Carb upgrades for Rover V8's

[sclarke]

Guys,
This will cause some argument, but i want everyones opinion please... with justification....

Ive got a county with an auto and a Wover V8, its a 3.5ish

was a 3.5, now mildly lumpy and goes well with the CD175 stombergs and LPG mixer rings.... BUT..... like all.... i want more....

I have in my junk collection a 2 barrel rover manifold that suits a holley carb... i have some 1.75" SU's from a Rover, i have some 2" SU's from a Jag 4 litre and some more Stromberg carbs laying around...

Happy to buy a 4 barrel and manifold to suit.....

But should i machine out my manifold and fit the 2" SU's??? go the Holley, keep the CD175's? fit a edelbrock???

The county is not a road car, its a toy, winching and steep inclines is a normal life for it.... so i need never to have a run out of fuel problem....

Ohh i only use LPG to get to and from my destinations..... i like HP....

Clarkie

[bee utey]

Holleys don't like steep slopes. Gas doesn't care. I would look at a 2 or 4 barrell Holley for road use, topped with a New Gen mixer. The New Gen opens up in petrol mode so you get A1 highway performance. In the really rough stuff run gas for good low down torque and stability in the steep bits.
Just my opinion:)

[Bigbjorn]

Edelbrock dual plane and a Rochester Quadrajet. There is simply no other choice that works so well and is such an easy changeover.

[PhilipA]

Just a historical footnote.
When they first were testing the RRC they tested them with 2 inch SUs and achived better power but apparently lost torque at lower revs so reverted to the 175CDs.
That is one recollection. The other is that SU couldn't supply the quantity of carbys needed anyway and that is why they initially went Strombergs.

Later the SUs would not pass emissions.

No experience with Rochester, but sounds good. My experience with Holley has not been positive.
Regard sPhilip A

[justinc]

HIF-6 SU, ex P6B V8 etc are the bees knees. Easily tuneable, excellent torque down low, and will flow easily enough.

JC

[incisor]

thats what i have..

and the difference between mine and a vehicle with standard carbies is duly noticeable...

[CSK]

Has anyone ever had any experience with the 'Boxer' manifold featuring 4 SUs?

[clubagreenie]

I have seen a cross over manifold with 4 x DCOE Webbers positioned over the rocker cover feeding the opposite bank of cylinders. Chewed fuel but went like a greased stack of **** and sounded great. On a RRC and needed to cut the dip in the bonnet out and invert and reverse it and used as an intake.

[Col.Coleman]

thats what i have..

and the difference between mine and a vehicle with standard carbies is duly noticeable...

I know where they are going when the suzi goes in then:D

CC

[lokka]

I modded a 2 bbl holly so it would run at all angles all that needs to be done is block the original bowl vent with a 1/4 set screw and re drill the vent in the middle of the fuel bowl and fit a breather hose that runs back to the ventri via a small coiled hose it worked a treat for me and was easy to tuen and would give great economy if drove right on pulp or the 95 ron stuff .

As for LPG id use a 300A mixer on the snorkel attachment to fit the holly or is you went the quadrajet way like brian mentioned use the same 300A set up .

[Homestar]

Hi, a carby & manifold change are high on my list as well, just a couple of questions: - If using the Quaddie, do the jets need to be changed? I did this conversion on a holden 253 many years ago, and dropped the jet sizes a bit to get the best out of it. - Does anybody have a manifold/carbie for sale that would suit this conversion? Also, if I go down the HIF-6 SU path, can anybody advise on where to get one of these from - I haven't come accross these before. Lastly, does anyone have an opinion on a camshaft that would suit this configuration to get a bit more from it - nothing extreme, I still need it to be driveable.

Cheers.

[Bigbjorn]

Hi, a carby & manifold change are high on my list as well, just a couple of questions: - If using the Quaddie, do the jets need to be changed? I did this conversion on a holden 253 many years ago, and dropped the jet sizes a bit to get the best out of it. - Does anybody have a manifold/carbie for sale that would suit this conversion? Also, if I go down the HIF-6 SU path, can anybody advise on where to get one of these from - I haven't come accross these before. Lastly, does anyone have an opinion on a camshaft that would suit this configuration to get a bit more from it - nothing extreme, I still need it to be driveable.

Cheers.

I have fitted Quadrajets ex Holden V8's to Valiant 265's amd one Range Rover without any changes whatsoever and they just started up and ran OK. Just had to adjust the idle mixtures, and later, fiddle with the opening of the vacuum secondaries to suit personal requirements of the owners. I have fitted them twice to red Holdens with an adaptor plate that blocked off the secondary throttles. Same result. I suppose you could use an exhaust analyser and change jets if required.

[Hobbes]

Hi Clarkie,
If your budget will stretch to it a new Weber/Edelbrock 500 is a good bet. RPI in the UK have the full kit with linkages and manifold for 850 quid. It doesn't have the starvation issues at high angles that the old Holleys did.
Years ago I fitted a Carter 400cfm to my old 82 classic - It went well but I never managed to get it set up and jetted correctly (4 barrels a black art in the UK) Fuel consumption around 8 mpg or 30l/100km.....!

[incisor]

Also, if I go down the HIF-6 SU path, can anybody advise on where to get one of these from - I haven't come accross these before.

you need two...

http://www.aulro.com/afvb/attachment.php?attachmentid=27902&d=1282104937

they show up on ebay regularly

they bolt on where the strombergs did and you have to modify a couple of things but not a lot.

you also need to fit a fuel pressure regulator as the su's dont like to much pressure on the fuel inlet side.

[Homestar]

Thanks Incisor - you'll have to forgive my ignorance, I have been away from 4WD for a long time, and am a newby to Range Rovers. Motor bikes have been more my thing for a long time before this came along, now I'm hooked.

This looks like an easier conversion as well, as the manifold can stay put.

Cheers. :)

[SPROVER]

Ive got one of those manifolds in the shed.Been there for years.It came off an old SD1 V8 Rover.You can have it for a 12 pack of corona beers.:D:D
Cheers
Chris