4.6 options for D2 thor

**ozscott** · 9th October 2010, 06:22 PM

Hello all.

I know this has been done in bits and bobs before but more frequently as the years go past people are turning to a 4.6 'conversion'. As far as I can tell its just crank, con-rods, pistons...so you can re-use lifters if they are good, cam, (timing gear?), rocker assembly, heads, induction including plenum, and exhaust headers, and injectors - and accessories like serpentine belt assembly, air con etc etc.

So if my block is good what sort of costs are there in the parts for the 4.6 conversion? I know there are gasket kits and labour too of course. And while at it a set of new liners would be the go, and some gentle porting and polishing, and perhaps a new set of valves and a re-seat.

Has anyone considered going this route with a known good motor versus going a whole new long motor from say TRS and selling the 4.0 running in the vehicle to recoup some of the outlay...also what would you expect to get for a 4.0 in excellent condition at say 150-180k?

Has anyone gone larger injectors, bigger cam and better (and adjustable) engine management and if so to what extent? What sort of horsepower and torque can you get out of the 4.6 with such kit and some head work without going insane with it and keeping it drivable off road? I know there can be other drive train issues with too much hp and torque but I can deal with that separately.

Cheers

**justinc** · 9th October 2010, 06:26 PM

RELIABLE HP and Torque is cubes: a High compression 5.2l stroker with standard ancilliaries would possibly work out as a better option. Have to do the numbers but if you add up the engine management including Dyno time etc, plus other bits and bobs then the bigger capacity might just be a better and simpler option. The Motronic system is good with fuel trim and very reliable.
HOWEVER, A customer of mine has just had a 4.6 High comp short installed in his D2, can't rave about it enough

JC

**ozscott** · 9th October 2010, 06:53 PM

Thanks Justin. I love revving the 4.0 cause its just so sweet and responsive with the 5 speed manual, however I would trade some revs for stroke especially when towing the 2 tonn Vagabond. I have decided for the foreseeable future not to go to a new lease for a 4wd, so I am thinking of spending some cash on the 02 and the only area that is might do with some is under the bonnet.

There would be a BIG jump in stonk from 4.0 to 5.2 no doubt and an appreciable increase from 4.6 to 5.2. Do you know where to get such a kit?

Cheers

**justinc** · 9th October 2010, 07:07 PM

TRS do it, in Adelaide. (08)83846933 and ask for Phil. You will need to send your short motor as exchange.

Not cheap, BUT you get what you pay for. There is a fair bit of machining etc in this conversion.

They also do a 4.8 litre, But you'd have to run the numbers and work out for yourself whether you go 4.6 high comp, (Cheaper) or the whole hog high comp 5.2l in my opinion.

JC

**jakeslouw** · 10th October 2010, 10:14 PM

Now maybe a little difficult to do, but what about the Jeep 4.7HO V8?

Not a revver, but remove the catalytic converters and add a chip maybe good for 220kW?

**ozscott** · 11th October 2010, 07:14 AM

Thanks mate. If I was going a conversion I would put my money on an LS1 Chev motor because they are such a light, good thing, and plenty of bits here. However conversions are a bit of a pain and while the $$$ are dearer for a high output/hi torque rover at least its a bolt in.

Cheers

**101RRS** · 11th October 2010, 01:07 PM

TRS will sell you a second hand 4.6 for $3200.

Garry

**ozscott** · 11th October 2010, 02:54 PM

Thanks Gary - I have a very good and low mileage (167,000K) 4.0 that I have had from new and looked after very well - so I would not go second hand where I dont know the history. I would go new or reco 4.6 for sure if the money was right. There is no doubt Rover V8's in the larger sizes are more expensive (for no good reason apart from scarcity) than say a Chevy alloy counterpart.

Cheers

**101RRS** · 11th October 2010, 03:07 PM

Originally Posted by ozscott

Thanks Gary - I have a very good and low mileage (167,000K) 4.0 that I have had from new and looked after very well - so I would not go second hand where I dont know the history. I would go new or reco 4.6 for sure if the money was right. There is no doubt Rover V8's in the larger sizes are more expensive (for no good reason apart from scarcity) than say a Chevy alloy counterpart.

Cheers

I agree - likewise I would not go for a reco or "new" unless it has had top hat liners fitted. I might consider used if it had top hats.

Garry

**tempestv8** · 28th October 2010, 06:24 PM

If you were stroking a 4.0 to 4.6, it's probably worthwhile getting top hat sleeves fitted. That way you don't end up with a slipped liner, which is something that seems to happen more on 4.6 motors, for some reason.

Having said that, I had a 4.0 which did experience a slipped cylinder liner, and the engine wasn't even hot at the time it happened. Sigh!!

It cost me $8K to rebuild a 4.0 into a 4.6 with top hat liners.

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