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Thread: Mixing fuel to get 93 octane
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10-02-2013, 07:50 AM #31
I was told by a former racer of stock obs that leaded fuel was usually good for up to 200 rpm on the top end over unleaded. Could this have a bearing on Mercs recomendations? Gary
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10-02-2013, 05:04 PM #32
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10-02-2013, 07:15 PM #33
Mark75H I agee with you but why does Merc say "leaded or unleaded" recommended for some of their motors? Thanks Gary
Last edited by olboatman; 10-02-2013 at 07:19 PM.
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10-03-2013, 05:50 PM #34
Just to say they felt the lead or not was less important than the octane rating
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10-03-2013, 07:55 PM #35
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10-04-2013, 01:40 AM #36
Here is what need to you know:
1. Stay away from leaded gasoline. It is one of the most disastrous inventions by mankind.
2. Below 7500 rpm, 40:1. Above 7500 rpm 32:1. The reason is that the fuel curve gets very lean up there, so you need more oil in the fuel to get the same amount of oil per revolutionLast edited by Markus; 10-04-2013 at 03:13 AM.
Markus' Performance Boating Links:
www.toastedmarshmallow.com/performance
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10-04-2013, 06:15 AM #37
Your right on the 100LL.The Merc catalog from 79 list 100oct LL aviation as the preferred fuel for the race motors.And that was at a time when there was a good supply of 93 non eathanol around.And Markus you may be wrong about the lead,My wife says that single malt scotch,is the worst thing developed by mankind