Hi,

Choosing parts and strategy on new engine build based on 7R small spigot case.
I have to find save compression ratio for the fuel quality in the netherlands.
We have on all pumps 95 octane and on many even 98 octane!

What would be the maximum CR if I will limit myself to a 2.5 liter engine?
Will be on webers IDA40 to start and maybe later on MFI in combination with mod S cams.

I am interested in max CR with or without twinplug.
I have been searching in the threads but difficult to find info as much is related to US fuel quality

Thanks,
Bart