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Discussion Starter · #1 ·
Hi all, so we're leaving to ride in Colorado on Friday and are taking my little stomper '05 440 as a back up. I bought 16.2CR domes for it from another member on doo talk. They require 110-114 octane near sea level. Does anyone have any experience/knowledge on what the minimum octane requirement would be at 10,000ft? We're thinking a 50/50 mix of 110/93, but are really just guessing. Thanks!
 

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At roughly 3% loss every 1000ft in elevation, you would have about 30% less squeeze at 10,000ft. That would take you from 16.2/1, to about 11.5/1, so for safety round up to 12/1, and fuel for that, with a bit of cushion. 91 would likely be fine, but the famous tuner Djm would add 10 % race fuel, so mix something with higher octane.
 

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Discussion Starter · #6 ·
I guess it would be better to say 6,000ft+. Using the same reasoning as zxmodv we calculated that 93 octane should be safe, but that didn't seem right to us so we thought maybe a 50/50 mix to be safe. And like hqsummit said, that's 93 ocatane at the top of the hill, so perhaps 50/50 would be the way to go.
 

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Wish that was an option everywhere.
There's places I ride where the parking lot is just over 2000' but the riding goes up to +8500'
 

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Exactly, it's the trail that's gonna eat that thing. You could run 50/50 and probably be safe, but just gotta watch yourself on the trail up.
 

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Discussion Starter · #10 ·
50/50 it is. I'm real anxious to see how that little 440 performs out in the steep and deep! Should be a blast
 
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