bill shoe wrote:Lurk wrote:Renault recently reveals some F1 engine particularity on a public web note (maybe it was only in french?). They said that F1 engine cannot do cold start physically. Piston is slightly oval while cylinder is round and so the piston is stucked in the cylinder. When heated up & due to thermal dilatation, piston & cylinder get their "working" shapes and engine can be started. If I remember well, minimum temperature was 50°C.
A shame the website I saw it do not keep a lot of archives, I cannot retrieve it
Interesting. If there is an interference fit between cylinder and piston at ambient temp, this implies the pistons must be assembled into the engine when the block and pistons are warm (~50C).
If a temperature differential was required for assembly would it not be more in keeping with standard engineering practice to freeze one of the parts as opposed to heating the other?