Motor with the lowest idle possible, 13-14RPM with relaxing sound

I tried to make a 1969 Dodge Charger Daytona so, ¯_(ツ)_/¯

Tuned version of the 2.9L Ferrari F40 engine. Bigger stroke pushing it to 3.4Liters, 10500 rpm redline, over 740 Hors...

Engine type: Inline-4 Displacement: 1441 cc Power: 195 HP Torque: 154 Nm

Very inefficient i1 3cc 7hp 18lb-ft engine. (was 6hp 15lbft) Top speed is >28mph. Really slow acceleration on a 1875k...

Engine type: 90° V-Twin Displacement: 999 cc Power: 120 HP Torque: 97 Nm

This thing has an absolute massive cam in it and revs to a ridiculous 10000 rpm (updated 10/13/23 now has a cammed up...

Engine type: 90° V4 Displacement: 1103 cc Power: 189 HP Torque: 111 Nm

Engine type: Crossplane Inline-4 Displacement: 998 cc Power: 139 HP Torque: 104 Nm

tuned, ported, on 100 octane. its pretty spicy but not unrealistic like my other 6.2. also, these are 4v instead of 2...

Engine type: 90° V-Twin Displacement: 1198 cc Power: 147 HP Torque: 124 Nm

Power: 626 CV Torque: 780 Nm Aspiration: supercharged Application: Mercedes-Benz SLR McLaren (2004-2010)

Ducati Diavel Engine type: 90° V-Twin Displacement: 1198 cc Power: 162 HP Torque: 127 Nm

A opel with an economy CVT gearbox. credits for engine: Aerodymeus

Harley-Davidson 1250 Night Rod Special Engine type: 60° V-Twin Displacement: 1247 cc Power: 126 HP Torque...