Is this the signpost to madness - EU7 Content

[ralphmusic]

.. and the proposed regulations require Lambda =1.0 under all load conditions. Lambda at 1.0 = the perfect ratio of oxygen/petrol for efficient combustion, that is an air/fuel ratio of 14.7:1.0. As an example, an air/fuel of 13.0:1 would be Lambda 0.88. Petrol engines normally run "rich" at lower revs and at best ratio at higher revs.

Here is a typical dyno chart of a tuned 3.8L 911 Power Pack engine showing Lambda (oxygen/fuel ratio) rising from 0.2 to slightly over 1.0, from rich to lean.

So Lambda 1 under all load conditions would have petrol engines being fuelled and managed quite differently than today. This is Euro 7 coming to a showroom near you, all in the cause of minimal emissions by burning fuel at the perfect air/fuel ratio at all times.

 

[JohnCRS]

Reading an article on Porsche I/C engine development in response to EU7 regulations.
Basically summarised like this: horsepower is to be limited per cylinder so to maintain performance this will require:
- higher capacity
- more cylinders
- more fuel
- more CO2
- larger, heavier, more expensive catalytic converters to deal with the increased emissions.

This is nuts! The only logical explanation is that it is a way of increasing the justification to ban I/C completely

(It has confirmed my intent to never replace my current Cayman with anything that is heavier than my present car.)

 

[Motorhead]

John,

I'm afraid that it's what happens when the regulators concentrate on what's coming out of a vehicle's exhaust pipe rather than taking an holistic view of things. In other words it's important to look at total emissions from the production and recycling processes as well as the actual emissions from the vehicle itself during its lifetime. Increasing worldwide the amount of electricity generated from renewable sources will favour BEVs longer term in this respect but I'm not convinced that BEVs are significantly better than ICE vehicles right now. Like it or not, unfortunately the petrolheads are on a losing wicket.

Jeff

 

[JohnCRS]

It does seem to me that in general terms, given the same speed and distance, to move more weight you require more energy. Sure, efficiency plays a big part, but in the overall scheme of things it does not matter how the energy is produced or utilised, that only changes the variables, not the basic principle.

Therefore, to increase size, weight and energy consumption to reduce emissions is NUTS!

This applies to any vehicle, I/C, electric, hybrid.

In fact the only things I can think of that are exempt are wind propelled and the sight of land yachts on the A1 is not something I am anticipating any time soon.

If you want to see energy efficiency and ultra low emissions, plus high technology and excitement I recommend something like this https://www.youtube.com/watch?v=_UEExSQPryo

 

[jdpef356]

If you want to see energy efficiency and ultra low emissions, plus high technology and excitement I recommend something like this https://www.youtube.com/watch?v=_UEExSQPryo

I see where your coming from.

Ah Rolex, always worth a Watch[8|][8|]

 

[911hillclimber]

Isn't the hybrid that uses an ic engine to run a generator the best combo?

Engine runs at peak efficiency, single speed, best ratio, and city pollution minimised (surely THE reason IC is doomed?) and use regen braking to get some of that energy back into the battery?

No plugging in anywhere, no massive power station issues, maybe even run on biofuel in some parts of the world.

Hyper performance is now a general thing of the past, you only need 150 bhp/ton on the UK roads to 'get-along' with everyone else.

Light cars should be key too, limit the weight of cars!

 

[Motorhead]

The Colin Chapman's mantra of "Simplify, then add lightness" seems to have been forgotten these days, but then increasingly stringent crash requirements and the populace's love affair with the fully spec'd SUV haven't helped in this respect, every option probably adding weight. Now throw in a hefty battery pack and you've got a family EV with a decent range weighing-in at a lardy 1.7+ tonnes.

With current technology, unless you can build a car out of photo-voltaic cells sufficient to power it at a reasonable pace I can't think of any other way of achieving a climatically zero-impact power source for a car.

As Graham says, it would be perfectly feasible to use an IC engine in conjunction with a generator, carefully insulated and running at an optimal condition for maximum efficiency and minimum emissions [Shell Eco-marathon?], but one big disadvantage with hybrids is that you're carrying around two engines plus batteries, adding even more weight. Toyota's well tried and tested hybrid approach probably is about the best you're going to get in that respect.

I think we just have to accept that with ever increasing regulation the IC engine in cars and light vans has had its day, and VW has indicated that will not be building IC engines beyond 2026. I'm sure other manufacturers, Porsche included, will be forced to follow suit sooner or later.

Jeff