Slip decides to become a race car driver and cash in on the prize money. Driving Mahoney's Meteor, he racks up less than stellar speeds. Meanwhile, Sach and Professor Bosgood Elrod come up with a formula that causes explosions, makes beautiful women appear and cars go faster. Everything looks too good to be true and with the Bowery Boys, it usually is. Some shady characters want to get their hands on the formula to win the next big race.
Personally, I find Jalopy to be one of the better Bowery Boys movies, providing plenty of laughs & chuckles.
In 1945, when East Side Kids producer Sam Katzman refused to grant Leo Gorcey's request for double his weekly salary, Gorcey quit the series, which ended immediately. Bobby Jordan then suggested a meeting with his agent, Jan Grippo. Grippo, Gorcey, and Hall formed Jan Grippo Productions, revamped the format, and rechristened the series The Bowery Boys (the film credits appear as: "Leo Gorcey and The Bowery Boys"). Gorcey, who owned forty percent of the company, starred, produced, and contributed to the scripts. The new series followed a more established formula than the prior incarnations of the team, with the gang usually hanging out at Louie's Sweet Shop (reportedly at 3rd & Canal St.) until an adventure came along.
The main characters were Terrence Aloysius "Slip" Mahoney (Leo Gorcey), Horace Debussy "Sach" Jones (Huntz Hall), Whitey (Billy Benedict), Chuck (David Gorcey, sometimes billed as David Condon), and Butch (usually Bennie Bartlett, occasionally former East Side Kid Buddy Gorman). The proprietor of the malt shop where they hung out was the panicky Louie Dumbrowski (Bernard Gorcey, Leo and David's father). Perhaps to emphasize they were no longer teenagers, the "boys" now wore suits; and their mothers, who appeared in some of the "East Side Kids" series were no longer seen.
Like the previous incarnations of the team, the members went through a number of changes over the course of the series. Thirteen actors were members of the team at one time or another. Bobby Jordan, an original Dead End Kid, appeared in the first eight films, but left after being injured in an elevator accident. Jordan was also unhappy with the direction of the series, which favored Gorcey and Hall, excluding the rest of the cast. "Sunshine" Sammy Morrison (aka "Scruno" in the East Side Kids films), declined the invitation to rejoin the gang and took a long hiatus from acting.