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Technical Optimal Coolant TEMP TWINAIR PANDA 312 CNG

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Technical Optimal Coolant TEMP TWINAIR PANDA 312 CNG

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Ilias Tsiftsian

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Hello to the forum.
Owner of Panda 312 CNG TA with 146k kms on the clock. Yesterday i bought a obd HUD because the car has no Coolant temp info. The car rolling with light load and 2k rpm the temp stays at about 72C. My experience says that it is not normal...anyone changed a thermostat so he can fill me up with some info? Thank you in advance.
 
Yeap there is no temp gauge. Where the temp gauge were now there is CNG volume info. I really don't understand this.


Apparently 60 To 80'c is 'normal' ... Really? Had several cars before , most of them were turbocharged. All of them working @90+ Celsius.
 
Commonrail diesels produce less excessive heat so for them 60 -80 degrees coolant temp is allright. I think CNG burns hotter than petrol (I know LPG does) so I'd expect temp between 80 - 100 degrees. What is the openingtemperature for the thermostat in a Twinair? My 100Hp is at 88 degrees and a 1.4 Tjet 80 degrees.

gr J
 
Hi.
I'd be hoping for 90-95c running temperature. If it is too cool there is less chance of contaminates boiling off from the oil as it too doesn't get hot enough. You'll see mayo (white sludge) on the oil filler cap and most likely on the inner surface of the cam cover. I wonder if that's the reason many TA's struggle on MOT emissions.
 
Ilias Tsiftsian said:
Yeap there is no temp gauge. Where the temp gauge were now there is CNG volume info. I really don't understand this.


Apparently 60 To 80'c is 'normal' ... Really? Had several cars before , most of them were turbocharged. All of them working @90+ Celsius.
Click to expand...
I understand it. The gauge shows ‘cold’ until the engine’s warm. But once warm the gauge (on my 4x4 diesel) doesn’t move: hot or cold weather, full load uphil or freewheeling down... it just stays in the middle showing ‘normal’ ( i suspect the middle bar of the gauge covers a span of temperatures). So, not being told the exact temperature , but instead being able to see how much CNG gas remains is probably more useful.
 
Last edited:
Haha, yeah i think its more useful to know how much Cng is inside the tank. Still car in working conditions highway with 130-150 kph is @74-75C , on the other hand when im stuck in traffic works @85-87C. I really cannot understand this temperature. I am working with diesel engines as a technical manager in a Scania and Iveco workshop and i see temps around 90-95 degrees. Yes we are not talking about diesel engines , its a Cng/Petrol engine. Ι am going to search a little more about Cng and give further info. I would really like to know about the twinair petrol engine coolant temp though.
 
Ilias Tsiftsian said:
Haha, yeah i think its more useful to know how much Cng is inside the tank. Still car in working conditions highway with 130-150 kph is @74-75C , on the other hand when im stuck in traffic works @85-87C. I really cannot understand this temperature. I am working with diesel engines as a technical manager in a Scania and Iveco workshop and i see temps around 90-95 degrees. Yes we are not talking about diesel engines , its a Cng/Petrol engine. Ι am going to search a little more about Cng and give further info. I would really like to know about the twinair petrol engine coolant temp though.
Click to expand...
I have the impression that the same will be the case with mine which is new.
This is because I feel that the air from the heat ventilators is quite cold when in the middle and going with 90-100km/h, while when in traffic I feel it is hotter.

I will have to connect the OBD to measure.
 
Herts Hillhopper said:
I understand it. The gauge shows ‘cold’ until the engine’s warm. But once warm the gauge (on my 4x4 diesel) doesn’t move: hot or cold weather, full load uphil or freewheeling down... it just stays in the middle showing ‘normal’ ( i suspect the middle bar of the gauge covers a span of temperatures). So, not being told the exact temperature , but instead being able to see how much CNG gas remains is probably more useful.
Click to expand...


Let's hope the gauge isn't like the one on the Rover 75 that stayed in the N position between 75c & 105c
 
In a Panda it stays stationary between 80 and 100 degrees:D
But no guage is no guage. I remember my old Audi 100 (1978) that has two lights in the dash. Agreen one for cold and a red one for hot. No light was normal temp.

gr J
 
A3jeroen said:
Thermostat not closing?

gr J
Click to expand...

I thought exactly the same. But in traffic stays at 85-95....! In case of an opened thermostat it should be less. Furthermore , in highway it should be less than 70...and the car would need hours to get into 60-70 in the morning.
Maybe it works around 70-80 degrees.
 
Ilias Tsiftsian said:
I thought exactly the same. But in traffic stays at 85-95....! In case of an opened thermostat it should be less. Furthermore , in highway it should be less than 70...and the car would need hours to get into 60-70 in the morning.
Maybe it works around 70-80 degrees.
Click to expand...
I have tried the same with another turbo engine (1.4 tsi) going downhill and the minimum temperature was 72 degrees.

There is a possibility the engine is so efficient that it does not produce enough heat at the highway:)
 
Yiannis Rand said:
I have tried the same with another turbo engine (1.4 tsi) going downhill and the minimum temperature was 72 degrees.

There is a possibility the engine is so efficient that it does not produce enough heat at the highway:)
Click to expand...

Really the Tsi works that low? So the panda works normal @70-75 on highway then.It is possible.
 
After I installed a OBD2 gauge I can share some additional info.

Using CNG the water coolant temperature during the summer (25-40 degrees C) the temperature at the open road fluncuates between 75 and 80. The circuit seems to close at 75 and opens at 80. When stopped climbs to 98 degrees where the cooler fan starts to work.
The oil temperature is ussually 3 degrees below the water temperature.
 
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