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Octane level and compression 140-160

posted by  JohnH on  Mon Aug 18 03:11 CST 2014
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last visit: Mon Oct 6 00:29 CST 2014
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Hi,

Another question as we prepare for the Trans Am. What maximum compression ratio will USA and Canadian fuels support, assuming we use the highest octane fuels available?

I think the highest I've noticed in CO is 89: do the octane numbers increase as you approach sea level? Will 89 in CO support a 10.5:1 compression, or more? The maximum altitude we expect to see on the rally is 8500ft.

Also, we'll be almost certainly using 2 x 45DCOE Webers. Will I need to rejet for the higher altitudes if the carbs have been set up at, say, 3000ft?

Regards
--
JohnH, Sydney, Australia






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New Octane level and compression [140-160]
posted by  JohnH  on Mon Aug 18 03:11 CST 2014 >


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