be at 87-98C at idle.


https://www.miataturbo.net/showthread.php?t=12027

I'm getting about there at idle. When I'm stuck in traffic, it can go up to about 105ish.

Sorry about the confusion, yes, my pal did mean coolant reroute. Sorry about that guys
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Old 08-31-2007, 12:38 AM   #12
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Quote:
Originally Posted by Savington View Post
If you have two Spals and a 55mm Koyo, and you're not happy with coolant temps, you have other issues. I have a 57mm CSF and the stock fans and the only times I've ever see the needle move past 12pm was on the track in 95-110 degree heat.
I get about 105 degrees celcius off the pivot gauge tapping off the stock temp sensor. Link display shows me about 103. Only in traffic when i'm caught in a jam. my needle only starts to go past 12 o clock when the car hits 115 or so
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Old 08-31-2007, 12:39 AM   #13
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Quote:
Originally Posted by qes78 View Post
Well, Im using a Pivot water temp gauge that taps off the ECU. This gauge is consistently higher than the readings off my Link Display, by about 2-3 degrees celsius. The pivot actually takes readings off the stock water temp sensor located at the back of the 4th cylinder.
On most applications I see around 88 to 95 degrees celsius. Whe I am stuck in traffic jams, the temp goes to about 104 degrees celsius. Please remember that Im in Singapore with high temperatures and high humidity.
I am also using the Pivot, but just its Tap in the front Rad hose. 84-87 C. reading from there. A friend has the same set up as you, has the same reading and up to 104 occasionally in the traffic (HOng KOng).
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Old 08-31-2007, 12:39 AM   #14
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Quote:
Originally Posted by paul View Post
i run the all metal automatic factory radiator and have never had a problem with my coolant temps. i did the coolant reroute on my car, here's a link to diagrams and some pics of mine on my site. http://www.miatamx5.com/coolantreroute/index.html
the piping and thermo housing will all be redone shortly by TurboTim(ShoreMotorsports), we got some trick setup planned.
Thank you!
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Old 08-31-2007, 08:24 AM   #15
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you could try changing your idle timing on Zi100 - increasing mine from ~6.5* to 13.0* helped the typical coolant temp to drop 2-4*C ... it was up to 100* or so before.

easy change to make too
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Old 08-31-2007, 10:36 AM   #16
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jif that sounds interesting

qes78 - will your fans bring the temp down to the point where they will shut off when stopped in traffic?
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Old 08-31-2007, 11:56 AM   #17
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Quote:
Originally Posted by qes78 View Post
I get about 105 degrees celcius off the pivot gauge tapping off the stock temp sensor. Link display shows me about 103. Only in traffic when i'm caught in a jam. my needle only starts to go past 12 o clock when the car hits 115 or so
The only place I'm able to obtain a reading when the needle goes past 12 o'clock is on the track, and tech inspection won't let me put my laptop in the car to log it.
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Old 08-31-2007, 01:18 PM   #18
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The only place I'm able to obtain a reading when the needle goes past 12 o'clock is on the track, and tech inspection won't let me put my laptop in the car to log it.
Start up datalog, put laptop in backpack, stuff under passenger seat... go out for a session
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Old 08-31-2007, 01:49 PM   #19
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Quote:
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The only place I'm able to obtain a reading when the needle goes past 12 o'clock is on the track, and tech inspection won't let me put my laptop in the car to log it.
You need a palm then. They're around $40 on ebay it appears.
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Old 08-31-2007, 02:27 PM   #20
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Can Palm be connected to Emanage Ultimate?
Does it have USB and can it run EMU software?

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