According to Official Guinness Records,
The largest collection of model internal combustion engines is 1,126 and was achieved by Daniel Sitter (USA) in Fontana, California, USA, on 23 July 2016. Daniel began collecting model internal combustion engines in 1958. That same year he began making model airplanes and rockets to be tested sub sonic, supersonic, and hyper sonic wind tunnels.
For a complete list of 2016 records, please visit 2016 Guinness Records in United States.