Post-Turbo exhaust design

[Holm86]

Another interesting one:

5.8.1 With the exception of incidental leakage through joints (either into or out of the system), all (and only) the fluids entering the compressor inlet must exit from the engine exhaust system.

Does this mean water/alcohol injection is legal?? If its just sprayed into the compressor inlet??

[Holm86]

Please read the updated regulations, they say :

"5.8.2 Engine exhaust systems must have only a single tailpipe exit which must be rearward facing and through which all exhaust gases must pass."

Oops, so I have an old copy here.

Yes it was updated in July this year

[raymondu999]

Does that single tailpipe also include the exit for the turbo wastegate?

[WhiteBlue]

Another interesting one:

5.8.1 With the exception of incidental leakage through joints (either into or out of the system), all (and only) the fluids entering the compressor inlet must exit from the engine exhaust system.

Does this mean water/alcohol injection is legal?? If its just sprayed into the compressor inlet??

Exhaust gas is the only fluid allowed in my view. Any fuel is definitely prohibited, like alcohol.
Water would reduce the temperature of the exhaust gas at the turbine entry and that is not some thing you want.

[Holm86]

Does that single tailpipe also include the exit for the turbo wastegate?

Yes. That should be pretty clear. It says all exhaust gasses. So if there is a wastegate you must route the dumped gasses back into that exhaust pipe. It cant have a seperate exit.

[Holm86]

Water would reduce the temperature of the exhaust gas at the turbine entry and that is not some thing you want.

Perhaps it would cool the exhaust temperatures a bit. But it would add more flow volume. It would also cool the intake air.

[WhiteBlue]

I doubt it. How would it cool the intake air?

[wuzak]

Another interesting one:

5.8.1 With the exception of incidental leakage through joints (either into or out of the system), all (and only) the fluids entering the compressor inlet must exit from the engine exhaust system.

Does this mean water/alcohol injection is legal?? If its just sprayed into the compressor inlet??

I suppose you could do it, but why would you want to? I'd have to look through to see if that is explicitly banned. Certainly I would think methanol would not be allowed, as it is a fuel, which does not conform to the regs.

Usually water/methanol injection is to control detonation. It doesn't help the power (except to allow higher boost) or efficiency .

[wuzak]

I doubt it. How would it cool the intake air?

Do the words heat of evaporation mean anything to you?

No doubt that it would cool the air as it passes through the compressor - but at what cost?

The amount of water that goes through the compressor displaces air, so less air to the engine, means less fuel and less power. Unless you crank up the pressure ratio, at which point you lose out on potential heat energy recovery.

[Holm86]

It is a very fine mist. I wouldnt take up any air space. It saturates the air and cools it increasing its density.

[Holm86]

Usually water/methanol injection is to control detonation. It doesn't help the power (except to allow higher boost) or efficiency .

And why wouldnt you want to increase efficiency?? In a fuel capped competition higher efficiency means more power from the given fuel quantity.

http://en.wikipedia.org/wiki/Water_injection_(engines)

[wuzak]

Usually water/methanol injection is to control detonation. It doesn't help the power (except to allow higher boost) or efficiency .

And why wouldnt you want to increase efficiency?? In a fuel capped competition higher efficiency means more power from the given fuel quantity.

http://en.wikipedia.org/wiki/Water_injection_(engines)

I don't believe it increases efficiency.

[Holm86]

Usually water/methanol injection is to control detonation. It doesn't help the power (except to allow higher boost) or efficiency .

And why wouldnt you want to increase efficiency?? In a fuel capped competition higher efficiency means more power from the given fuel quantity.

http://en.wikipedia.org/wiki/Water_injection_(engines)

I don't believe it increases efficiency.

Ahh i misunderstod. But i do. Higher density means you can run lower boost. Lower temperatures mean you can run higher CR.

[Richard]

This sounds familiar - albeit nothing to do with exhausts...

http://www.f1technical.net/forum/viewto ... f=4&t=4943
http://www.aquamist.co.uk/dc/coollinks3 ... nault.html

[Holm86]

No nothing to do with exhausts. It just came up during conversation. But it doesn't belong in that topic either. It could be moved to the 2014 Engine thread.