2012 Manx Grand Prix Festival and Races were held between Saturday 18 August and Friday 31 August 2012 on the 37.73-mile Snaefell Mountain Course.
The Blue Riband event of the Manx Grand Prix Festival the 2012 Senior Manx Grand Prix held in damp conditions and rain produced an unexpected win for the Newcomer John Simpson riding a 675 cc Triumph at an average race speed of 106.526 mph. It was the first time the Triumph marque had won the prestigious Senior Manx Grand Prix since Don Crossley victory in the 1948 event at an average race speed of 80.63 mph and also the first Newcomer winner of the Senior Manx Grand Prix since Geoff Duke won the 1949 race at an average speed of 86.063 mph riding a Norton motor-cycle. After victory in the Junior Classic Race by Roy Richardson riding a 250 cc Yamaha raised his tally to 10 victories in the Manx Grand Prix Races with Ryan Farquhar also equaling the same total with a win in the Senior Classic Race riding a 500 cc Paton motor-cycle. Held over a reduced race distance of 3 laps the Junior Classic Race was won by Chris Palmer riding a 350 cc Honda and also a first time win in the Lightweight Classic Race for Peter Symes with a 250 cc Suzuki machine. The Junior Manx Grand Prix also produced another first time winner for Wayne Kirwan riding a 600 cc Yamaha motor-cycle after dominating most of the race and along with Nigel Moore in the Super-Twins race with a 650 cc Kawasaki also winning his first Manx Grand Prix. During the Super-Twin Race, while holding 2nd place, Trevor Fergusson crashed fatally at The Nook near to Governor's Bridge on the second lap.
After his father Robert Dunlop won the 1983 Newcomers Junior Manx Grand Prix the 2012 Classic Superbike race was won by Michael Dunlop at an average race speed of 112.545 mph to produce his second win on the Mountain Course during the 2012 racing season after also winning the 2012 Superstock TT race and raising his own tally to three Manx Grand Prix wins. The Newcomers Race was delayed by 1 hour due to weather conditions between the Bungalow and Brandywell produced the first Manx Grand Prix win by a competitor from the Czech Republic when Kamil Holan won the Newcomers Race 'A' at an average race speed of 106.683 mph riding a 600 cc Yamaha motor-cycle. Taking advantage of local knowledge in the inclement weather conditions on the Mountain section of course, the Isle of Man competitor Andrew Dudgeon won the Newcomers Race 'B' riding a 650 cc Kawasaki Super-Twin machine. The reintroduced Newcomers Race 'C' produced a win for James Cowton riding a 400 cc Honda motor-cycle.
Difficult weather conditions during Practice Week caused the first Saturday evening to be cancelled due to mist and fog on the Mountain Section of the circuit and also the Clerk of Course not being able to raise the minimum number of race marshals for the event. Problems with the weather continued on the first Monday evening practice session with the first practice session red flagged after 1 lap and the second Monday evening session the competitors were red-flagged at Parliament Square, Ramsey and then escorted back to the TT Grandstand by Travelling Marshals. The mixed weather conditions continued during the rest of Manx Grand Practice week and during Wednesday the evening session was red-flagged again to attend to an injured competitor near to Sarah's Cottage. After the commencement of the Friday evening Practice being delayed by a road traffic accident the session was later abandoned after a fatal accident to Manx Grand Prix newcomer Steve Osborne on Quarterbridge Road.
Saturday 25 August 2012 Mountain Course 3 laps â 113.00 miles
Fastest Lap: John Simpson â 109.808 mph (20' 36.96)
Saturday 25 August 2012 Mountain Course 3 laps â 113.00 miles (182.16 km)
Fastest Lap: Andrew Dudgeon â 103.580 mph (21' 51.33)
Saturday 25 August 2012 Mountain Course 3 laps â 113.00 miles (182.16 km)
Fastest Lap: James Cowton â 99.523 mph (22' 44.79)
Tuesday 28 August 2012 Mountain Course 3 laps â 113.00 miles (Reduced Race Distance)
Fastest Lap; Roy Richardson 102.327 mph (22 minutes 07.40 secs)
Tuesday 28 August 2012 Mountain Course 3 laps â 113.00 miles (Reduced Race Distance)
Fastest Lap; Peter Symes 93.535 mph (24 minutes 12.16 secs)
Tuesday 28 August 2012 Mountain Course 4 laps â 150.92 miles (242.80 km)
Fastest Lap; Wayne Kirwan 115.579 mph (19 minutes 35.20 secs)
Wednesday 29 August 2012 Mountain Course 4 laps â 150.92 miles (242.80 km)
Fastest Lap: Ryan Farquhar â 106.012 mph (21 minutes 21.25 secs)
Wednesday 29 August 2012 Mountain Course 4 laps â 150.92 miles (242.80 km)
Fastest Lap; Dave Madsen-Mygdal 103.606 mph (21 minutes 51.00 secs)
Wednesday 29 August 2012 Mountain Course 4 laps â 150.92 miles (242.80 km)
Fastest Lap: Nigel Moore â 111.746 mph (20 minutes 15.50 secs)
Wednesday 29 August 2012 Mountain Course 4 laps â 150.92 miles (242.80 km)
Fastest Lap: Tim Sayers â 105.655 mph (21 minutes 25.58 secs)
Friday 31 August 2012 Mountain Course 4 laps â 150.92 miles (242.80 km)
Fastest Lap; Michael Dunlop 115.560 mph (19 minutes 35.39 secs)
Friday 31 August 2012 Mountain Course 4 laps â 150.92 miles (242.80 km)
Fastest Lap; Chris Palmer 112.644 mph (20 minutes 05.82 secs)
Friday 31 August 2012 Mountain Course 4 laps â 150.92 miles (242.80 km)
Fastest Lap; Wayne Kirwan 117.189 mph (19 minutes 19.05 secs).