VS LPG Thermostat Temp

[JustaNoviceCarDude]

Gday All,



Im looking for the optimum thermostat opening temp for an LPG fuelled ecotec?

Im thinking an 82 degree thermostat would be suitable but I’m no expert.

Would appreciate any advice.

Cheers

 

[J_D 2.0]

Not too sure on ecotec but I run a 71 degree thermostat on my SSV. LPG is a hotter burning fuel than petrol so running a cooler thermostat than stock is advantageous IMO.

Even though I’m running a 71 degree thermostat the oil temp runs at around 102-108 degrees when fully warmed up. Of course there is a slight downside on the cooler thermostat which is that it takes longer to warm up on cold mornings.

 

[jeepster]

Gday All,



Im looking for the optimum thermostat opening temp for an LPG fuelled ecotec?

Im thinking an 82 degree thermostat would be suitable but I’m no expert.

Would appreciate any advice.

Cheers

I use 82 degree thermostat. LPG doesn't need higher temperature. It will not really matter if you are in stop-start traffic mostly because it will warm up anyway. I only run on petrol occassionally to stop the tank going stale.

 

[BlackVXGTS]

The Holden VS Service manual doesn't show and difference in the thermostat or cooling system requirements (other than hoses) for the V6 whether petrol or LPG. The only difference in the specification section is the spark plug gap of 1.4mm (standard 1.5mm).

From the internet:
CNG has a peak flame temperature of 1790°C/3254°F which is 187°C/337°F (9.5%) cooler than the peak flame temperature of gasoline at 1977°C/3591°F. The peak flame temperature of LPG at 1991°C/3614°F is only 13°C/23°F (less than 1%) higher than gasoline.

 

[J_D 2.0]

CNG has a peak flame temperature of 1790°C/3254°F which is 187°C/337°F (9.5%) cooler than the peak flame temperature of gasoline at 1977°C/3591°F. The peak flame temperature of LPG at 1991°C/3614°F is only 13°C/23°F (less than 1%) higher than gasoline.

That may be true but LPG is also a slower burning fuel than petrol so there is less dwell time between combustion cycles. As to how much difference that makes I’m not too sure but it could be significant.

Dwell time between combustion events is the only reason your engine isn’t a puddle of molten metal on the ground after you run it for a while as the melting point of aluminium and steel is a lot lower than the combustion temperature of close to 2000 degrees.

Anecdotally I’ve noticed that the temp gauge on my SSV does sit a bit higher when I’m running on LPG vs running on petrol.