What fuel do you use in the racing.

[Czar]

OK Czar- so whens 105c reached?
Assuming thats the mid range of the gauge it can be up to 10 minutes
Yes- the exhaust runs the turbo. But then theres not a lot of exhaust if you dont accelrate due to a cold engine
So I'm sticking to let the engine warm a bit till I floor it
Problem is- if you only do small journeys for a few days- flooring its not an option
CBLUE

The afore mentioned 105°c is the temperature of the pressurised liquid cooling system, and not an indication for the actual temperature of the engine core components, that said I am not in anyway dismissing the visual aid of the cooling temperature gauge, and the recommendations associated with what is commonly referred to as "normal working temperature" however have a think about the following......

Lets take engine idle for our example, so we have 800 RPM +/- fluctuations, we have 4 strokes (induction, compression, power and exhaust expulsion) and 4 cylinders, so here's the maths:

RPM = revolutions per minute.

800/60 = 13.33 revolutions of the crankshaft per second.

The crankshaft rotates two (2) full revolutions to complete the 4 cycles (strokes) and so as we have only 1 power (firing) cycle (stroke) during the crankshafts two (2) full revolutions, this is why we have a division of two (2)

13.33/2 = 6.66 this is the amount of power (firing) cycle strokes we have per individual cylinder per second.
We have 4 cylinders and we now take our 6.66 power (firing) cycle strokes per second and multiply by the amount of cylinders to give us a collective amount of power (firing) cycle strokes per second.

6.66 X 4 = 26.66 power (firing) cycle strokes per second at our engines given idle speed of 800RPM

Lets have see what happens at:

1,000RPM = 33.33 power (firing) cycle strokes per second or 2,000 power (firing) cycle strokes per minute.

2,000RPM = 66.66 power (firing) cycle strokes per second or 4,000 power (firing) cycle strokes per minute.

3,000RPM = 100 power (firing) cycle strokes per second or 6,000 power (firing) cycle strokes per minute.

4,000RPM = 133.33 power (firing) cycle strokes per second or 8,000 power (firing) cycle strokes per minute.

5,000RPM = 166.66 power (firing) cycle strokes per second or 10,000 power (firing) cycle strokes per minute.

6,000RPM = 200 power (firing) cycle strokes per second or 12,000 power (firing) cycle strokes per minute.

6,500RPM = 216.66 power (firing) cycle strokes per second or 13,000 power (firing) cycle strokes per minute.

Furthermore to the above, each and every power (firing) cycle stroke has a temperature of 600-650°c with a collective combusted (spent) fired exhaust gas temperature of anywhere between 800-920°c for each individual cylinder, hopefully this will go someway to help in understanding that your engines core components reach their respective working thermal expansion rates far sooner than what your coolant gauge indicates!

If after all that you would like to know how soon and what coolant temperature as visually indicated by your gauge would/could it be safe to use your engines potential power, then anything above a pressurised coolant indicated temperature of 60°c

The THP cooling system has two (2) stages, first stage is a closed loop allowing fast warm up all the way to 105°c this temperature will be maintained for gentle throttle and cruising allowing for optimum economy, when anything other than gentle throttle or sustained cruising is encountered, then the second stage is opened allowing full flow reducing the pressurised coolant temperature down to 85°c when steady driving resumes then the second stage closes and the temperature will quickly return to 105°c.

In regard to there not being much exhaust gas if you don't accelerate much, the above should help with explaining that theory.

[Fabian]

I Love post like this!

Thanks Czar, realy enjoining your posts and am learning a lot

[Chris_Blue]

Yep- well written and easy to understand :redface:
CBLUE