Range Rover 3.9 to 4.6 conversion

Lasse Kristensen · Post by **Lasse Kristensen** » Thu Mar 31, 2011 7:18 pm

Hello all.
As mentioned in another thread, I have a 3,9 Range Rover which needs a bit of TLC. I have another 3,9 in the garage, which only needs a new waterpump. I thought about upgrading the camshaft thoug.
Then I came across a salvage yard, who has a LSE 4,6 litre standing, with 105.000km on the clock.
How much work is it to swap the 3,9 for this engine? I think I figured this much out :
Sump and oil pickup pipe from 3,9.
Serpentine front end from 3,9 - if I continue to drive EFi? Does it run well with the 3,9 EFi? Or would it be easier to maintain the 4,6 standard injection?
Thanks in advance for the help.

ChrisJC · Post by **ChrisJC** » Fri Apr 01, 2011 7:14 am

LSE 4.6??, the RR Classic LSE was 4.2. The P38 was the first 4.6. The answer to your question is very dependent on which one it is.....

Chris.

Lasse Kristensen · Post by **Lasse Kristensen** » Fri Apr 01, 2011 2:42 pm

Hello.
Oh yeah, meant P38. Hmm I haven't had a closer look at it yet... They describe it as 4.6EDC4 225bhp (year 2000)... Another salvage yard has this 4,6 litre : SALLPAMJ4VA357100 (year 1997).

ChrisJC · Post by **ChrisJC** » Sun Apr 03, 2011 8:02 am

To use the 4.6, you would need to keep the following from the 3.9:
Sump
Front cover & ancillaries
Inlet manifold & injection system

You would need to change the camshaft (and followers) for one suitable for driving a distributor.
You would need a spacer on the crankshaft at the pulley end (it is like a sleeve about 30mm long)

I don't know how well the 3.9EFi system would work on the 4.6. Maybe a MegaSquirt ECU would allow you to remap it properly.

Chris.

Lasse Kristensen · Post by **Lasse Kristensen** » Tue Apr 05, 2011 7:26 pm

Hi.
Okay, thanks. The spacer will need to be fabricated or? I haven't dismantled my 3,9 yet. I'll see what the asking price for the 4,6 is. Megasquirt would be an option yes, I know a few people who meddles with these DIY Ucu's...

ChrisJC · Post by **ChrisJC** » Wed Apr 06, 2011 6:57 am

The spacer looks like this:

I don't have the dimensions, but I reckon you could work them out easily enough.

Chris.

ged · Post by **ged** » Wed Apr 06, 2011 5:45 pm

Here's a rough sketch of the one I made for mine.

Lasse Kristensen · Post by **Lasse Kristensen** » Fri Apr 08, 2011 3:40 pm

Hello.
Thanks, that should be possible to manufacture

.