Quote Originally Posted by matt5112 View Post
why you say compression?

Compression is static.

The optimal time for pressure peak due to combustion is 20* ATDC.

Give or take a few... as it does very much vary based on application.

The issue is, fuel doesnt burn instantly. But thats a good thing.

Otherwise it'd be like setting off a bomb in your cylinder.
Because there is less compression at that moment in the stroke...

Here:
Trailer Park Boys :Rickyisms - YouTube