Engine types

[IB]

Hello

Could someone tell me what is the difference between a tdi and a tdci, and is there a tddi. Also is one type any better or worst than the other.


Thanks
IB

[GBBiker]

TDi is the Di engine from the MK3-5 era with a turbo bolted on. Stands for Turbo Direct Injection.

TDDi is MK6 era. Stands for Turbo Diesel Direct Injection.

TDCi is MK7 era. Stands for Turbo Diesel Commonrail Injection. (Commonrail injection being a Renault invention btw )

[AndyG]

Di was available from MK2

MK6s used both Tddi and TDCI

MK7s are all TDCIs

And

(Commonrail injection being a Renault invention btw )

I don't think so

[GBBiker]

And

(Commonrail injection being a Renault invention btw )

I don't think so

Do your research Andy


Renault patented the commonrail diesel technology way back. They sold licences to other manufacturers.

[barabas]

Depends on which specific commonrail technology you're referring to. Vickers used to make commonrail diesels for subs as far back as 1916. The modern day commonrail was developed by some swiss boffins in the 60's, then the japs were first to use it in commercial road vehicle production in the 90's, then it was further refined by fiat who in turn flogged it wholesale to bosch.... dunno where renault come into it

[barabas]

Oops, sorry for the post hijacking I would say the tdi is the best but then I am a diehard Mk5 fan...

[GBBiker]

the japs were first to use it in commercial road vehicle production in the 90's

Which Japs and which cars then?

[AndyG]

And

(Commonrail injection being a Renault invention btw )

I don't think so

Do your research Andy


Renault patented the commonrail diesel technology way back. They sold licences to other manufacturers.

Why should I do research
You've made the statement, now back it up

[barabas]

the japs were first to use it in commercial road vehicle production in the 90's

Which Japs and which cars then?

Hino Motors (a subsidiary of Toyota) used it on their Ranger trucks in japan and the US, still do in fact.

[GBBiker]

Why should I do research
You've made the statement, now back it up

Why should I have to back it up? You don't have any evidence to disprove what I said

[IB]

Hello

Thanks for all the replies. So which would be the best engine to go for, would a tdi on the older engine be more reliable than the tdci on the newer engine. Are common rail engines more fuel efficent and what are the newer engines like to work on from a mechanics point of view?

Thanks
IB

[Jim Archer]

'Common rail' types are more efficient, quieter and more power. Being as how they've electrickery involved in their operation they are prone to sensor failure, and thus the ECU spitting it's dummy and sulking if anything isn't just right.

DI types more robust and tolerant, but are reliant on timing being correct and fuel supply consistant.

Ref the 'common rail' arguement - 'common rail' injection has been around for almost as long as the diesel engine, big pump pressurises a pipe with an accumulator (piston and a big spring) on the end to maintain a constant pressure, lobe(s) on camshaft opens injector(s) at appropriate moment.

Electronic system was as said before, thought up by a German(?) fella in the 60's, and taken on by the Swiss Automotive Institute. 1st commercial use by Hino. Not really any better than DI as it only uses solenoids triggered in the same way as a petrol igntion system

Fiat did most of the work on ECU controlled stuff, but sold to Bosch when they had money troubles - ironic really, what a money spinner that would have been - Bosch did all the detail work. Early ones still had mechanical parts in the system - turbo boost/MAP sensing etc - but later stuff more and more electronic sensors and controls as CPU speeds and processing developed. Alfa (Fiat) JTD, Merc CDI, and Volvo/Penta were 1st mainstream uses.

Main development has been the high pressure pump, the ones for petrol injection systems just ain't man enough. Everything else is as per petrol/spark ignition injection.

Jim