AMF: Green Mamba

by Bob Johnson 0

55 Hook 14.5 Length 15 Breakpoint Shape

Manufacturer’s Intent: “The Green Mamba features the SRC (self-righting core) for the first time in an AMF release,” says Eric Thomas. “The SRC is paired with the F74 cover. The F74 shell helps the Green Mamba bite through heavier oil conditions; provides a strong, defined hook with continuation, and makes it the perfect complement to the Black Mamba [April 2012].”

Core Design: The SRC asymmetric core was first used by 900 Global. It’s now AMF’s turn to reap the benefits of this early revving, smooth-motion core shape. The RG is low at 2.48, while the differential is beefy at .054. The intermediate diff is strong at .020. Strong drillings can produce nearly 6 inches of track flare.

Coverstock: AMF’s F74 reactive cover is colored in medium green and ivory. The factory surface is sanded with the NEAT system at 4000 grit. Oil traction is above average, as is response time off friction. The Ra level tests at medium levels, which is best for medium-heavy to heavier oil volumes.

Test Results: The Green Mamba’s strong asymmetric core and aggressive coverstock combine to produce one of AMF’s strongest balls to date, even at its 4000-grit finish. When compared to a like-drilled Black Mamba, the Green Mamba hooked a similar amount but slightly later and more angularly. When sanded with the same surface as the Black Mamba (1500 grit), the new ball hooked 3 to 4 boards more with similar length and breakpoint shape. Overall, both balls will work well in the heavy stuff, but their motion shapes are different. Polishing either ball reduced hook three to five boards and gave us better match-ups for slower ball speeds and on lesser oil amounts.

When to Use: We used the Green Mamba with success on fresh THS and heavier PBA Sport shots where traction was a necessity. On the THS, we enjoyed the ball’s ability to blend out the side-to-side wet/dry characteristics. On heavier Sport shots where traction and a controlled move off the pattern were needed, we were rewarded in spades. We even drilled one with a 3-inch pin distance near the ring finger and a 6-inch weight hole from the pin. This layout opened up both THS and Sport patterns, and was easy to stay with throughout the transition.

Bob Johnson

Bob Johnson has received more national writing awards than any other bowling writer — close to 70 over the course of his 40-year career. He began at age 16 as a staff writer and then assistant editor for the weekly Pacific Bowler newspaper in his native California, and within three years was writing feature stories for Bowlers Journal. He has written for the magazine ever since, except for a five-year span when he was hired as the founding editor of another magazine. He moved to Chicago in 2000 and spent 13 years in the Windy City, including five as Bowlers Journal’s Editor. In 1975, Johnson received the Robert E. Kennedy Award as California’s top undergraduate high school journalist. Five years earlier, on the lanes, he had shared the Bantam Division Doubles championship in the Orange County Junior Bowling Association Championships. Today, he continues to work full-time for Bowlers Journal as its Senior Editor, to write his popular “Strikes Me” column, and to edit Luby Publishing Inc.’s weekly business-to-business Cyber Report.

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