Outer Limits 4x4 Board

Rangie has a holley 2 barrel on it. There's a pipe out the frount of the carby body, has a hose attached that is blocked with a bolt. Not sure what it's for I'm new to the world of carbs. Any tips?

what is the diameter of the hole

3-4mm inner diameter. Extends about 20mm.

Sounds like to one that goes to the vacuum advance on the dizzy. Mine has one on the RHS of the carb that has a 90 degree bend in it this is about this size and goes to the dizzy.

Thonga,
If you want to know some more about the carb, look at the choke air-horn and there will be something like "LIST-nnnn" or just "R-nnnn". This is the Holley model designation. If you have a generic 350/500 cfm two barrell, the aircleaner mount should be a standard 5 1/4 inch diameter.
If the tube runs from halfway along the baseplate and is about 5/16 or 3/8, that's for PCV connection. If you have a generic 2Bbl it should have what looks like a 1/2 inch thick block sandwiched between the bowl and body. There should be a steel tube poking out one side. That's a vacuum advance. If yours has both that one and an angled pipe, the angled pipe is either for EGR stuff or spark port vacuum advance.
You should have (generic again) two small slotted screws on either side of the 1/2 inch sandwiched block. They are your idle adjusters.
Lastly, if you ever have a big backfire it can damage your power valve.
Any speedshop can supply Holley parts, rebuild kits etc etc.


Enjoy
Rabidweevil

Thonger,
The two slotted screws control the Idle mixture. The idle adjustment is down near the throttle shaft, about a 6mm diameter slotted screw.
You can check float level whilst the car is running by undoing the sight plug screw, located about 3/4 up the bowl. Fuel should be just at the level of the botton of the threads.

Hands typing before brain fully engaged......


Regards
Rabidweevil

Thonger,
The two slotted screws control the Idle mixture. The idle adjustment is down near the throttle shaft, about a 6mm diameter slotted screw.
You can check float level whilst the car is running by undoing the sight plug screw, located about 3/4 up the bowl. Fuel should be just at the level of the botton of the threads.

Hands typing before brain fully engaged......


Regards
Rabidweevil

RabidWeevil wrote:Thonga,
If you want to know some more about the carb, look at the choke air-horn and there will be something like "LIST-nnnn" or just "R-nnnn". This is the Holley model designation. If you have a generic 350/500 cfm two barrell, the aircleaner mount should be a standard 5 1/4 inch diameter.
If the tube runs from halfway along the baseplate and is about 5/16 or 3/8, that's for PCV connection. If you have a generic 2Bbl it should have what looks like a 1/2 inch thick block sandwiched between the bowl and body. There should be a steel tube poking out one side. That's a vacuum advance. If yours has both that one and an angled pipe, the angled pipe is either for EGR stuff or spark port vacuum advance.
You should have (generic again) two small slotted screws on either side of the 1/2 inch sandwiched block. They are your idle adjusters.
Lastly, if you ever have a big backfire it can damage your power valve.
Any speedshop can supply Holley parts, rebuild kits etc etc.


Enjoy
Rabidweevil

Ok sounds stupid but... PVC means what and EGR means????
the 90 degree pipe in pick is linked to the dizzy, the other pipe is the bloked one on the frount, not sure if it should be hooked up to something to pass RWC. Both pipes are out of veiw in this pick but hope it gives an idea

Thonger,
Sorry. PCV = Positive Crankcase Ventiliation, EGR - Exhaust Gas Recirculation.

The PCV valve generally is in one end of the rocker covers, and usually connected by a large-ish diameter hose to a similar takeoff in the carby baseplate, or spacer if used. If you pull the PCV valve out and shake it, it rattles and when the car is running, manifold vacuum draws crancase/head gases back to the inlet manifold.

EGR is an emissions control and usually involves venting some exhaust gases back to the manifold via a vacuum operated valve located somewhere on the manifold.

Back to your piccie. Check to see whether there is a large diameter pipe under the fuel bowl. That is generally where the PCV hose runs to. The other pipe you've indicated (only one there?) is a full time vacuum source for either PCV or to your charcoal canister if you've got emissions control.

What you can do if you have the canister is run some hose from it to the canister but block it off with a ball bearing. Otherwise just leave it as is after checking the hose isn't cracked.

Hope this helps.

Regards
Rabidweevil.