Posted by dhermesc on October 30, 2007 at 09:10:04 from (24.248.193.103):
In Reply to: what octane gas to run? posted by new 560 owner in ks on October 29, 2007 at 10:04:19:
From another thread:
The IH manual for my 404 says - This engine is designed to operate on gasoline with a 93 minimum Octane rating ( Research Method ).
The key being "Research Method". The Research Method octane rating is not what you see on the pump these days. What you see on the pump is a combination of Research and Motor octane ratings and will be 4 or 5 points lower than the numbers shown using just the Research Method.
IOW, 89 as shown on the pump these days will be about 93-94 Research Method octane. It makes sense that these 70's and older engines would run on current 89 octane rating fuel given their low compression and low rpm operation.
Some links about fuel octane that include more links -
To summerize, 87 octane today is the equivilent of 91-92 Octane in 1970.
Unless you are running more than 8.5 to 1 compression you don't need to run higher octane (+87) to prevent predetonation even with older ignition set ups. If you are having a predetonation problem your issue is not with you fuel.
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