Thread: pv question
10-31-2008, 07:42 AM #1
im about to have some cylinders bore and plated to 87mm
after this is done whay is everyone doing to the pvs?
10-31-2008, 09:20 AM #2
PV's have to be adjusted to clear the pistons .015" min when fully closed and blended to match the exhaust port when fully open.
10-31-2008, 07:40 PM #3
jeff curry says i dont even need to put them in but i really wanted another opion
this will be on a 2 cylinder in a standup
10-31-2008, 08:27 PM #4
All I can say is they hit a lot harder with them functional, the ones GK did where they pinned them open are not even close on the bottom end. Give professor Lowell a call he will school you on these. I guarantee it will make sense after talking to him.
10-31-2008, 10:07 PM #5
i understand the theory
was gonna le tjeff machine my gas valves to match the bore
thats when he told me i didnt even need them and it was a waste of my $
he told me the pv really dont make any difference in 87mm 66e motor
im currently running 84mm 60t npv cyl
10-31-2008, 10:40 PM #6
Never worked with Jeff, If he is doing your motor I say go with his advice and guidance, ultimately he is responsible for the outcome.
10-31-2008, 11:21 PM #7
I had mine done. Lowell did by 87mm and matched the valves to them. Its like a work of art!!!!
Have not tested the ski yet though. In a month or two will have numbers for all!
11-01-2008, 09:17 AM #8
all im doing is bb no porting
top end isnt a factor as its in a stand up and anything over 1/2 throttle is so damn squirly
i have read where people pin the valves open
11-01-2008, 09:57 AM #9
If its bottom end you want, pin them in the down position.
11-10-2008, 10:47 PM #10
You can get the power valve controller from pro-tec and just have the valves come on at a really high rpm. This way you don't have to mod the engine...
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