Up to now, 1.8-liter B18 engine of Honda had been used in F4.
However, the use of 2-liter engine is admitted in the regulation in 2010.
Toda racing supplies the K20A engine of Honda.
Tom 's receives the technical co-operation of Ken Matsuura racing service, and they supply 3ZR engine of Toyota.
These three companies are members of JMIA.
In F4 at the next season, "engine war" starts.
http://www.jmia.info/journal/jounal091202.html