Petrol-paraffin engine: Difference between revisions

Petrol-paraffin fuelling is suitable for [[four-stroke cycle]] piston engines and [[wankel engine]]s. A petrol/paraffin engine tends to run hotter whilst burning paraffin, and so the cooling system must be sufficiently robust. Being slower burning, the paraffin requires the longer combustion period that a four-stroke engine can provide; so [[two stroke|two-stroke]] versions are rare. [[JA Prestwich Industries|J.A.P.]] used their 16H engine on TVO.{{cn|date=September 2016}} Although modern petrol engines may have compression ratios typically between 9:1 and 12:1, a petrol-paraffin engine requires a lower [[compression ratio]] of 8:1 or less, to avoid pre-ignition of the fuel-air mixture which would cause damage from [[engine knocking]]. Most existing petrol aero-engines have low compression ratios, around 8:1 or 9:1, making dual-fuel conversions viable.{{Citation needed|date=August 2011}} <!-- see talk page about compression ratio -->