PORSCHE RACING HISTORY1981 - Portland 100 Miles
2 August 1981 - Portland International Raceway, USA
Gianpiero Moretti second in a Porsche 935/81, 1 lap behind the winning Lola T600 driven by Brian Redman
Overall - 2nd, 3rd : GTX - 2nd, 3rd : GTP - 2nd
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 30 | Porsche 935/81 | JR-001 | GTX | Gianpiero Moretti (I) | Momo/Penthouse (I) | 2nd | 2nd | 10th | 52 laps |
| 9 | Porsche 935 K3/80 | 009 00030 | GTX | Bobby Rahal (USA) | Garretson Racing (USA) | 3rd | 3rd | 4th | 52 laps |
| 0 | Porsche 935 K3/80 | 000 00010 | GTX | Ted Field (USA) | Interscope Racing (USA) | 5th | 5th | 5th | 52 laps |
| 46 | Porsche 935 J | 000 00012 | GTX | Mauricio DeNarváez (COL) | DeNarvaez Enterprises (CO) | 7th | 7th | 6th | 50 laps |
| 28 | Porsche 911 Carrera RSR | 911 460 0059 | GTO | Neil Shelton (USA) | Neil Shelton | 9th | 2nd | 15th | 49 laps |
| 54 | Porsche 911 Carrera RSR | GTO | David Schroeder (USA) | David Schroeder (USA) | 12th | 5th | 18th | 47 laps | |
| 04 | Porsche 911 Carrera RSR | 911 560 9119 | GTO | Rene Rodriguez (USA) | T & R Racing (USA) | 14th | 7th | 19th | 47 laps |
| 49 | Porsche 911 Carrera RSR | 12803002 | GTO | Bob Copeman (USA) | R. C. Copeman Racing (USA) | 15th | 8th | 21st | 46 laps |
| 17 | Porsche 911 Carrera RSR | 911 410 3631 | GTO | Karl Durkheimer (USA) | Karl Durkheimer (USA) | 17th | 10th | 24th | 45 laps |
| 58 | Porsche 911 Carrera RSR | 911 560 9121 | GTO | Chuck Kendall (USA) | Chuck Kendall (USA) | 18th | 11th | 23rd | 44 laps |
| 1 | Porsche 935 K3/80 | 000 00011 | GTX | John Fitzpatrick (GB) | John Fitzpatrick Racing (GB) | 27th | 13th | 3rd | 0 laps - DNF |
IMSA - International Motor Sport Association
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