4.6L engine Specs

[Mudrat]

G'day everyone, i've recently become the new owner of an 85 4 door range rover. The vehicle, was just fitted with a brand new 4.6L engine. and my question is, what are the basic specs ie horsepower and kw's etc of this engine assuming that no mods etc have been done. Also, then what are some basic mods that i can do etc to gain more power. The engine is fitted to the 3 speed auto g.box, and was wondering if this was a good pairing or should i be looking at going to a ZF auto setup or even a manual g.box.

Cheers

[Loanrangie]

With the gearing of the t/flite and the extra power you now have , it should hum along nicely. What fueling does it have efi or carby ?

[Mudrat]

Its currently running a carby setup, the old school twin style. Whatever they are called. LOL. Would adding a holly of some sort improve performance or am i wasting my time, as i have sitting in the shed all the parts to replace with a holly setup.

[ISUZUROVER]

Its currently running a carby setup, the old school twin style. Whatever they are called. LOL. Would adding a holly of some sort improve performance or am i wasting my time, as i have sitting in the shed all the parts to replace with a holly setup.

The factory 4.6 specs are available lots of places - just do a search on google. HOWEVER - you will probably have 10-30% less power and torque than the standard figures because you have a carby, not the stock EFI setup.

DO NOT FIT A HOLLEY - they are the worst carby on hills. If you only drive flat ground then a holly will be fine but if you actuallly use it offroad it is a PITA (there are ways to fix the problems with holleys offroad but it is not worth it IMHO). The stock RR CD's are one of the best offroad carbys.

[HSV Rangie]

dont fit a hlolley, crap off road.

If you want to change fit a quadrajet. great carb.

Michael.

[Mudrat]

I was un aware, about the holly's performance. I'd always thought that they were good. After hearing that, i'll be steering well away. I'd say then for now, thet standard setup will be used. Is there alot involved in converting to efi and basically is it worth it? I'd rather spent dollars on suspension mods etc, then simply gain just a little bit of power. Speaking of suspension - what is everyone's opinion on lifted TJM springs, the dealer here in town seems to be selling them at reasonable prices, or am i better to go to my local spring shop and get some custom coils by them or simply another brand. I'll be trying to achieve a 2 inch lift at this stage in the game.

[HSV Rangie]

Suspension:

what size tyres:
what do you want to achieve.


The best range of springs are fromRangie Spares.
Lok in FAQ there is a guide to springs and aproz ride hights.

I would use springs from RSpares also available from others.
Bilstien or Koni shocks.

Regards
Michael.

[fridgefreezer]

Don't fanny round with carbs, fit fuel injection. Even the setup from a 3.5 will cope better than carbs. Drop the lucas ECU and go MegaSquirt for the ideal setup.

Anorak fact: The 3.5 injectors are the same as the 4.6 ones, just run at lower pressure. Fit a 4.6 FP regulator and tune it right with MS and you'll make way more power than any carb setup.

Power figures for all Rover V8 engines are here: http://www.austin-rover.co.uk/index.htm?engineroverv8f.htm, notice how much lower the carbed engines are

[Loanrangie]

I've had no problems with my 3.5 and 350 holley but for a 4.6 i would either go with a quadrajet or as fridge freezer suggests go for efi with a Megasquirt ecu, would end up costing a similar amount but the efi would be my choice- i am about to do an efi + Megasquirt conversion to my 85' 3.5.

[Mudrat]

Thanks everyone for that input. I'll do a bit of research on the fuel injection possibility. Im currently looking at the specs for springs and basically want a 2 inch lift, due to the recent fitment of 31" tyres on ofset rims. Ideally, i want the suspension to flex reasonably well offraod, but still have desirable manners on-road. What does everyone think about removing the sway bars, which are currently fitted front and back.

[Loanrangie]

Junk those sway bars, they are not factory fitted, if you want to reduce the body roll, get some polyairs. I think the common response around here would be to get springs of similar poundage to stock except longer to give the required lift, too stiff and you will lose flex.