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Where to put the hole on my Cruel?
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Author:  JustinWi [ Mon Oct 18, 2010 5:57 pm ]
Post subject:  Re: Where to put the hole on my Cruel?

Keep in mind what the hole placements do and their resulting effect on ball reaction.

P1 -20% reduction in drilled differential (On PAP)
P2 No change in drilled differential
P3 +20% increase in drilled differential
P4 +40% increase in drilled differential (On PSA)

P1=Less differential, later break point, more energy retention.
P4=More differential, earlier break point, earlier energy loss.


When a ball is bleeding energy too fast and not hooking, a P3 can make matters worse.




This is why I was curious how far apart the oil rings were, in order to help determine which way the differential needs to be modified.

Author:  Jaydubbayu [ Mon Oct 18, 2010 8:14 pm ]
Post subject:  Re: Where to put the hole on my Cruel?

Ok I probably should've waited but.. there's a p3 hole in there now. Nothing seems improved. I'll probably have to plug this up and start over.

After doing this today, I threw some and I got to see the oil lines. They were about 1/4" apart, maybe a little more.

Author:  plamormick [ Mon Oct 18, 2010 10:21 pm ]
Post subject:  Re: Where to put the hole on my Cruel?

Well, now I feel like a nub. I had the numbers backwards in my head- thanks for the correction justin.

Would a p1 hole have helped here instead? 1/4" spacing between oil rings doesn't sound like a lot, given what has been described for reaction. Curious.

Author:  JustinWi [ Mon Oct 18, 2010 11:49 pm ]
Post subject:  Re: Where to put the hole on my Cruel?

1/4" flare separation after the P3 hole?


Before plugging it, try 500 Abralon. It worked well on Mick's, he was seeing a similar situation.

What may be happening is a mismatch of core torque and cover strength. With a 75* angle sum the block may just be freewheeling because the cover can't create enough friction to match up and make use of the energy the block is releasing.

Author:  Jaydubbayu [ Tue Oct 19, 2010 12:36 am ]
Post subject:  Re: Where to put the hole on my Cruel?

Ok in the event that I have to redrill, what would you suggest for a redrill pattern? I'm slightly speed dominant, I don't know my axis tilt. My PAP is 4 1/8" right, 1/4" up. From a past post, someone said that a higher angle sum is necessary here. So what are some ideas for me?

My thoughts are:
75x4.5"x50 (same as my sr2)
130x4"x80

And I'm done. Let me know what you think.

Author:  Jaydubbayu [ Wed Oct 20, 2010 3:20 am ]
Post subject:  Re: Where to put the hole on my Cruel?

bumpage, cause I edited my last comment.

Author:  JustinWi [ Wed Oct 20, 2010 10:28 am ]
Post subject:  Re: Where to put the hole on my Cruel?

What sort of reaction are you looking for?

Stay away from a drilling angle of 130*. That is asking for more trouble than you already have.

Author:  Jaydubbayu [ Wed Oct 20, 2010 11:07 pm ]
Post subject:  Re: Where to put the hole on my Cruel?

Get thru the heads and have a good backend reaction. I'd like it to be a ball that I can get left of all the track players in leagues. I can get it in and stay in and it'll hold and hit. I can get in, swing out, and it comes back. Asking for a lot, I know.

I Throw about 17-18 mph, decent amount of revs. I don't know a lot about my own game I guess. Tilt, etc...

I like the way my sr2 reacts at 75x4.5"x50, pin up, p3 hole, maybe p4 actually. How would the ball react with that drilling?

Author:  Jaydubbayu [ Thu Oct 21, 2010 7:48 pm ]
Post subject:  Re: Where to put the hole on my Cruel?

Get thru the heads and have a good backend reaction. I'd like it to be a ball that I can get left of all the track players in leagues. I can get it in and stay in and it'll hold and hit. I can get in, swing out, and it comes back. Asking for a lot, I know.

I Throw about 17-18 mph, decent amount of revs. I don't know a lot about my own game I guess. Tilt, etc...

I like the way my sr2 reacts at 75x4.5"x50, pin up, p3 hole, maybe p4 actually. How would the ball react with that drilling?

Author:  JustinWi [ Thu Oct 21, 2010 11:07 pm ]
Post subject:  Re: Where to put the hole on my Cruel?

I have been seeing good results with the 60x20@4.5" for slightly speed dominant folks. Place the hole after you throw it to fine tune the reaction.

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