4.6 V8 Carbs - Help Needed

4646464646 · Post by **4646464646** » Mon Mar 19, 2007 6:57 pm

Hi all,

Just put a 4.6 V8 in a Comp Safari racer but not sure what to do with the Carb side. We put 2 SU's on it from a 3.5 SD1 and it ran really very badly! No go at all.

What needs to be done to the Carbs to make it run with a 4.6 V8?

How do you set them up?

What other options are there?

Cheers!

chodjinn · Post by **chodjinn** » Mon Mar 19, 2007 8:19 pm

probably best bet with carbs is get a Wever 500 and have it jetted for the 4.6. The SUs you put on will njot supply enough fuel - they were off a 3.5 after all - so would need rejetting at the least.

4646464646 · Post by **4646464646** » Mon Mar 19, 2007 8:23 pm

From a financial point of view i'm thinking it would be a lot cheaper to referb the SU's and not be spending £500 on a Weber.

What would I need to do the the Carbs? New needles? If so, how do i match them to the engine?

Cheers

Eliot · Post by **Eliot** » Mon Mar 19, 2007 10:50 pm

weber 500 might be a bit of nightmare on a comp safari motor. My dakar used to cough and stumble just pulling into my road.

Theres some info on mods for the SU manifold on a 4.6 described here:
http://www.mez.co.uk/TuningTheRoverV8-pt6.html

Eliot.

4646464646 · Post by **4646464646** » Mon Mar 19, 2007 11:42 pm

Good site. Very usefull information.

Cheers!

minorv8 · Post by **minorv8** » Tue Mar 20, 2007 3:15 pm

I have run both SU´s and Weber (Edelbrock 500) carb on my 4,6 and SU´s area really restricting the engine. They are only used for MoT visits. I don´t remember which needles I have but I can check. I think they were BCA´s.

EDIT: They are BCA needles.