OT Never mind the super railway-

[Dave Plowman (News)]

The fact remains you are far more likely to see a diesel belching out smoke than a petrol. Keeping them to spec seems to be far more difficult than petrol.

[ARW]

Mine was in your area on the 17th of October. I was on my way to Watford at about 8pm.

[ARW]

I had lots of police zooming down both sides of the motorway. The same sign was showing on the opposite carriageway.

Police practice?

[ARW]

I used that road a quite a bit a few years ago when I was working in Washington.

It's a fast road.

[Vir Campestris]

Perhaps you should investigate what Mazda are doing that allows them to run 15:1 compression on a petrol engine.

They really are doing things differently. Their latest _petrol_ engine has a mix of spark and compression ignition.

Andy

[tabbypurr]

I see you also failed to grasp what I said. They've worked out how to push petrol harder. You can always push diesel harder still, as whatever tricks you use to prevent premature ignition, diesel can go further in that respect.

NT

[polygonum_on_google]

But you have quoted a carbon mo noxide limit when the point, as I read it, was the carbon dioxide emissions.

[harry]

These days, it's largely because there is more energy in diesel then petrol.

[harry]

It's more down to direct injection (of fuel into the cylinder.)

[bert]

LPG was even better.

[Bob Eager]

The point was 'pollutant'. CO2 emissions are broadly the same for a given size of petrol or diesel engine.

[Pancho]

Are you sure. Are these figures independently tested, actually enforced in reality. Are they tested in the MOT?

We have been lied to about diesels before, quoting some theoretical limits doesn't instil confidence. Without reliable enforcement they are probably still as much a fiction as they used to be.

[ARW]

The special school near me has a sign that says "Slow Children Crossing"

[tabbypurr]

how would it make any sense to try to ban diesels becuase the fuel is a bit more energy dense?

[tabbypurr]

I guess I can't expect you to comprehend what was said.

[tabbypurr]

Not at all, a 1.7 diesel is normally a lot more efficient than a 1.7 petrol. That means less CO2 per mile. Diesels win by miles on CO2. Hence greens are against it.

NT

[bert]

Or one I saw saying "Heavy Plant Crossing" Didn't know trees could walk.

[Steve Walker]

Have you never seen a Triffid?

SteveW

[Pancho]

Of course not, he was blinded by the comet shower.

[bert]

Good point. Didn't they go over a cliff edge?