Idle dribblers on a K valve system

Has anyone a schematic or able to provide a description of how a dribbler system is plumbed. This will be for blown alcohol on a 540 BBC, Hi-Helix 14-71 Kobelco blower with Delta opening. Inlet manifold has provision for two nozzles per cylinder. Thanks in advance for any help you can provide.

Alan

 

WHy do you need a dribbler system. Your setup is pretty similar to a lot of racers?

 

Not necessarily going to run dribblers. Just like to have the option available. I also like to understand how things work so a plumbing schematic is step one towards considering things. It is unlikely I will start with them but you never know until you look. Thanks for the responses so far.

Alan

 

Can do it several ways. Use the schematic and run two lines to each port from port distribution block(s). Picture of the distribution block is an all in one Gorr. You can use two 8 ports too.

 

Thanks for that, but surely plumbing it that way would not have the nozzles active at idle as they would still be controlled by the port check and sufficient BV opening.

 

That’s why I included the picture of the Gorr block. It’s actually three circuits: one for idle with no check, one for dribblers with a low pound/rpm just off idle check and one with a higher pound/rpm check for above off idle. Real numbers are five pounds for the off idle/dribbler circuit and twenty five pounds main for the Gorr block. That again is one way to do it. You could put some of the idle circuit in both the hat and ports or just the hat. PSI recommendations for a screw have three circuits with three sets of checks and two open ports for the idle above the rotors. All depends on what you want to do.

 

I just drilled and tapped my hat block for the extra lines and ran them to the port dribbler nozzles.

 

I guess I missed something. I don't see a need or a benefit in a separate idle dribbler nozzle system when the BV has an idle circuit in it already. I see how it would work but don't see a need to have the extra nozzles. After all, how much time do you spend at idle?

 

And so what if the EGTs are not the same at idle, Stage EGT yes, idles, NO. Just sounds like a more complicated fuel delivery system than needed. Maybe it is just me.

 

In my application the front cylinders, especially #2 were very fat at idle to the point of going out, if I leaned the BV enough to prevent this the rear cylinders would get very hot 900-1000° at idle. Adding dribblers to the rear cylinders feeding off the hat block cooled them down allowing me to lean the BV and keep the front cylinders from going too fat.

I guess moving the blower back would help or cure that issue also, but my wide open fuel/air distribution is pretty much spot on. Plus it was less expensive to add the dribblers.

 

Will, I idle at 21-2200 in neutral, idle check 10#, port 26#. Keep in mind I don't have a flow meter, so I have separate lines from the K valve to the hat block and port block.

 

Great information people, thanks to everyone. Now I have a mental of picture of how it goes together should it be needed. Will in particular for that insight into dealing with idle distribution by raising check pressure. Thank you vry much.