What do valve cover vents do?
The thought behind the breather is that you are supposed to get more fresh air flow down into the crankcase from the valve cover. This increases the cycle of oil vapor flow out of the crankcase. The added fresh air displaces the oil vapors in the crankcase with the assistance from the IM vacuum sucking it out.
What kind of hose does a fuel pump need?
Here’s what they say. The red highlighting is mine. (a) Each hose used between the fuel pump and the carburetor must be “USCG Type A1” hose. If a hose is used in the fuel line running between the fuel pump and the carburetor, the hose must be “USCG Type A1” and so labeled as required by 183.540.
How does valve cover breather work in engine?
When attached to the intake, the breather hose actually generates more pressure gradient to push fresh air down into the crankcase via the valve cover breather from the intake at higher engine speeds! When you use only 1 breather in an open system, not enough fresh air coming through the breather filter gets down to the crankcase.
What should I use to keep my fuel pump in place?
Usually a clear vinyl hose is used. That way if you see fuel in it, you know that the pump is leaking. When you install the hose, the actuator rod needs to be held up. You can use grease to hold it in place. I made a tool out of a piece of metal strapping; the kind that holds things in place on pallets.
Why does the valve cover turn into a vent?
At higher speeds/loads both openings turn into vents because the crankcase pressure due to blowby flow has become so much greater. Whether the valve cover opening is connected back to the intake tube or has a filter doesn’t really make much difference.
Here’s what they say. The red highlighting is mine. (a) Each hose used between the fuel pump and the carburetor must be “USCG Type A1” hose. If a hose is used in the fuel line running between the fuel pump and the carburetor, the hose must be “USCG Type A1” and so labeled as required by 183.540.
Can a vacuum pump be connected to a valve cover?
The pump can be either electric or mechanically driven, but for an ideal solution should be connected to both the block and the valve cover to pull vacuum from both areas efficiently. One must be cautious to select the proper size pump so that you are pulling the right amount of vacuum.
What can I use to evacuate the crankcase and valve cover?
Belt or Electric Vacuum Pump Another option is to evacuate the crankcase and valve cover by pulling a negative pressure on it. This is done using a vacuum pump. The pump can be either electric or mechanically driven, but for an ideal solution should be connected to both the block and the valve cover to pull vacuum from both areas efficiently.
Usually a clear vinyl hose is used. That way if you see fuel in it, you know that the pump is leaking. When you install the hose, the actuator rod needs to be held up. You can use grease to hold it in place. I made a tool out of a piece of metal strapping; the kind that holds things in place on pallets.