bansheeseat$$ Posted December 9, 2008 Report Posted December 9, 2008 I know there are some cubs that will put my PV motor to shame.....but I do love my cheetah powervalve for the low end torque for the dune riding..... :biggrin: Quote
firebanshee Posted December 9, 2008 Report Posted December 9, 2008 I am gonna be building a drag motor nothing insane but some i need to know what the power valves are and if the are worth getting. Power valves change the ceiling height of you exhaust port depending on what rpm your motor is at, the lower rpm it lowers your ceiling height giving you more bottom end and at higher rpm it raises it giving you more top end.If you are building a drag motor you don't need power valves cause you are wide open all the time anyway, duners or trail or mx riders mainly use power valves. You can use them to drag but most people don't , they usually install block off plates instead of the valves. The valves cost more and give you no advantage on a drag bike. Quote
Handyman Posted December 9, 2008 Report Posted December 9, 2008 I am gonna be building a drag motor nothing insane but some i need to know what the power valves are and if the are worth getting. A cub and powervalve cylinders produce right about the same peak HP... If you want to get into a cheaper motor go with the cub set up...Some of the big dogs are running the powervalve cylinders with the powervalves block off plates.. :biggrin: yes yoru bike was the first one that popped in my head when I wrotwe that.....I'm thinking about dropping the 17cc domes in...just wait I might be able to keep up with you... Quote
vulvafan537240 Posted December 9, 2008 Report Posted December 9, 2008 Power valves change the ceiling height of you exhaust port depending on what rpm your motor is at, the lower rpm it lowers your ceiling height giving you more bottom end and at higher rpm it raises it giving you more top end.If you are building a drag motor you don't need power valves cause you are wide open all the time anyway, duners or trail or mx riders mainly use power valves. You can use them to drag but most people don't , they usually install block off plates instead of the valves. The valves cost more and give you no advantage on a drag bike. i would think that the lower rpm torque gained from the powervalve would be benefiecial in a drag race. Quote
bansheeseat$$ Posted December 10, 2008 Report Posted December 10, 2008 yes yoru bike was the first one that popped in my head when I wrotwe that.....I'm thinking about dropping the 17cc domes in...just wait I might be able to keep up with you... Sorry Matt I meant to delete the part about the some cubs part of your reply to.The :biggrin: was about that you are happy with it.Not the who's is faster then the other.Sorry very very much.Will you ever forgive me.Pretty please! Hey but that would be cool for you to add some compression to her and come shread my sandbox :biggrin: Quote
bansheeseat$$ Posted December 10, 2008 Report Posted December 10, 2008 i would think that the lower rpm torque gained from the powervalve would be benefiecial in a drag race. Maybe if you where doing a rolling start at 5 mph or so and was not allowed to use the clutch Quote
Handyman Posted December 10, 2008 Report Posted December 10, 2008 Sorry Matt I ment to delete the part about the some cubs part of your reply to.The :biggrin: was about that you are happy with it.Not the who's is faster then the other.Sorry very very much.Will you ever forgive me.Pretty please! Hey but that would be cool for you to add some compression to her and come shread my sandbox :biggrin: I'm not worried about people knowing who's faster..i will admit to it..If i was worried about that i would have bought a 535cc by now..(which I'm plannign to build little by little over a long period of time) yeah i plan bringing up the compression and see how it runs then...I know it will be a big difference Quote
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