A single engine aerobatic pilot reported a momentary engine power loss causing concern about the aircraft. The pilot headed back to their home base and momentarily entered SAN Class B airspace.

Narrative

My passenger (a CFI) and I were performing aerobatic maneuvers at 5000 FT in a commonly-used practice area in San Diego. The terrain is uneven and unpopulated. We experienced an unexplained momentary; partial loss of engine power. We immediately vectored towards Ramona (RMN); the closest emergency landing area. We kept our altitude even though it put us barely within the San Diego Class Bravo airspace above RMN. We circled over RMN checking all the engine systems. When we felt comfortable that the engine was OK; we returned to SEE; maintaining our altitude. We returned over the airport at 5000 FT talking to the Tower; and circled down into the pattern and landed uneventfully. We were experiencing difficulty talking to the Tower due to the open cockpit and radio noise; but I do not believe the SEE Tower personnel heard from San Diego TRACON regarding my airspace incursion. I still feel compelled to report this. I have flown in San Diego for years and have never had an issue with SOCAL TRACON. This circumstance was special and I was trying to be careful; while dealing with less-than desirable radios. I am addressing the radio noise in my biplane and will fix it prior to further flight.