I built a predator for my yard kart that I play around with. It's not for racing or anything, mainly just for learning about engines. I've started getting valve float (no contact with piston though) and want to fix this problem. The easy and correct answer if PROBABLY change the gearing but I wanted to get some other opinions. Anyways, these is how it is built.
-predator 212 block non-hemi
-dyno cams CM .265 cam
-stamped 1.3 rockers (I know....)
-decent port and polish
-arc billet flywheel
-arc +.020" billet rod
-flat top hemi piston
-Chikuni "vm22" carb
-.009" head gasket (.035" piston to head)
-milled head to get .135" pv clearance
-22# valve springs
-lightly reground valves to verify uniform seating
-stock valve train
-no governor obviously
-homemade exhaust with ttr125 muffler (maybe too large?)
I top out right at 42mph with my current gearing. Its a 12tooth really crappy/cheap clutch from Amazon and the sprocket that came on the frame (I haven't counted the teeth)
I have a set of 26# springs that do not bind but understand that these will exceed the limitations of what the stock valve train should withstand. Is there anything else I can do to limit valve float besides springs, regearing or adding a governor?
If I do need to go to heavier springs, and therefore need new valves & pushrods (a good opportunity to correct some valve train geometry) is there a recommended weight to get the most out of my build?
Also where else can I find improvements in this motor, ie. e85, different cam, different carb, something I don't even know of???? This is my first build and it has been a fantastic learning process.
Thank you!!!
-predator 212 block non-hemi
-dyno cams CM .265 cam
-stamped 1.3 rockers (I know....)
-decent port and polish
-arc billet flywheel
-arc +.020" billet rod
-flat top hemi piston
-Chikuni "vm22" carb
-.009" head gasket (.035" piston to head)
-milled head to get .135" pv clearance
-22# valve springs
-lightly reground valves to verify uniform seating
-stock valve train
-no governor obviously
-homemade exhaust with ttr125 muffler (maybe too large?)
I top out right at 42mph with my current gearing. Its a 12tooth really crappy/cheap clutch from Amazon and the sprocket that came on the frame (I haven't counted the teeth)
I have a set of 26# springs that do not bind but understand that these will exceed the limitations of what the stock valve train should withstand. Is there anything else I can do to limit valve float besides springs, regearing or adding a governor?
If I do need to go to heavier springs, and therefore need new valves & pushrods (a good opportunity to correct some valve train geometry) is there a recommended weight to get the most out of my build?
Also where else can I find improvements in this motor, ie. e85, different cam, different carb, something I don't even know of???? This is my first build and it has been a fantastic learning process.
Thank you!!!
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