Water injection competing in 80 years

[Woodcutter]

[...] (here to continue, it must be assumed that the engine in question does not lack air (partly replaced by steam)) [...]

You suppose well!
Indeed, given the boost pressures applied, we can consider that the engine does not lack air.

[Woodcutter]

[...] Here in A8 the cars are more efficient than that of loeb, [...]

The WRCs in 2005 configuration are not necessarily more efficient than those in 2006 configuration, as we can see on the heats of the World Cup, even if the very good performances of Dani Sordo for example could possibly be explained by this "evolution gap "...

[bolt]

I'm sure even christophe in person can't follow

it was there

Hello
to lower the T ° by 12 ° C on intake, roughly 2 liters of water at 20 ° C per hour are required for 100 hp (i.e. 10 L / hour for 500 hp) assuming all the time injected. assuming, as André said, that all the water has evaporated before entering the engine (for my calculation) In reality, I don't know: it depends on the size of the water droplets

And indeed, it may be that there is a percentage of water that is misused (not completely during admission, but well used during the continuation: compression and relaxation)
So more than 10 L / (h.500 hp): 10 liters evaporated in the admit pipe. plus a few liters entering the cylinders in the form of micro-droplets.

To see their 12 liters of water tank, for how long they had, knowing that they only used it at times (how long in% according to you, econology)

For zac: can you have information on all this by your neighbor (well equipped): flow rate, injection pressure, injector system (or water nebulizer), maximum water consumption per second during of a full load. Does he have a technical sheet?

bolt

[Christophe]

To see their 12 liters of water tank, for how long they had, knowing that they only used it at times (how long in% according to you, econology)

1) According to an old memory of an engine course, the average load of an F1 during a GP is between 35 and 40% (if Bucheron has more precise figures ... I agree) over the duration of the great price (pit stop not included I think) ... assuming that water injection is only used above 50% there is not much time left when it is not used. ..but impossible to say that like that since we only have the trigger boost pressure: 2,5 Bars

2) Was the amount of water related to the capacity of the fuel tank (in the 100 L)? In other words: were they filling up with water at the same time as petrol? If yes that would allow us to have a more precise report ... otherwise we would also have an idea (if the 12 L are consumed during the GP obviously ...) reported to the overall consumption of the GP (Bucheron at the foot !)

There are a lot of unknowns so as not to speculate on ... so information from the neighbor of Zac would be welcome ...

3) For the 10L / h for 500 cv.h (I trust you on the calculations, I suppose that you started from the air flow rates necessary for the stochiometry by fixing a constant average engine performance?) That can stick ( we are in the order of magnitude at least), Bucheron, a great price how long does it last?

[Woodcutter]

To see their 12 liters of water tank, for how long they had, knowing that they only used it at times (how long in% according to you, econology)

1) According to an old memory of an engine course, the average load of an F1 during a GP is between 35 and 40% (if Bucheron has more precise figures ... I agree) over the duration of the great price (pit stop not included I think) ... assuming that water injection is only used above 50% there is not much time left when it is not used. ..but impossible to say that like that since we only have the trigger boost pressure: 2,5 Bars

It can go much higher for certain "critical" Grand Prix like Monza for example where there, the time of full load (accelerator at bottom) can reach 70% of the total time.
It also evolves with the engines ... For example this year, the V8 are more often than the V10 of 2005.
So to give full load times in the 80's, not simple ... I would still lean for a little more than 35 to 40%.

2) Was the amount of water related to the capacity of the fuel tank (in the 100 L)? In other words: were they filling up with water at the same time as petrol? If yes that would allow us to have a more precise report ... otherwise we would also have an idea (if the 12 L are consumed during the GP obviously ...) reported to the overall consumption of the GP (Bucheron at the foot !)

The refueling in water during the grand prix gave rise to a cheating that remained famous in the annals of F1, by the Tyrrell team, in 1983 precisely .... But it was with a V8 atmo (they were the last to use it).

Here, I think your weight of 600 kg is wrong for F1 in those years, I remember 540 kg.

Anyway, I don't seem to remember that the other teams were filling up with water along the way, so I would say it's 12 liters for the entire race.

3) For the 10L / h for 500 cv.h (I trust you on the calculations, I suppose that you started from the air flow rates necessary for the stochiometry by fixing a constant average engine performance?) That can stick ( we are in the order of magnitude at least), Bucheron, a great price how long does it last?

A Grand Prix lasts 305 km + 1 lap or a maximum of 2 hours, the first of the two terms expired.

[bolt]

therefore 10 L / hx 2 hx 40% = 8 liters necessary for cooling

If their tank was just empty at the end of the race, it can be assumed that the additional 4 liters ended their beneficial cooling effect during compression or combustion

I suppose that the engineer mechanics of these cars know all that by heart, should invite them to discuss on the forum

bolt

[Christophe]

The following is available: water injection by Ferrari

Ferrari announced 10% water proportion ... but injected as an emulsion in petrol! (it reminds you nothing )

An article on water injection by SAAB ... for the general public is on fire with some curves.

[Other]

Hello
The water injection at Ferrari was a mixture of petrol and water of the order of 10%
And we with a panton for a consumption of 6.5 liters road and 7,5 liters city in the best have arrived around 0,7 liters of water per 100km and 0,8 liters.
Was the 10% limit due to air saturation in humidity or loss of efficiency in the combustion cycle?
It is true that it is on petrol engines, a downstream diesel much more air.

Andre

[Woodcutter]

[...] It can go much higher for certain "critical" Grand Prix like Monza for example where there, the time of full load (accelerator at bottom) can reach 70% of the total time.
It also evolves with the engines ... For example this year, the V8 are more often than the V10 of 2005. [...]

Illustration for the Silverstone GP Sunday 11/06: full load time this year = 71%, full load time last year = 59% ...

[Christophe]

Illustration for the Silverstone GP Sunday 11/06: full load time this year = 71%, full load time last year = 59% ...

Impressing the difference ... zon flange the engines or it is the weather conditions + favorable?