There seems to be so many opinions on what compression ratios will work with what fuel. Maybe a little more detailed explanation of the why and how is needed.
Any volunteers?
High compression will pound the piss out of the engine's internals.
11:1 with 93 octane is probably as high as I am comfortable with Pete.
I can't give you an solid numbers because there are too many factors to consider.
How much cylinder presure you develop at what RPM will begin to detonate.
How much timing.
How well is your carb working ( lean detonates rich less so but is lazy ).
Above 12 your effectively a diesel and now you need to prevent the natural desire of the fuel to detonate.....
What is your chamber shape.
How hot is the combustion chamber.
What kind of valves are you running.
What type of plug.
The people who realy know what's going on at 13:1 may or may not even bother reading this thread because they have been there and done that, switched to methanol and have no real interest in discussing gasoline.....
And an engine that burns gasoline and puts out 20hp will not put around.
It will be ill tempered and running at the limits for what a clone block can even be helds together.
Think lower compression and milder build.
12 hp is reasonable and achievable to most people.
Moving beyond that gets real expensive and requires you realy know what your doing.
