Back Cut Exhaust Valve at Hunter Berry blog

Back Cut Exhaust Valve. Corresponding exhaust valve has a thicker margin to resist higher temperatures and a generous radius on the bottom to encourage exit flow around the valve. Back cutting a valve increases flow at certain relatively low lifts because of the geometry. Usually steel valves like a 12* back angle have more reverse flow than a ti valve with a 25* back angle and back cutting the 12* makes. Otherwise it can be used. Intake valve (left) has a 30° back cut above the seat and a thin margin with a sharp edge on the bottom to discourage inlet tract reversion. I think this is pretty universally the case in vast. The exhaust valve has to withstand much higher temperatures than the intake valves so they are usually made of a stronger high temperature alloy. After the valves have been lapped, a backcut is placed on the back of the valve, close up to the inner edge of the 45° seating area.

Exhaust Cut out Valve Muffler Valve Exhaust System with Remote Control
from cnltxsq.en.made-in-china.com

Otherwise it can be used. I think this is pretty universally the case in vast. Intake valve (left) has a 30° back cut above the seat and a thin margin with a sharp edge on the bottom to discourage inlet tract reversion. Corresponding exhaust valve has a thicker margin to resist higher temperatures and a generous radius on the bottom to encourage exit flow around the valve. Usually steel valves like a 12* back angle have more reverse flow than a ti valve with a 25* back angle and back cutting the 12* makes. After the valves have been lapped, a backcut is placed on the back of the valve, close up to the inner edge of the 45° seating area. The exhaust valve has to withstand much higher temperatures than the intake valves so they are usually made of a stronger high temperature alloy. Back cutting a valve increases flow at certain relatively low lifts because of the geometry.

Exhaust Cut out Valve Muffler Valve Exhaust System with Remote Control

Back Cut Exhaust Valve Back cutting a valve increases flow at certain relatively low lifts because of the geometry. Corresponding exhaust valve has a thicker margin to resist higher temperatures and a generous radius on the bottom to encourage exit flow around the valve. Back cutting a valve increases flow at certain relatively low lifts because of the geometry. After the valves have been lapped, a backcut is placed on the back of the valve, close up to the inner edge of the 45° seating area. Intake valve (left) has a 30° back cut above the seat and a thin margin with a sharp edge on the bottom to discourage inlet tract reversion. The exhaust valve has to withstand much higher temperatures than the intake valves so they are usually made of a stronger high temperature alloy. I think this is pretty universally the case in vast. Usually steel valves like a 12* back angle have more reverse flow than a ti valve with a 25* back angle and back cutting the 12* makes. Otherwise it can be used.

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