My name is Werner Staubli from Johannesburg, South Africa. I have a Ford 1946 Jailbar with a Cleveland 408. We are running a 13:1 compression ratio, hence we need to run 102 octane for ultimate performance. The problem is that its hard to come by, damn expensive and not practical when travelling long(ish) distances, so the timing has been retarted and is now running off 95 octane.
We obviously had issues with pre ignition as a result, and managed to tune it now that I cannot hear pre ignition anymore. After speaking to other mechanics, their view is that we should reduce the compression to avoid pre ignition and get the most potential from the engine.
What are your thoughts and what (best) methods are there to achieve this ?