Dynamic Compression Ratio on E10 pump gas

There is some older information out there on rule of thumb for DCR when balancing camshafts and compression ratio, but I'd like to know if anyone here has modern data.

The engine I'm getting into is an all aluminum 2 valve carbureted setup with fixed mechanical timing advance and it will be a full street car. The commonly available pistons are advertised at 10:1 static compression and the uprated intake cam is 291* duration w/IVC @ 52*, which maths out about 8.6 Dynamic Compression Ratio. I've seen some other comparable set ups which are operating in this same area, so I believe it is a reasonable target.

Our pump gas is 93MON with about 10% ethanol content.

I think you're concentrating on the wrong thing, you need to have at least a 2D, preferably 3D, mapping option first.

As is, you're going to have to set your ignition timing to the maximum allowed by detonation/best torque, and that's going to severly compromise anything other than full throttle at around peak torque. anything else is going to SERIOUSLY compromise a "street" engine, unless you like poor throttle response, fouling sparkplugs and having even poorer fuel economy.

You may also like to check the fuel octane number - the US uses PON (Pump Octane Number), which is the average of RON and MON, (MON + RON)/2.

For the camshaft, no specific recommendations other than making sure it matches the rest of the engine's build. If you have the piston to valve clearances, you can try swinging the camshaft timing in 2 degree increments to find the sweet spot, this can make a significant difference, especially as it's unlikely the cam' grinders have exactly the grind you need - but they should be close.