Best rover v8 setup for carbs?

[Automania]

Hi just wondering if anyone had opinions on the best lpg setup for a 4.6 on csrbs/carb. I've got the choice of a edelbrock carb with a sprintgas mixer which has the lifter plate for running on petrol, my other option is quad su carbs each with a mixer plate on them. I'm tempted by the su setup to be honest but wondering what others thought. Also how easy would it be to fit four mixers? I'm thinking vaporiser to a y piece and the same again from the resulting two pipes, or I could make some sort of manifold with four take offs? Any advice much appreciated

[rossko]

"Best" needs defining - cheapest, fastest, easiest to setup, flashest looking, easiest to live with?
Are you ever going to run on petrol - why use expensive/complicated carbs?

I do know a 4.6 that runs a standard twin SU/mixer okay. I shouldn't think it could ever develop max bhp at speed, but as its in a Landrover that don't matter at all - the low end grunt is fine.

[Gilbertd]

Setting up twin mixers is difficult enough, I would have thought setting up quad ones would be a real nightmare.

[Automania]

Best for the engine, I'm not after mega bhp but my thinking is that the restriction that could be possibly formed by the mixer on a twin carb setup is reduced by having double the avsilable airflow to start with? Or maybe it doesn't work like that?
It's going to be used off road so i don't really want the edelbrock, but saying that 99% of the time it'll be on lpg so the edelbrock angle problem won't be an issue

[rossko]

If you don't need bhp, you don't need to worry about restriction - see previous post.

If you're worried about restriction, you must go to an injection system. There is no way to run a mixer system without some restriction.

Multiple chokes make no odds to degree of restriction as such, but increase complexity. Improving engine breathing with multiple chokes (carbs) is one thing, but then you must give a bit back when introducing LPG mixers. You'd still end up with an improvement over standard arrangement, paying for it with added complexity.

A compromise could be a variable choke effort like a Blos.

[classicswede]

The 4 barrel would be a much better option in my opinion. 4 carbs would be a pain to setup and would have no advantage over the 4 barrel with single mixer.

The only issue would be is do you have the clearance for it?

[SimonHobson]

Well I never did manage to properly setup the twin carbs on the Disco When I got the 110, I decided to stick with a single mixer - so put a single mixer upstream of where the air intake from the filter spits to the two carbs. On the 110, it had a big single filter with a flexible hose to a steel tee pipe behind the carbs, and then the aluminium U bends. The upside is that you get an easy to setup system, the downside is there's a lot of gas/air mixture in the intake - I left the jubilee clips on the U-bends loose to allow them to blow off when I got a backfire (add a restraining wire to stop them falling out of the engine bay)