Hate to be the naysayer of the group but I am of the camp that believes it is not a necessity. Does it catch oil mist blow by yes, but what it also catches is unburnt fuel from the combustion chamber, specifically Cylinders 6 & 8 as well as possibly 1 & 3 .
By design Dodge Hemi Heads are the same part number regardless of whether it is mounted on the left bank or right bank of the engine. The air inlet and oil fill spout on the drivers side of block are the same air outlet on the passenger side of block. Both heads are open to the intake manifold runners of those cylinders only and not cylinders 5/6/2/4. They also open to the valve train at the top of the push rods.
When The injectors open fuel is sent into intake runner at the same time the intake valve opens and gas is sent to the combustion chamber The spark plug ignites the fuel and sends the piston down the cylinder bottom, the cylinder opposite then ignites its own fuel charge but also ignites the 2nd spark plug in the previous cylinder, however the first cylinder has begun to rise allowing unspent gas to exit through intake runner back into the intake.
Having 2 spark plugs for each cylinder 1 plug fires the initial charge the 2nd plug is fired by the 2nd cylinder charge but cannot contain all gas in cylinder before intake valve closes and exhaust valve opens. some goes back into intake and some exits exhaust. Cat 02 sensors
All our intake manifolds are divided into 2 separate compartments, not sure about the Hellcats though. 1 compartment is for the engine air exhaust to PCV valve but this is also the same open intake runner . the 2nd larger compartment is for fresh air intake.
Believe it or not The oil by pass and unspent gases are invisible when heated in the combustion chamber and become solid again when cooled. So even though you have a catch can the gases that have not cooled enough into droplets still travel into throttle body vacuum. Think of Humidity on a hot sunny day in a non air conditioned shop you cannot see it in the air but the cement floor is soaking wet looks like in rained indoors.
The purpose of the PCV is to direct those gases back to intake to be reburnt a second time rather than into atmosphere.
For those lucky Hellcat owners that have the PCV mounted on the valve covers a simple fix if not already done by FCA would be to place a thin metal shield below the PCV valve to redirect oil splash away from being sucked in or up. This was old school tech tips.
The best mod you could do to these cars is relocate your PCV to valve cover provided you have clearance from Valve train. which 5.7 & 6.1 do not and block off the Holes in the head and intake and current PCV locations. or install an electric air pump to vent the engine air like race engines do.
Pricey but are available for our engines. Look at any on line pictures of the 6.1 intake manifold underside with the belly pan removed and the heads intake openings the oblong slots cut into the parts between the above mentioned cylinders and runners and you will see the reason why you think you have a problem. A 2 Sport I think is the name makes a cast aluminum Valve cover with relocated PCV that fits the 5.7 because it is at the rear of the covers where the 6.1 is at the front of intake.
one other point I want to make is if you have a catch can on your car get a lighter and unscrew the can and ignite it before the gases all escape and see if it burns. Oil should not burn at ambient air temps. Oil wells only catch fire because of the gasses not the oil itself.
So in my opinion the catch can is a gimic because it prolongs the exchange of the gases there by allowing them to cool and turn back into liquid state. Move your catch can further away from throttle body and you will increase volume of liquid.
By design Dodge Hemi Heads are the same part number regardless of whether it is mounted on the left bank or right bank of the engine. The air inlet and oil fill spout on the drivers side of block are the same air outlet on the passenger side of block. Both heads are open to the intake manifold runners of those cylinders only and not cylinders 5/6/2/4. They also open to the valve train at the top of the push rods.
When The injectors open fuel is sent into intake runner at the same time the intake valve opens and gas is sent to the combustion chamber The spark plug ignites the fuel and sends the piston down the cylinder bottom, the cylinder opposite then ignites its own fuel charge but also ignites the 2nd spark plug in the previous cylinder, however the first cylinder has begun to rise allowing unspent gas to exit through intake runner back into the intake.
Having 2 spark plugs for each cylinder 1 plug fires the initial charge the 2nd plug is fired by the 2nd cylinder charge but cannot contain all gas in cylinder before intake valve closes and exhaust valve opens. some goes back into intake and some exits exhaust. Cat 02 sensors
All our intake manifolds are divided into 2 separate compartments, not sure about the Hellcats though. 1 compartment is for the engine air exhaust to PCV valve but this is also the same open intake runner . the 2nd larger compartment is for fresh air intake.
Believe it or not The oil by pass and unspent gases are invisible when heated in the combustion chamber and become solid again when cooled. So even though you have a catch can the gases that have not cooled enough into droplets still travel into throttle body vacuum. Think of Humidity on a hot sunny day in a non air conditioned shop you cannot see it in the air but the cement floor is soaking wet looks like in rained indoors.
The purpose of the PCV is to direct those gases back to intake to be reburnt a second time rather than into atmosphere.
For those lucky Hellcat owners that have the PCV mounted on the valve covers a simple fix if not already done by FCA would be to place a thin metal shield below the PCV valve to redirect oil splash away from being sucked in or up. This was old school tech tips.
The best mod you could do to these cars is relocate your PCV to valve cover provided you have clearance from Valve train. which 5.7 & 6.1 do not and block off the Holes in the head and intake and current PCV locations. or install an electric air pump to vent the engine air like race engines do.
Pricey but are available for our engines. Look at any on line pictures of the 6.1 intake manifold underside with the belly pan removed and the heads intake openings the oblong slots cut into the parts between the above mentioned cylinders and runners and you will see the reason why you think you have a problem. A 2 Sport I think is the name makes a cast aluminum Valve cover with relocated PCV that fits the 5.7 because it is at the rear of the covers where the 6.1 is at the front of intake.
one other point I want to make is if you have a catch can on your car get a lighter and unscrew the can and ignite it before the gases all escape and see if it burns. Oil should not burn at ambient air temps. Oil wells only catch fire because of the gasses not the oil itself.
So in my opinion the catch can is a gimic because it prolongs the exchange of the gases there by allowing them to cool and turn back into liquid state. Move your catch can further away from throttle body and you will increase volume of liquid.
