Which is better - 2.25 petrol or 2.25 diesel?

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Originally Posted by Jojo

As said earlier, the engines are basically the same, so a swap should be not too difficult to perform. But, also as already mentioned, with a functioning petrol engine I would think about it twice. Doing the swap I mean.
Although I am a Diesel-man and honestly prefer a Diesel over any petrol powerplant I have to admit that the 2.25l Diesel will give you a new perception of speed. Or rather the opposite. It will give you the relevation of slowness. The 2.25l petrol is by no means a rocket, but the Diesel will bring this to another dimension. Sure, you'll get some more low-down grunt, but the petrol isn't that bad in this respect either. In terms of fuel economy there is surprisingly little difference between them, unlike a Tdi in comparison to, let's say, a V8. Of course a lot depends on how you want to use the car. Travelling in Diesel-only country will of course push you towards an engine swap, do you want to preserve the vehicle to go on shows, you may wish to keep it as original as possible, although the Diesel was fitted to many military models overseas. In the end, however you decide, it's horses for courses.

Cheers

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I would disagree with you on a number of your comments.

They are certainly no rocket, however a good 2.25D with improved breathing will keep up with a good 2.25P. My 2.25D has beaten equivalent vehicles with 2.25Ps up hills a few times - both driving flat out.

IDI engines are not as economical as DI engines, that is of course true. However the 2.25D has great economy. On a recent trip from Brisbane-Perth, heavily loaded, I was averaging 11 l/100km. When I had a 2.25P, I was getting 18-20 l/100 for similar driving.

I can get as low as 9l/100, whereas the best I ever got from the petrol was 17.

I removed a recently rebuit 2.25P which went like a train for a 2.25D and never regretted it.

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Originally Posted by isuzurover

I would disagree with you on a number of your comments.

They are certainly no rocket, however a good 2.25D with improved breathing will keep up with a good 2.25P. My 2.25D has beaten equivalent vehicles with 2.25Ps up hills a few times - both driving flat out.

IDI engines are not as economical as DI engines, that is of course true. However the 2.25D has great economy. On a recent trip from Brisbane-Perth, heavily loaded, I was averaging 11 l/100km. When I had a 2.25P, I was getting 18-20 l/100 for similar driving.

I can get as low as 9l/100, whereas the best I ever got from the petrol was 17.

I removed a recently rebuit 2.25P which went like a train for a 2.25D and never regretted it.

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I agree on the fuel economy. Best I have ever got with a petrol 2.25 was around 25mpg - and that was on a swb. When I had a lwb diesel, on one occasion I got 36mpg from it, and rarely got under 30mpg.

John

What is the weight difference, or is it negligible.

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Originally Posted by Brad110

What is the weight difference, or is it negligible.

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Bugger all. From memory the manual lists the diesel as ~50 kg heavier. I did not change or reset my springs between 2.25P and 2.25D.

One thing I will add to my previous comments, is not to expect a 2.25D to live any longer than a 2.25P. In fact because they are essentially the same engine, a 2.25D could be expected to need ring/bearing and head rebuilds more frequently. Purely since they have the same rev range, but the Diesel has higher pressures/stresses, plus the addition of soot to increase the rate of engine wear (better filtration , more frequent oil changes and/or oil analysis should help).

After all that, you hardly need any more convincing - but I'd go for the diesel too. I have had one for twelve years and have loved it (alright, I have spent a fair bit of that time out of the country and not actually driving it, but that's not the point). I turfed a Holden six out of the Landy in 2001 and, faced with the cost of reconditioning a motor I opted for the 2.25D over its petrol mate. It lugs beautifully, gets 30mpg and has been perfectly hassle-free. The petrol engine is wonderful and probably more resilient given some of the points already outlined, but sort out a nice diesel and take care of it and it's all happy days...

John

Sorry about hauling the old thread up from the depths [bigwhistle]
Just wondering if you guys who did the 2.25p to 2.25d swap got an engineers cert to go with it, or did you just stick it in an wing it?
Luca

I don't think any state requires such a certificate where you are changing the engine to one that was sold in the same vehicle, although where there were other changes in the one that was sold (e.g. the Six has larger brakes) you need to make these other changes as well. And note that the maximum load and towing weights change slightly.

Ah... interesting, so for a 2.6 to a 2.25 you also wouldn’t need a certificate? Despite modifications needed to engine mounts + different bell housing?
Cheers

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Originally Posted by Ypsilophora

Ah... interesting, so for a 2.6 to a 2.25 you also wouldn’t need a certificate? Despite modifications needed to engine mounts + different bell housing?
Cheers

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not so. if the chassis didnt come with the engine then you cant just drop it in without engineering for at least the welds, the 2.6 also had different brakes to the 2.25 (in some cases) However... Its a lot easier to do and have an engineer sign off on it because its already been done and approved so its not a huge amount of hoop jumping.

I had a diesel swb back in the 70's and my wife managed to do the impossible. She thought she would see what it would do and egged on by her sister flattened it down a long (very long) hill and got booked for SPEEDING.