>>The "i" means intercooled not injection.<< Is that still true for 'SDi' - as in the thread title ? I didn't think there was an intercooler without forced induction.
Don't know about other makes, but SDi Rovers were turbo'd with intercoolers. SD ones were turbo'd without intercoolers. They later changed it to TD & TDi so really depends on the manufacturers own terminology.
|
And if I may add my own questions to this thread:
Is the VAG 1.9 SDi engine a PD (i.e. high pressure diesel) without a turbo, or is it an old fashioned (there must be a technical word, but I don't know it) diesel?
And what does SDi stand for anyway?
|
SDi-engined cars are of course cheaper than their TDi equivalents, so the manufacturer plugs another market niche and might get another sale...
In 2003 I ran an SDi Polo for 23k miles over 8 months up and down the M40; it was a perfectly good engine for cruising and did around 50mpg. The TDi Polo was well over UK£1000 more expensive I recall.
|
"And what does SDi stand for anyway? "
SlowDireInjection ;-)
Far better as a TDi.
|
|
|
|
|
I think you will find it was SD1 as opposed to SDi.
|
|
Useless fact probably, but PD = Pumpe Düse, which literally, seems to mean Nozzle Pumps!
|
Makes sense to me, almost all the minicabs round here in Glasgow are SDi models, probably spend 95% of their lives simple trailing between the city centre and whatever suburb they are based in - for which purposes, I guess 64bhp is perfectly adequate. They're also cheap as chips to buy and run, and as the examples mentioned above show, look after them right and you can run them to the moon.
I think it's a pretty staggering achievement, the fact that they are capable of such mileages and that minicab drivers still buy them mean they must be fairly reliable and up to the job.
In terms of fuel consumption, I don't think it's necessarily the case that losing the turbo makes them more economical - some turbos I would have thought had the advantage there as the engine is not having to be revved quite so hard to get anything out of it.
Also, does a turbo, by it's nature, not improve emissions in some cases - better to have a small turbo diesel with the same output than a larger naturally aspirated one? I had always thought that this is the reason we see so few unblown diesels in passenger cars now. Migh tbe wrong though!
To this end, I'm always slightly surprised that the Octavia doesn't have the VAG 1.4TDi unit fitted over the bigger SDi. I guess the bigger engine is under less stress in these specific operating conditions.
|
Just to confuse you my mate has a Astra DI 16V which has a turbo
I always thought that SDI meant supercharged but I know its not now. Am I rigth in thinking that Mazda did a supercharged diesel in the mid 90's in the 626?
|
|
Aye, the 626 supercharged diesel was called 'comprex' but its output was poor by todays standards and it was only in production for something like 15 months.
|
|
|
|
I think you will find it was SD1 as opposed to SDi.
I think he means later (post-SD1) Rovers. There never was an SD1 SDi ......
Must lie down.
|
|
You're right, I was thinking of that VM engined SD1. Apologies to Morgie.
|
|
|
|
|
|
