It's generally accepted that compared to a car, the cover (grip) is the tires and the core is the engine. Even if you want to ignore the core for a bit, if the cover is 90% of the reaction (which I've never seen anyone state before), if there was a market for a Pink, Blue, Black, and Burgandy Hammers because the covers were different (maybe same/similar/different grits? don't remember), surely a Lane#1 cover would react different than a Storm cover and they would both react different than a Hammer cover. Enough of a difference to justify a new purchase? That's for each person to decide.
Bowling balls cost a lot more now than they did in the days of the Blue Hammer. My Slate Blue Gargoyle was cheaper than $150, but not the $70 you can occasionally find an old Hammer for. Even so, many are used, and most are 16# which not many throw anymore. Now if I had access to a new 15# Blue Hammer, would I choose it over a new $150 Liberator? Probably. I got a great deal on a used Thunderflash several years ago, and I still have the Slate Blue Gargoyle.
Now, back to the cores. The Tsunami is the smoothest ball I have ever rolled. It has the same cover on it (or one so close that it's not worth mentioning) that Brunswick has on other balls. I can only attribute it to the action of the core. Most people regard the core as 20-30% of the ball's motion. I also had a Blue Dot and currently have an XXXL. While the cover's are different, I doubt there is a big difference in one polyester cover compared to any other. Again, I attribute the difference to the core. Sure, this is a 2 piece core compared to a pancake, but it shows that the core is important. Compare a strong asymmetric cored ball to one with a simple symmetric one. There are plenty of examples of both types of cores in the same cover stock. They will roll different.
A lot of people say the bomb core rolls different than the standard diamond. I don't own anything with the bomb core to give my opinion, but enough people say it for me to believe it. Now if you don't want to buy a Liberator, don't, but at least do it for the right reason. Most of us own 3-10+ resin balls. If you bowl on certain conditions, there's nothing wrong with owning different urethane balls.
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Penn State ProudSpecial thanks to Lane#1 for donations to two consecutive Ballreviews Get Togethers.
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