Larry Doubley, the super freshman who leaps over cars, gave Southern California's title defense a giant boost today when he won the long jump with a meet record of 26 feet 11 3/4 inches in the 56th NCAA Track and Field Championships.

Doubley actually, reached that distance near the pit's end twice, once with aiding wind and the second time with a barely legal 4.4 miles per hour reading at his back.

Double victim of the 6-foot-8 Doubley's efforts was local hero Charlton Ehizuelen, a Nigerian wearing Illinois' orange and blue. Ehizuelen leaped 26-10 for second place and relinquished the record, a 26-11 established as the 1975 champion.

The narrow victory made Doubley, who drove coach Vern Wolfe to near apoplexy by clearing a car for TV a few weeks ago, the first American champion. Earlier today, Canadian Scott Neilson, of the University of Washington successfully defended his hammer crown witha throw of 228-4. Tito Steiner, an Argentine freshman at Brigham Young, won the decathlon Wednesday.

Terry Albritton of Stanford, who once held the world record, captured the shot put at 67-3 1/2. He threw three feet beyond his closest competitor.

Greg (Fly) Robertson of Maryland won his semifinal in the 110-meter high hurdles, waving his right fist as he broke the tape in a stadium record 13.68.

Five minutes later the stadium standard belonged to Robert Gaines of the University of Washington, who clocked 13.62. Defending champion Dedy Cooper of San Jose State was seventh in Gaines' heat and did not qualify for tonight's final.

Richard Massey of Howard wound up a nonqualifying sixth in his 400-meter semifinal. Massey showed none of his usual acceleration as he was timed in 46.82.

"Everything was heavy out there," Massey said. "I had nothing. I'm cramped up right now."

Asked whether he would be able to run in the 1,600-meter relay semifinal tonight, Massey said, "I'll have to."

Ian Pyka, a strong possibility for Maryland points in the shot put, managed only 59-5 3/4 and did not advance to the final. High jumper Brian Melly, 1,500 runner Tony Garner and long jumper Dennis Ivory, who injured his left hamstring, were wiped out in qualifying Thursday.

Neilson, a 6-foot-5, 250-pound sophomore from ew Westminster, British Columbia, had the four best throws in the hammer competition. He put it away with a 224-10 toss on his first attempt after Emitmt Berry of Texas-El Paso, thowing in the first fight, had launched one 221-4.

"I felt the pressure of Berry's throw," Neilson said, "but my biggest problem was judging the landing markes. I thought I was throwing 210 in practice, but I was actually 10 feet farther."

In the final round, Neilson had two mediocre efforts before concluding with 22637 and admitted, "I was getting a little boed. Neilson missed Al wschoterman's meet record by three feet but warned, "I'm thinking 238 this year and I'd like to be in the high 20s by the time I get out of here."

Paul Buxton, Washington State's Scottish import, had been expected to place second to Neilson, but instead foulee five times and wound up fifth Dwight Hidles was fourth for a Couga point yiele of six, little help to Washington State's tam title aspiations, Zerry's eight gave UTEP a boost.