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87oct in 365mag?

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Old 05-21-2008, 09:52 PM
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Default 87oct in 365mag?

I always run at least 89oct in it and 91 or 93 if I know I have to keep up with my buddys on big runs. But with gas now $$$ looking to see if it's ok?
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Old 05-21-2008, 10:35 PM
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I have run 87 in my ScarabIII with no prob but normaly run 89. My Mags are all original with about 400 hours on them. To be honest i cant tell any difference between the two dif. octanes in my boat.
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Old 05-21-2008, 11:30 PM
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The engine is designed to run on 87 octane. If you use higher octane it doesn't burn as fast and as completely and you are actually loosing power. Bump the timing up to 34-35* and then run 89.
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Old 05-21-2008, 11:37 PM
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87oct wot for big runs is ok?
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Old 05-22-2008, 03:30 AM
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Sure, thats what the engine was built for. If you bump up the timing, go with 89 octane.
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Old 05-22-2008, 07:32 AM
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Quote:
Originally Posted by nova26 View Post
87oct wot for big runs is ok?

read the manual, it tells you to run 87 octane.
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Old 05-22-2008, 10:02 AM
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Quote:
Originally Posted by Shameless View Post
read the manual, it tells you to run 87 octane.
Wish I had one, thats why I'm asking.
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Old 05-22-2008, 10:32 PM
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87 in hp500 and it's fine .
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Old 05-23-2008, 07:07 AM
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When I've run 89 I get a sooty transome. 87 runs best.
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Old 05-26-2008, 12:57 AM
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I had a 454 385 mag ran 87 for years. No problems, less soot.

Do it.
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