Thread: Octane Change
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Old 02-18-2012, 12:10 PM
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mikeg205 mikeg205 is offline
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Boat: 1995 Pro Star 205 5.7 Liter
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Premium gas 91-93 burns more in a more controlled manner - 87 octane can detonate in the compression stroke of a piston which can cause engine knock and piston/cylinder damage. I don't know how the 85 351W controls engine timing. Newer cars will detect ping/engine knock via a sensor and adjust timing to eliminate ping/knock.

If you made it to 1960 hours what is making you want change the fuel octane? Higher octane fuels are for higher compression engines... hence racing fuel aviation fuel....

+1 on Cant' repeat's advice.
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