4.0 vs 4.6

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Discussion

agent006

Original Poster:

12,058 posts

269 months

Saturday 24th June 2006
quotequote all
I'm on the way to buying a V8 P38 rangey of some sort. All this talk of 4.6 engines being made of tinfoil and chewing gum has got me a bit confused. Is it an inherently bad engine, or is it a good engine that just needs to be maintained perfectly? Opinion seems to be divided pretty much 50/50 from what i've read.

Otherwise phrased as "I really don't want a 4.0 as a 4.6 is barely fast enough but i don't want it to fall to bits, shat should i do".

Anyone mentioning the D word can go and sit in the naughty corner.

Liszt

4,330 posts

275 months

Saturday 24th June 2006
quotequote all
They can both suffer from pourous blocks and slipped liners.
Go for a 4.6.

gep

459 posts

221 months

Saturday 24th June 2006
quotequote all
agent006 said:
I'm on the way to buying a V8 P38 rangey of some sort. All this talk of 4.6 engines being made of tinfoil and chewing gum has got me a bit confused. Is it an inherently bad engine, or is it a good engine that just needs to be maintained perfectly? Opinion seems to be divided pretty much 50/50 from what i've read.


4.0 & 4.6 have the same blocks!

I used to have a 4.0, it was ok but i'd go for my 4.6 any day

Keep the coolant system in perfect order and you wont suffer a slipped liner. After buying my 4.6 i immediately replaced the rad, stat, hoses & coolant as a precation. I learnt the hard way, my 4.0 had a slipped liner because of a clogged rad on 115k

GKP

15,099 posts

246 months

Saturday 24th June 2006
quotequote all
gep said:
Keep the coolant system in perfect order and you wont suffer a slipped liner. After buying my 4.6 i immediately replaced the rad, stat, hoses & coolant as a precation.



agent006

Original Poster:

12,058 posts

269 months

Saturday 24th June 2006
quotequote all
How much roughtly did that work cost? I would assume the thick end of £700, but i'm used to Audi prices.

Triple7

4,015 posts

242 months

Saturday 24th June 2006
quotequote all
They are old Rover V8's, some say one of the best in the world. They went in all sorts of cars including TVR's. Errr maybe that is not a good indicator!

4.6 is more desirable, so just look after tham and check that coolant! (And make sure everything works, the heated seats break all the time, may be a tad difficult to test when it is 25c!

G

gep

459 posts

221 months

Sunday 25th June 2006
quotequote all
agent006 said:
How much roughtly did that work cost? I would assume the thick end of £700, but i'm used to Audi prices.


I ordered the parts on the net (www.paddockspares.com ) and my mechanic fitted them, came to just under £400. Could have done the work myself to be honest, didnt look too complex. Check the water pump & fan while you're at it

Avoid stealers like the plague

Edited by gep on Sunday 25th June 13:27

agent006

Original Poster:

12,058 posts

269 months

Sunday 2nd July 2006
quotequote all
Test drove a 4.6 on Friday. Well that's the 4.0 off the list then, even the 4.6 feels underpowered (hate to think what the diesels' like).

_deejay_

4,954 posts

259 months

Sunday 2nd July 2006
quotequote all
agent006 said:
Test drove a 4.6 on Friday. Well that's the 4.0 off the list then, even the 4.6 feels underpowered (hate to think what the diesels' like).


You really don't want to know. The standard diesel really did feel unusable.
I wouldn't relish getting up to speed on a motorway slip road, that's for sure!

They're reputed to be much better after a remap though (similar to a 4.0 apparently)

D

agent006

Original Poster:

12,058 posts

269 months

Sunday 2nd July 2006
quotequote all
The drive train feels like it needs 250+bhp. With a manual box the 4.6 would be better i think.
Felt much bigger than i thought it would (although easy to judge with the squqare bonnet), and you really feel the weight at low speeds. Cruising and cornering at 40+ feels like anything else i've driven of that type, not as scary as i imagined it might be. Huge throttle travel makes cruising easy, managed 16mpg on the test drive doing a bit of town and then quick a roads, which i expected to get closer to 10.

I'm pretty much sold on it now, just need to find one in my pricerange.

_deejay_

4,954 posts

259 months

Sunday 2nd July 2006
quotequote all
agent006 said:
The drive train feels like it needs 250+bhp. With a manual box the 4.6 would be better i think.
Felt much bigger than i thought it would (although easy to judge with the squqare bonnet), and you really feel the weight at low speeds. Cruising and cornering at 40+ feels like anything else i've driven of that type, not as scary as i imagined it might be. Huge throttle travel makes cruising easy, managed 16mpg on the test drive doing a bit of town and then quick a roads, which i expected to get closer to 10.

I'm pretty much sold on it now, just need to find one in my pricerange.


I'm getting to like ours - I take it instead of the Alfa 147 9 times out of 10.
I'd find 16mpg quite hard to stomach though - ours is doing 20-21 @ 39.9p/litre which works out pretty well.

As you say, low speed driving isn't great but 50-90mph is pretty respectable.

D

GKP

15,099 posts

246 months

Sunday 2nd July 2006
quotequote all
I've just changed the cats and lambda probes on mine. It's made a huge difference to mpg (on unleaded, not lpg/potato oil etc!). From low/midish teens to low 20's instantly.

eliot

11,682 posts

259 months

Sunday 2nd July 2006
quotequote all
GKP said:
gep said:
Keep the coolant system in perfect order and you wont suffer a slipped liner. After buying my 4.6 i immediately replaced the rad, stat, hoses & coolant as a precation.





To clarify, do you see high temps on the dashboard temp gauge or are we talking of just a few degrees higher is enough to damage the blocks? I.e. if it climbs over half way, get the rad changed etc.