Thread: Diesel in a 101

Why not go to a 3.5 injected from about 86/7 Range Rover, BHP went from 125 @ 4000rpm in HC carby form to 165 BHP @ 4000 rpm in injected form and torque went from 185 @ 2500 Carby to 206 @ 3200 Injected,still fairly simple without to much electronics and not a lot of gas conv work to to it, it would probably only need heads and cam to achieve the results,or a good S/hand motor.

Thanks Uncle Ho - the issue relates to fuel consumption and range in remote locations. I am happy with the 3.5 as it is for non remote areas. However if I was to go to all the expense of changing an engine - doesn't matter whether petrol or diesel I would expect an improvement in performance or otherwise there is little point. As I indicated I am just after peoples thought on suitable diesels. There are lots of cheap non rover options for petrol engines but I would still need to load up with a heap of 44s to get the range needed in remote areas.

Cheers

Garry

I'm wondering about the gear stick replicator mechanism and whether it would foul on the EFI plenum?

What about using a complete 3.9 EFI V8 from a Range Rover or Disco? The serpentine belt may even make a few things easier, if they clear the front diff etc.

In relation to range, I thought the EFI engines were a little more economical than the carby engines, even with the increased performance

It would be hard to go past a 4BD1T. As JC mentioned, it would eat ANY rover V8 you care to put in if tuned and geared correctly.

To sort the gearing, you can buy any retio from 7.17:1 to 3.54:1 for the diffs from the US quite cheaply (Dana 60). 4.3:1 would probably be a good option...

Originally Posted by isuzurover

It would be hard to go past a 4BD1T. As JC mentioned, it would eat ANY rover V8 you care to put in if tuned and geared correctly.

To sort the gearing, you can buy any retio from 7.17:1 to 3.54:1 for the diffs from the US quite cheaply (Dana 60). 4.3:1 would probably be a good option...

Ben

The issue of diesel Vs rover V8 (and I acknowledge Garry's question only relates to the former) is that a Rover V8 will not require, any modification to the engine mounts, no modification to the exhaust or any alternative bellhousing and will essentially be the same weight. Four things that the 4BD1/4BD1-T or 4BD2-T will require.

Also if you up the ratio on the diffs, will the diff centres remain the same? As we know the 101 has larger diameter halfshafts.

And

When you up the diff ratio you also up the low ratio reducing the crawler capability, something that swapping the LT95 ratios doesn't do.

But as I have said earlier in the thread, for a choice of diesel - I would go 4BD1-T too!
Diana

Personally I think you maybe trying to crack a to hard a nut.

The modern diesels are great, very good power but at a cost.

you will always burn more fuel to get more HP, Although the new jap diesels punt along very well they are not having to actually move much.

I would sagest that the potential fuel economy would fly out the window.
I had a ford ranger ute for a bit, 12ltrs per 100 empty to port Lincoln, 19 ltrs per hundred coming back with only 800kg on the back. But sheeesh it could fly.
And then with any diesel, at best you will be giving away 25% of your rev range and that’s a big deal when coming to sand etc.

The economy you quoted i think would only improve a bit with a high comp rover

Originally Posted by 85 county

you will always burn more fuel to get more HP, Although the new jap diesels punt along very well they are not having to actually move much.

Not true - modern diesels burn the fuel more efficiently than the old ones so in some aspects you can have your cake and eat it too. Overall my RRS TDV6 2.7 is averaging 8.6 l/100km pulling its 2.6tonnes (with me in it - was on a weigh bridge the other day) around - producing 140kw etc. Overall this is better than my 1.8 tonne 2 litre Freelander in similar conditions.

If you are more efficient, you do not have to burn more fuel to get the same power.

Garry

Originally Posted by Lotz-A-Landies

Also if you up the ratio on the diffs, will the diff centres remain the same? As we know the 101 has larger diameter halfshafts.

There are only 2 different carrier types - 4.56:1 and numerically lower and 4.1 and numerically higher.

So you can change ratios between 7.17:1 and 4.56:1 without changing the centre. If you want to go 4.1 or higher you would need to swap your 21-spline 101 side gears (OEM or ARB/JM) into a different centre (either a 3.54 rover centre or ARB/JM...).

It goes without saying that ANY engine swap to anything other than a rover V8 will not be bolt in. IME the 101 springs are fairly stiff, so may not be much of an issue - a reset will probably be sufficient.

The 4BD1/T has the best brake specific fuel consumption of any diesel available at the time, however I am not sure how it compares to modern diesels. I doubt it would be far off.

Another option would probably be a 4JB1T or 4JG2T (Rodeo/jackaroo 2.8 or 3.1 diesel). There should be bellhousing adaptor kits available from the UK. These have a higher rev range than the 4BD1, and can be tweaked to the same level of performance as a tweaked TD5.