The V8 Owners Forum -

What is fuel system does Mr V8MGB man use when his running round tracks pulling 'x'G round bends overtaking Ferrari's?

I dont have any problems with my Ginetta and that has a bog flush 4 barrel 390 - there are no lulls - the fear inducing G whether A B or C is relentless - I am sure fear filled passengers would consider a flat spot a gift in my car

Do the eddybroke things have a powervalve? - have you tried stamping on the A pedal harder

Vacuum connections ! - is the wife expected to do something with the carb then?

Andrew

Thanks Chaps,
Some brilliant advice. From what has been said I think I need to see what I can do with floats, as float slosh seems to be the most likely cause.

I know that various devices are available for Holley carbs in order to improve them when used under high G. I've never seen similar stuff for sale for the Edelbrock Performer or Thunder series carbs. There is not much point in suggesting various fixes if they don't actually exist.

Someone on this forum and myself have tried blocking off the connecting channel between the float bowls (not the float valve channel). The mod did not make much, if any difference.

I find it both sad and odd that people recommend using the vac system when I suspect that they have not actually tried to get this carb to work with the Lucas dizzy. In total I have spent weeks carrying out various tests in order to get it work. The only way that it can be made to work in my opinion is to run a poor mechanical advance curve along with low static and all in timing figures. (Something like the poor figures that Rover specify might work in terms of no kickback, if the kickback is indeed timing related but the overall performance and possibly the MPG will be worse).

Life is compromise, with this setup the best compromise is to ditch the vac system and run a decent static and all in curve. The mechanical curve should be all in around 2700-3000 RPM. (i.e the start of the torque 'plateau ' of most road spec RV8 lumps)

In my humble the Eddy carb is a good road carb built to a price, it ain't a fully blown racing carb, it can be made to work well when calibrated correctly but it will misbehave if the car can pull high G under braking or whilst cornering. If it's calibrated as per RPI settings for example you will have no hope of getting it to run well.

The Eddy performer manifold will tip the carb forward 5 degrees if the engine is mounted level in the car, this will also cause an issue under braking. I guess they were expecting the engine to be tipped back 5 degrees. If your engine is tipped back more then 5 degrees your carb will also be tipped back. This will lean out the carb especially on the transition circuit which is the one circuit that is not easy to adjust. I guess a lambda probe would help here as you would at least know whether the bog is lean or rich.

I am of course assuming that you have the Performer manifold!

I believe that the holleys are better than edelbrocks wrt to slosh. Although I do seem to recall that the guys with Ultima GTR's would get "stalling under hard braking" - which i think was also down to slosh and they tend to use holleys. (ask over on the ult forum on PH)

Eliot wrote:I believe that the holleys are better than edelbrocks wrt to slosh. Although I do seem to recall that the guys with Ultima GTR's would get "stalling under hard braking" - which i think was also down to slosh and they tend to use holleys. (ask over on the ult forum on PH)

Hi Eliot, I don't know much about Holleys but I believe that there are many different types, some are no better than the Eddy carb but other's I suspect are 'racing' carbs and can therefore be tuned to work well under extreme conditions.