3.5 V8 carbs - general information

fritz287 · Jan 5, 2014

Hi guys,

I'm about to buy a Range Rover with the famous 3.5 V8 carburators and I was searching on the web for more pratical information, which I could not really find in an "exhaustive" way - therefore I wanted to ask if you could kindly give me some

First of all, the car has got about 150.000km (about 90.000 miles) and is in good conditions, but maybe there are also things I did not notice... is there a particular kind of service to be made soon (at this mileage)?

If the engine runs normally, how is the oil consumption?

And how much fuel does it drink?

I know I'm not going to buy a hybrid Prius, and I won't use it for sure as a daily drive (also because fuel in Italy is 1.8/liter) but friends told me that it isn't actually that bad... by which I mean that it can also do someting like 60 miles with 3 gallons (15l/100km? I hate these units of measurement!)...?

Thank you very much in advance!

landowner · Jan 5, 2014

fritz287 said:
Hi guys,

I'm about to buy a Range Rover with the famous 3.5 V8 carburators and I was searching on the web for more pratical information, which I could not really find in an "exhaustive" way - therefore I wanted to ask if you could kindly give me some

First of all, the car has got about 150.000km (about 90.000 miles) and is in good conditions, but maybe there are also things I did not notice... is there a particular kind of service to be made soon (at this mileage)?

If the engine runs normally, how is the oil consumption?

And how much fuel does it drink? I know I'm not going to buy a hybrid Prius, and I won't use it for sure as a daily drive (also because fuel in Italy is 1.8/liter) but friends told me that it isn't actually that bad... by which I mean that it can also do someting like 60 miles with 3 gallons (15l/100km? I hate these units of measurement!)...?

Thank you very much in advance!

My 3.5 on carbs did 16mpg on a good day, mostly around 12

fritz287 · Jan 5, 2014

Well that's as dramatic as I expected it to be...

Thanks!

landowner · Jan 5, 2014

fritz287 said:
Well that's as dramatic as I expected it to be... Thanks!

It did have 4.6 heads and a cam in it but could never get more than 16, and 10 to 12 on gas. Even driven slowly and the carbs and timing were spot on, must have been the set up with bigger valves etc, didn't half go though

fritz287 · Jan 5, 2014

Here's another question: how much time does it take to regulate the carbs (it's something I don't have idea of how to do and that I'd ask a specialist for) and how much does it cost?

Thx!

landowner · Jan 5, 2014

fritz287 said:
Here's another question: how much time does it take to regulate the carbs (it's something I don't have idea of how to do and that I'd ask a specialist for) and how much does it cost?

Thx!

Do it yourself.
If you listen to the carb you can hear it sucking, get em both sucking the same by altering the throttle stop screws (disconnect the operating rod that works them both together)

The fuel screw goes in to richen and out to weaken, if you are making it better mixture wise the revs will rise
If you are making it worse (too rich or too lean ) then the revs will fall.

Adjust the mixture on both carbs so as you get the fastest idle then turn idle down on throttle stops making sure the carbs suck at the same rate by listening to them.

Same with timing, if you advance it and the revs rise then it was too retarded, if revs fall then it is going too advanced so go back

easy

fritz287 · Jan 5, 2014

Thank you very much!!

"Easy" is maybe a bit exaggerated, but I could at least try... What happens if the mixture is too rich or weak?

landowner · Jan 5, 2014

fritz287 said:
Thank you very much!! "Easy" is maybe a bit exaggerated, but I could at least try... What happens if the mixture is too rich or weak?

If it gets too rich while adjusting the idle will slow down and struggle
If it gets too weak while adjusting the engine will slow down and stop

blip the throttle every now and then to clear it out as you do it

Engine will speed up if its happy with the mixture (more efficient), try it then run it for a mile or two, switch off engine and coast to stop, remove a plug and check its colour, should be mid to dark grey for power, light grey for emissions but best for power

fritz287 · Jan 6, 2014

Ok so in case I will try to fix it, if it need some regulations... thank you very much again!

3.5 V8 carbs - general information

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