Thread: Tdi Replacement engine

Originally Posted by slug_burner

80 thou, approx 2mm, only 1mm off the cylinder wall. I'd like to think that there was more cylinder wall thickness than 2-4 mm. You would have to have a bad casting to be so unlucky.

Do 300 tdi's have liners? I guess not!

Well, you need a certain amount of wall thickness to maintain integrity and trueness under temperature and cylinder pressures, (bores go out of round pretty easily, it's why race engines are honed with a torque plate to simulate the head being bolted down)

Add to that core shift (not unheard of in Tdi's, Serg has seen a few examples at a well known Land Rover specialist) and i'd be testing a block for wall thickness before boring, particular that far. (which i wouldn't do anyway, and I'm the bloke that used to run 0W-5 engine oil at only 35psi/6500 RPM in race engines, so it's not like I haven't pushed the limits before)

Oh, and we are talking about overboring 2.5mm, that's 100thou.....
Not for this little Black Duck......

The reason I was looking at doing the 2.8l conversion is due to the cost being roughly the same as rebuilding the 2,5l.

I still have 2 outstanding question which nobody has answered. Please provide an answer on:

1. Who in the Sydney area does engineering on Tdi's including rebore
2. What are the chances of me doing the rebuild myself

Please let me know.

Has anyonr done a VNT on a stock Tdi and if so what was the result.

Thx to everyone who has posted replies.

Lets look at this... just the bits that go up-n-down-round-n-round...

The cost of gietting the 2.8 kit in will really only be similar if you need a new crank and or rods.

If your crank and rods are good, to rebuild the 2.5 will only cost:
1/ bore/hone of the pots
2/ new pistons
3/ crank linish / grind
4/ block clean/ welsh plugs
5/ cam linish with new bearings
6/ new main & bigend bearings

All apart from 2,3 &6 you would need to do for the conversion.
The above machine work cost about ~$500 in Cairns at the only engine workshop in town. Im sure in Sydney someone will know a reputable machine shop that can do it for that sort of price. The new bits 2,5 & 6 will cost a whole lot less than a $2800 kit.

In regards to doing it yourself. The tdi really is a pretty simple engine. Everyone has to have a first! Get the 300tdi engine overhaul manual and go for it (can email it if you want) and the uk website difflock has some good info...

In regards to 300tdi VNT there are numerous threads.
XrayXray installed the Allisport VNT kit
Jock has installed the MD VNT kit
and Bush65 is experienced, knowledgable and helpful in regards to VNTs...

cya
Steve

Thx Steve, you have convinced me to have a go.

I would appreciate it if you could send me the engine overhaul manual. Are the engine bits sold from aftermarket retailers in Sydney the same quality as original LR part?


It sounds like the real power increase comes from the VNT etc rather than the 2.8l conversion.

I assume due to wear and tear I would have to fit slightly oversize pistons, is that correct?

Yes the need for what oversize will be determined by how much wear there is and how much they have to take the bores out by. May need to get the machine shop to tell you what oversize you will need.

The quality of parts is generally safe if you buy original. As LR probably don't make their own pistons and rings it might be a case of getting the bits from the original equipment supplier. Following up one of the manufacturers named earlier in this thread KOLBENSCHMIDT, they have agents in Sydney:

BT Oceania Pty Ltd

Street 33 Mill Drive
City North Rocks, NSW
2151


They do the pistons, rings and water pump for the 300 tdi.

I have never used their parts nor do I have any association with them. I suspect that there are other suppliers better known to the LR community in Sydney.

at the very least also allow for:

a new HD rad core,
new aftermarket temp gauge, somthing with actual degrees on it not just hot or cold
decent exhaust
egt gauge if you dont have one already
vent engine bay

if you can, new larger intercooler

Serg

What is the HD rad core you are referring to? Is this the radiator core? I replaced the radiator 5,000km ago.

engineering shops in Sydney???