Post by 90GTVert on Feb 16, 2010 7:17:07 GMT -5
NCY 1100-1250 Camshaft
Here are my measurements for the lobe lift of the stock cam and the performance cam.
--------------------------Intake Lobe Lift-------Exhaust Lobe Lift
Stock GY6 50cc Cam :_________0.184"____________0.177"
NCY 1100-1250 Cam :_________0.184"____________0.178"
These need to be very precise measurements when dealing with such small numbers, and I'm just using a cheap set of digital mics. I could be off a little, but there doesn't seem to be any great improvement in lift. It stays the same on the intake and gains 0.001" on the exhaust according to my measurements. I must admit, that's disappointing. I have no idea what the rocker arm ratio is on these little engines, but (just pulling a number from the sky) say it's 2.0:1, that means I would still only be gaining .002" on the exhaust side.
So much for really cranking the valves wide open to get air flowing.
Now, here's the bright side of the cam. It does appear to have a longer duration. That will help to keep air flowing at higher revs. I don't have any numbers, but you can see the longer duration just by looking at the lobes.
Here are my measurements for the lobe lift of the stock cam and the performance cam.
--------------------------Intake Lobe Lift-------Exhaust Lobe Lift
Stock GY6 50cc Cam :_________0.184"____________0.177"
NCY 1100-1250 Cam :_________0.184"____________0.178"
These need to be very precise measurements when dealing with such small numbers, and I'm just using a cheap set of digital mics. I could be off a little, but there doesn't seem to be any great improvement in lift. It stays the same on the intake and gains 0.001" on the exhaust according to my measurements. I must admit, that's disappointing. I have no idea what the rocker arm ratio is on these little engines, but (just pulling a number from the sky) say it's 2.0:1, that means I would still only be gaining .002" on the exhaust side.
So much for really cranking the valves wide open to get air flowing.Now, here's the bright side of the cam. It does appear to have a longer duration. That will help to keep air flowing at higher revs. I don't have any numbers, but you can see the longer duration just by looking at the lobes.