Decide to start a build thread of what I am doing. Will start with the head work, followed by the motor it is going on. Not sure of its going on the 208 or the 212 clone yet. No these are not predator motors either. Both getting clone rods, cams and flywheels.
So I have posted this or something similar in the past but thought a few people might like this. I have a GX160 head that's the UT1 NOT UT2. It has an 18cc chamber and 26mm intake and 23mm exhaust valves. It dose not use lash cap on the exhaust. Neat looking head but have yet to install one on a running motor. The intake and exhaust ports are a little smaller than the 196 clone heads.
My hopes are that the larger intake valve and smaller runner will make better torque than a 196 clone head. I'm hoping that the staggered valve size should help create a better torque curve than a normal GX200 style head would in the 2,000-5,500 RPM power band I intend to use it in. This head is just going to get the short side radius rounded and the port edges knocked down with some 80 grit. I am hoping to get a valve job done by a shop if possible but might just end up lapping some valves in and running it that way for a while.
Some people think that larger valves are only for high RPM motors but they can also be good for low RPM torque too. At low lift as valve is close to seat the valve is the restriction not the port so increasing the valve flow area creates more flow at low lifts and should help with torque. My thoughts are smaller port, larger intake valve 18cc chamber and smaller exhaust valve should all = more low and mid range torque on a stock motor. Going to put pictures below in a few posts so its not one long running post...
So I have posted this or something similar in the past but thought a few people might like this. I have a GX160 head that's the UT1 NOT UT2. It has an 18cc chamber and 26mm intake and 23mm exhaust valves. It dose not use lash cap on the exhaust. Neat looking head but have yet to install one on a running motor. The intake and exhaust ports are a little smaller than the 196 clone heads.
My hopes are that the larger intake valve and smaller runner will make better torque than a 196 clone head. I'm hoping that the staggered valve size should help create a better torque curve than a normal GX200 style head would in the 2,000-5,500 RPM power band I intend to use it in. This head is just going to get the short side radius rounded and the port edges knocked down with some 80 grit. I am hoping to get a valve job done by a shop if possible but might just end up lapping some valves in and running it that way for a while.
Some people think that larger valves are only for high RPM motors but they can also be good for low RPM torque too. At low lift as valve is close to seat the valve is the restriction not the port so increasing the valve flow area creates more flow at low lifts and should help with torque. My thoughts are smaller port, larger intake valve 18cc chamber and smaller exhaust valve should all = more low and mid range torque on a stock motor. Going to put pictures below in a few posts so its not one long running post...