House Speaker Jim Wright (D-Tex.), asserting that his aim is to pursue "peace, not war" war in Central America, said yesterday that he is "not even going to speculate" about whether Congress will consider new military aid for Nicaragua's contras.

"My discussions with President Reagan and Secretary {of State George P.} Shultz were very clear and unambiguous; we do not talk about military aid and we do not talk about war until the peace process is completed," Wright told reporters after a luncheon in his office with ambassadors from four of the five Central American countries engaged in peace talks brought about in part by Wright's efforts.

Saying that the chances for peace appear "far better now than at any time in the last decade," Wright announced that, at his invitation, Costa Rican President Oscar Arias Sanchez, chief architect of the Central American peace negotiations, will visit Capitol Hill Sept. 22 and address House and Senate members.

Aid to the contras runs out Sept. 30, but Wright said that if progress is being made toward peace by that date, "obviously we would want to continue in that spirit." He added that White House officials, including national security adviser Frank C. Carlucci, have indicated to him that there is enough aid in the pipeline to sustain the contras at least through November. And he said there does not appear to be any pressing need for Congress to address the question of new contra funding.

His insistence that the emphasis should be on the peace process rather than aid for the contras pointed up anew the conflicting pressures that have buffeted the administration in the three weeks since the president and Wright announced a bipartisan plan for resolving the tensions between Nicaragua's leftist Sandinista government and its neighbors.

Their action spurred Nicaragua, El Salvador, Costa Rica, Honduras and Guatemala to adopt a separate cease-fire initiative proposed by Arias. The administration, while calling it "a step in the right direction," has made clear that it believes the Central American initiative lacks many of the Reagan-Wright plan's provisions for ensuring that Nicaragua loosens its ties with Cuba and the Soviet Union and allows a measure of internal democracy.

The Central American plan has stirred particular concern among Republican conservatives, who fear that it will lead to abandonment of the contras. As a result, the administration, which wants to mollify the right while keeping Wright on its side, has been forced into several contradictory statements that have caused confusion about what Reagan is trying to do in Central America.

In a radio speech beamed to Central America Monday night, Reagan reiterated administration promises not to undercut the contras. Last week, a senior administration official, who briefed reporters about Central America policy on condition he not be identified, said it would be a dangerous mistake for the United States to stop supporting the contras because it would take the pressure off the Sandinistas.

The official added that if there still is fighting between Sept. 30 and Nov. 30, the deadline set by the Central American plan for achieving a cease-fire, the administration "will have to ask Congress for some way of dealing with that period."

Asked how that squared with his assertion that the contras have sufficient aid in the pipeline, Wright mischievously replied that perhaps the unidentified senior official was Elliott Abrams, assistant secretary of state for inter-American affairs. Many House Democrats have called for Abrams to resign, charging that he misled Congress about the covert activities that were a subject of the Iran-contra hearings.

"I would hope that he would be more forthcoming with the press than he has been on occasion with Congress," Wright said.

"However, I shall not be lured into a partisan retort," Wright said about the statements by administration officials that appear to conflict with his understanding of the president's positions.

"President Reagan has a problem that is endemic to his party," Wright said. "There is a virulent right-wing faction that is opposed to the peace plan. Some don't want it to work. They only want a military solution . . . . I do not want to make it more difficult for the president."