FIAT JTD info?

[The_Dark_Side]

As the FIAT JTD range of engines is one that I have no experience or knowldege of, I wondered if any of you guys are aware of any associated horror stories with it? Not the car that's wrapped around it, just the engine please.

 

[MarkDavis]

No horror stories. Fiat more or less pioneered the 1st implementation of common rail in large scale production cars, so had a head start in terms of development time and reliability (in contrast to the horrendous Twin Sparks in Alfa Romeos which they never got right). The JTDs are actually decent engines, particularly the higher powered versions. Not as good as a BMW 330d or the Honda 2.2 unit, but pretty good as far as mainstream car diesel engines go. And reliable too. The only thing to watch out for is that the belts need to be replaced slightly earlier than the recommended 60k.

There's good info here about the JTD / JTDm in the Alfa Romeo but its the practically the same engine as used in Fiats, albeit in a different state of tune. http://www.alfaworkshop.co.uk/jtd_engine.shtml

The Saab 9-3 saloon also uses the 150bhp 1.9 version of the JTD engine as do some Vauxhalls. It's not an engine that has a reputation for going 'pop'.

 

[BigglesPiP]

The Saab 9-3 saloon also uses the 150bhp 1.9 version of the JTD engine as do some Vauxhalls. It's not an engine that has a reputation for going 'pop'.

And Alfaromeo are getting the 190bhp version of that engine, saab will have it in 180bhp form too.

The JTD-m/multijet is the most advanced diesel in mass production, bar none! It is as reliable as you need, comes in several different states of tune depending on what you buy it in.

As mentioned, FIAT have been ahead of the game with diesel for a long time, the 1st direct injection diesel on the roads was the old Croma, and they were 1st to the market with these new high pressure diesels.

If you are interested in the technical bits, the multijet makes 5 injections per cycle.

1. Pre-injection (heat the air to take the knock off).
2. Another pre-injection.
3. Main charge.
--- at this point the acceleration of the piston down the bore is measured ---
4. Correction injection, smoothness .
5. Post injection when cold to heat up the CAT.


Edit: Beware of BMW's figures, they have a business practice of publishing figures obtained from their lighter more aerodynamic cars, so the mpg figures are to be taken with a shovel of salt.