I would call that EGR or exhaust gas recirculation. Again not something to sing from the roof tops about, its been around for donkeys years...

Edit bit late with my reply

Edited 1 March, 201214 yr by al_kaholik

but to your average joe Twinport sounds exciting! twin air on the other hand......

twin air on the other hand......

Yet strangely, Twinair is far more exciting.

GRAAAAAAAAAABAPBAP GRAAAAAAAAAAAA GRAAAAAARRRRGHHHHH

I've got a 500 Twinair outside at the moment, it's really slow but it's so noisy, short geared and punchy in the mid range that it feels like a warm hatch. Hilarious little thing!

I've never heard anyone say "sound's like a golf" other than on that advert, and if any of my mates started slamming the door of my brand new car as hard as they could thinking they were funny they'd be met with a hay maker and a walk home

And I thought some of my mates were bellends

I have it was when a mates open tool bag went flying down a stair well, and the comment sounds like a golf was appropriately used.

twin air on the other hand......

Yet strangely, Twinair is far more exciting.

GRAAAAAAAAAABAPBAP GRAAAAAAAAAAAA GRAAAAAARRRRGHHHHH

I've got a 500 Twinair outside at the moment, it's really slow but it's so noisy, short geared and punchy in the mid range that it feels like a warm hatch. Hilarious little thing!

dunno if you will be able to see this link but it goes into details of all of the sytems on the twinair engine.

twin air on the other hand......

Yet strangely, Twinair is far more exciting.

GRAAAAAAAAAABAPBAP GRAAAAAAAAAAAA GRAAAAAARRRRGHHHHH

I've got a 500 Twinair outside at the moment, it's really slow but it's so noisy, short geared and punchy in the mid range that it feels like a warm hatch. Hilarious little thing!

dunno if you will be able to see this link but it goes into details of all of the sytems on the twinair engine.

Nope, can't get in.

bugger! was a Fiat UNetVersity document on the twinair talking about its mechanical hydraulic solenoid variable valve lift system meaning there is no need for a throttle body.

The Fiat document sounds interesting I'd you can get a copy of it. I have to keep bringing myself up to speed with some of these things. My industry's technology moves fast but it has a long lifecycle, the automotive industry on the other hand in the last 10 years has seen a huge transformation akin to that of communications and electronics.

Still though I'm messing around with 4 cylinder boxer engines, though granted with some modern trickery, its basically a 70+ year old design. Things like the twin air and the mpg possible from a modern petrol flex what advancements have been made

Twinair is clever but ultimately it's a tax dodge.

Driven calmly to work earlier I got 43mpg out of it. I bet the G wouldn't be far off driven the same economy.

Doesn't matter in the UK or most of Europe though because low CO2 means low tax. Especially for company cars. Real world economy is important but companies can shed loads of cost through using vehicles with high claimed economy.

The reality is different though. Small engines usually have to be worked harder to get anywhere, so end up being not that much more economical than your standard engine sizes. I've had 1.6 and 2.0 versions of the Peugeot 508 in on test for example, and one of the 1.6 engines was an e-HDI unit. They all averaged 48-50mpg.

I'm starting to notice there's a limit for achievable economy of about 50mpg for Passat sized cars, 55 for Polo/Golf (Eco Golfs tend to have bigger engines and six gears) and 58-60 for small stuff with a diesel engine.

Anything claimed to be higher doesn't usually come close on the road.

Tangent much?

unfortunately I cant sort out the fiat document as its protected by something or other. drove from my house to beaulieu yesterday and did about 45mpg, I reckon I could have got more if I was more careful and mines a 1.4 16v most I have had is low 50s out of it.

That fiesta looks decent from behind, but pure filth from the front!

unfortunately I cant sort out the fiat document as its protected by something or other. drove from my house to beaulieu yesterday and did about 45mpg, I reckon I could have got more if I was more careful and mines a 1.4 16v most I have had is low 50s out of it.

You can get all sorts of silly economy if you hypermile a car. I squeezed 76mpg out of an Ibiza Ecomotive on the launch- the best figure of anyone who went. The SEAT PR guy tweeted about it - of all the attendees the last person he expected to get highest MPG was the writer from Max Power :-)

But the rule of thumb stands under normal driving. By which I mean keeping pace with traffic away from roundabouts and cruising at normal speeds, with air con. There's only been one car that's really shocked me so far, and that's the BMW 520d EfficientDynamics. A 185bhp executive saloon that beat the Polo Bluemotion on a similar run.

Kettering to Heathrow on £8 of fuel, at the time.