![]() Furthermore, to be prepared for the very high effective net engine compression that results when the turbo comes on fully, the engine must have an inherently low compression ratio such as 8:1, which further takes away power before the turbo is up. This gives maximum power when the turbocharger is spooled up beyond 3000 rpm, but below that engine speed the turbo will slow the engine down as it is exhaust driven. It is for this reason that only higher octanes are usable in modern engines, because lower octanes like 92 are more prone to knocking.Ģ. The fuel will start burning spontaneously (before the spark plug ignites) and this causes knocking (which is a flame front coming down at the piston trying to go upwards), and this reduces engine power. ![]() However, since the air and fuel are both more highly compressed, there will be more heat. By changing the flat-top pistons to high compression ones that curve upward to result in a higher compression ratio. Higher compression is normally achieved in a few ways:ġ. SITE MAP (below) How To Improve Engine Compression ![]()
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