XUD vs HDi

[uhn113x]

Windoze 2000 and XP pro are very stable (speaking as a professional software developer)
You need to get rid of the Windows for Teletubbies appearance on the latter, though.

[Thunderbird]

Why wasn't this topic locked?
Edit. <b><i>You "dug it up" from ages ago, what job do you do? Gravedigger?</i></b> [:(!]

[turbolag]

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by broomie</i>

HDi = no or less head gasket problems/ How so ? I am intrigued!
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">Lower HDi compression ratio is the main contributory factor.
A good decat, filter and remap will have a swift, frugal and relaiable 140-150bhp, which was far beyond sensible XUD tuning limits.

[Huskyxantia]

I've xud and hdi... I know this threads old but .. Hdi good , xud of mine is better on mpg ... but it depends where you live and drive.

Both engines are good xud is simple old school workings hdi bit more electrical stuff but very similar lump.

This was a very interesting thread.

[Peter.N.]

I ran XUD engines for many years and miles, mostly the XUD11 in the XM which was definitely an improvement over the 9. The redesigned cooling system almost eliminated head gasket failures and the economy was brilliant, the introduction of laminated steel head gaskets more or less overcame any problems left.

The Hdi engine is certainly more economical and reliable - with the possible exception of the 1.6, the only thing I don't like about it is it's flexibility compared with the XUD 11 particularly, the XM would pull down almost to tickover speed and accelerate away with no fuss, the Hdi on the other hand vibrates if you try to pull hard below 1500 rpm so you have to do more gear changing. I suspect that the flywheel was heavier on the XUD. Apart from that I think they are probably the best diesel around and very few head gasket failures.

Peter

[white exec]

Another difference is that the XUDs were indirect injection, where HDi is direct injection. DI engines seem generally more harsh and prone to low-rev vibration, which is probably why we got lumbered with dual-mass flywheels.

Agree with Peter about the smooth availability of power on XUD (and the slightly larger 2.5 DK5), and the need for fewer down-shifts.

[Peter.N.]

The Hdi seems to rev more freely Chris, almost like a petrol engine, which is one of the reasons I think it probably has a lighter flywheel. The direct injection certainly gives better fuel consumption but it hasn't got quite the same low down torque of especially the XUD 11.

I had a 220 cd Merc before the C5 and it was rubbish in comparison except for the engine, it felt as though it would climb up a wall, I kept stalling the C5 when I first had it , very little torque at the bottom end but pulls like a train when you get the revs up.

Peter

[CitroJim]

I always see HDi as having the best attributes of both the 1.9 and 2.1 TD XUDs...

You're right Peter, it's a very free revver like the 1.9TD and torquey like the 2.1TD...

And just like the XUDs it's proved itself to be more or less bullet-proof too!

Another advantage of the HDi is how easy, compared to the TD XUDs, cambelt replacement is

[Peter.N.]

I haven't changed one on an Hdi yet Jim, mine haven't done enough miles - although they are old enough. Keep putting it off.

Peter

[CitroJim]

I haven't changed one on an Hdi yet Jim, mine haven't done enough miles - although they are old enough. Keep putting it off.

When you do Peter you'll be very happy at the ease.. It's not much more than doing an 8 valve XU petrol engine, in my book the easiest, along with the 8V TU

[Peter.N.]

Thanks Jim. What's a petrol engine?

I've done one on the 8 valve in the 406 but not on the 16 valve.

Peter

[CitroJim]

Thanks Jim. What's a petrol engine?

I guess you've not run a petrol engined car since the 50s have you Peter?

[Peter.N.]

I think the last one I had Jim had a carburettor, distributer and quite likely a dynamo. I ran my first diesel in 1959, put a Perkins 4/99 in a vauxhall Velox. I have run Citroen/Peugeot diesels since the '80s.

Peter

[CitroJim]

You ran your first diesel in the year I was born Peter!

[admiral51]

I agree with Peter, the HDi does feel more like a petrol and mine does not produce any black smoke, yes a bit of a haze in darkness can be seen by the lights of the following vehicle as you give it some beans but other than that no way to tell its a Diesel.
However it can be remapped