Bill, does Betty Lou have any problems cocking these?
You can also do the backdraft mod, and change it at will.If you simply drill a hole into the face of the piston, it will de-comp. If you go too deep, a bit of epoxy will refill to a depth that works for you.I highly recommend backdrafting with a 117 ring. The rings last, and the ESs drop to amazing levels.Good job TomRob! LOL... Tom is right... slug it often as you sneak up on your choke... you'll feel when you are close. Try shooting it before you go the last little bit, you may already be where you need it.
I've never thought about what non-concentric bores would do when choked. It has to push them out of round... right?
Boats,I went back thru this thread. To detune mine, I chucked the piston up in my lathe and bored its face. I set the tool at 45 degrees of lead and bored to a max dia. of .900" and to a depth of .065". That lowered the cocking force to 20 pounds. It works well for me. So my question is... those of you who detuned... how deep did you make the dish in the piston? And was it just a uniform concave dish?
It will go into a tapped hole in the valve body, and the piston will be relieved just enough to close over it's head... MSP.It's a forged steel (3K) 1/8" plug (drilled, then bored), and a shortened Ninja valve. Time to take these little sweeties into the next level of speed... no?