Re: octane rating(+) - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: octane rating(+)
Posted by Dean (more from Dean) on Sat, 15 Jan 2005 17:14:13
In Reply to: octane rating(+), Den, Sat, 15 Jan 2005 14:28:16
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You have a 10.5 compression ratio. The engine tuning will be less agressive on low octane and power will be reduced. Combustion chamber deposits create hot spots that increase the octane demand of the engine.
The octane demands of an engine also change with the barometric pressure and altitude, among other things. So there is no 'one answer'.
Higher octane fuels will yield more power. Clean injectors and combustion chambers with Techron Concentrate. A K&N 33-2663 air filter will improve torque at higher RPMs. A 3" duct mod would also do that, but will also generate induction noise.
This engine design is not forgiving of crappy oil or neglected changes.
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