Conversion, has anyone done it?

A 4litre IS a 3.9. both or 3950cc, so all things being equal they will have the same torque. Of course 4 litre has a better bottom end, and better oil pump but power wise its the same.
The 4 litre name came about apparently because Jeep introd the 4litre in UK and Land Rover felt theirs had to be as big.
There are cheaper things to get more torque. I have fitted a Thor manifold on my 3.9 and along with a few other mods such as self modded heads,and unichip it makes 50% more torque at low revs.

BUT it is experimental, and you have to fab brackets etc for kickdown.

4.6 are a bit of a worry but there are people around now who put flanged sleeves in them which apparently overcomes the porosity problems, or more correctly sidesteps them.
Friend of mine has had Bruce Davis build a 5litre out of a 3.9. he is quite happy at the moment, after a few probs with inappropriate cam selction.
regard s Philip A

https://www.aulro.com/afvb/images/im...007/12/352.jpg

Now that I've got your attention.

1UZFE VVTI, 6bolt mains (std), 4 lt, all alloy quad cam,
cam specs
intake 321deg @ base
exhasut 319deg @ base

104deg intake lobe separation
105deg exhaust lobe separation

257deg @ 50thou

408thouh lift from base

165thou intake lift at TDC
145thou exhaust lift at TDC

VVTI mechanism custom modified to suit cams

4 x nissan RB26 twin inlet throttle bodies atop custom 3dcnc alloy adaptor, 45mm bored to 48mm with shafts milled down to 6mm (equivalent to 45mm with no butterfly or shafts)

Custom Argo rods with Custom pistons from specialized piston services in melbourne (short skirted, oversized pins, modified rings/grove heights)

Aforementioned heating issues are not ecu related, he's plumbed something wrong, I've never seen a heating issue (incl twin turbo and s/c and turbo - s/c conversions). Engines are cheap (non vvti cheaper and simpler). Iron block is a 2UZ, 4.7 is 3UZ (but very expensive). Anyone who says they don't have torque needs a 6 foot mirror, some viagra eyedrops and take a good hard look at themselves.

Im not sure thats the greatest engine for a rover but then I like a tractor engine more than a race engine...

no denying that engine makes a bootload of torque but its where it makes it that is the problem IMHO the max torque is way to high in the revband. I like the lazy feeling that a torque curve that starts somewhere near idle and is done and dusted by 2000ish RPM..

Quote:

---

Originally Posted by blitz

I like the idea of the diesel cummins or chev but the extra weight I think would make the cars balance to front heavy.

Blythe :confused:

---

Isuzu. Same configuration as the cummins, but turbo and intake are on different sides which works very nicely for a RHD rover.
With a 4BD1T in a rangie, the axle weights are damn near even. I've got 1130kg front, 1170kg rear.

JustinC's got a similar setup.

Quote:

---

Originally Posted by strange_rover1

Great to have so many replies soo quickly, also don't worry Andy I havent deserted the LR team, just looking at different alternatives as the old 3.5 is on its way out I think. Justin I was gunna get a half cut Soarer or Crown so wouldn't have a LC gearbox and I would be pretty certain that using the Soarer or Crown box would be out of the question?? Hmmm decisions decisions????:confused:
Shano

---

A large rover motor (4.6) would be better, cheaper and easier.

Toyo cams are extremely conservative, in their engine designation system, a 1UZ-FE is; first gen, UZ series, FE head design. (designed for fuel economy) GE heads are the performance heads (like the famous 4AGE engine).

https://www.aulro.com/afvb/images/im...007/12/350.jpg

Check original profile vs the weld/grind. 320deg + is probably a bit over the top for off road but you can move the torque around quite a bit. Get a vvti model and a autronic (our plan) or motec with vvti control and you're set. We're looking at pulling torque down to around 2200 to 2500 up. Red line at 9000 to 9500

Matt and i know a bloke who has a Lexus V8 in a Toyo Middy, its a Beast.... But the engines dont like to punnished...... they die....

YouTube - Team Cockpit Datsun Recovery Vehicle

Quote:

---

Originally Posted by sclarke

Matt and i know a bloke who has a Lexus V8 in a Toyo Middy, its a Beast.... But the engines dont like to punnished...... they die....

---

Wouldn't say that, the motor was of an unknown quantity when he put it in, only span bearings, being jap import, probably NEVER has an oil change

Hmmm looks like I have started an interesting thread here. I had originally looked at the 4.6 but found they were hard to come by and the ones that were available were outrageously priced. The Lexus quad could be purchased in a front cut set up for around the $2000 mark. Even the imported 3.9s were up around the 4-5k mark.
Shano

A front cut for your purposes will be over the top. You'll spend a lot of time stripping (esp wiring) and finding people to buy the left overs. (There is a market) but you could make some of your money back. Advantage, you can get to hear the motor running (yes they'll hook it up to a battery and drum of fuel, if it's front wheel drive go for a spin :eek:) Disadvantages: leftovers, cost.

Engine, harness and computer could be had for 1000 to 1500. Disadvantages, may not include all extras (alternator, not an issue, adapt rover, keep power wiring original. Power steer pump, same, keep hoses original. But then again they may not be in the same location anyway).

Engine/harness only, 800 to 1200. Advantage, aftermarket comp, tune for power/cams/economy. Disadvantage, may have even less extras.

These are for the simple non variable valve timing (VVTi) engines, VVTi add 500-800. Aftermarket comp for VVTI = autronic or motec M8 = danger to the bank balance.

There are 2 or 3 different sump configurations, theres crown, soarer, landcruiser (never seen one) models. The sump is still pretty high, for instance, in the pics I first posted, the sump is 4mm off the crossmember, and the cam covers highest point is 28mm above the top of the tyre (18" wheels with dunlop porsche cup slicks), suspension adjusted to 1/3rd down from highest setting.

My interest in this all is:

1; original vehicle was 69 series 2, restored over 3 years from age 14 up.
2; second vehicle was 82 rangie, carb 3.5 (sold 5 years ago) since been building the supra have been thinking of building a on road only (2wd) rangie with 1UZ and r154 (5sp) or V160 (6 sp) box (no tfr) as a tow car for the supra
3; friend visited land vehicle spares at silverdale on the weekend and found the sold rangie sitting there, mostly complete. Not surprising since just after I sold it I got a council notice to remove it from the dtreet somewhere.
4; may buy a 130 crewcab with dead engine and do conversion.