What gas do you use for 13 1 compression?

Light weight helps you get to your design goals, but the most interesting part about the Skyactiv engine is its ability to run a sky high 13:1 compression ratio on inexpensive 87 octane unleaded fuel. (Skyactiv engines in other countries run 14:1 compression ratio but must run 91 or higher octane fuel).

What is the standard compression ratio of 1.3 engine?

13.5:1
1.3-liter engine with max 38% thermal efficiency. One of the engines is a 1.3-liter gasoline engine in which Toyota is employing the Atkinson cycle—normally used in dedicated hybrid engines—and a compression ratio of 13.5:1.

What is the highest compression ratio for 93 octane?

We are being told by most piston manufacturers that 9.5:1 is the most you should run in an engine with cast iron heads on 93 octane pump gas. Because aluminum conducts (dissipates to the cooling system) heat much faster than cast iron does, you can run 10.5:1 with aluminum heads on 93 octane.

What is the highest compression ratio for 87 octane?

Generally, engines with compression ratios of 9.3 : 1 or less will safely operate with unleaded 87 octane fuel. Engines with higher compression ratios usually require higher octane fuels.

What is the compression ratio for 91 octane?

The generally accepted conservative estimate is 8.0 to perhaps 8.5:1 dynamic compression ratio for 91 octane pump gas. This tends to be true for older, traditional engines with less effective combustion chambers. But for later model engines with better chambers, that could be improved to 9.0:1 dynamic.

Why diesel engine has more compression ratio?

Diesel engines use higher compression ratios than petrol engines, because the lack of a spark plug means that the compression ratio must increase the temperature of the air in the cylinder sufficiently to ignite the diesel using compression ignition.

What octane is needed for 9.5 compression?

The standard recommendation for street engines running on pump gas has always been to shoot for a 9.0:1 to perhaps 9.5:1 compression ratio. This is in order for the engine to safely work with pump gas, which for much of the country, is limited to 91-octane.

What octane is needed for 9.5 to 1 compression?