So @pnora was correct back on page 1.Not sure I want to get involved in this fray, but the OP did not specify whether the racing fuel was leaded or not.
Back in the day, when I actually worked for Suncor (Canadian Sunoco), we did all of the different blends with pump unleaded, av gas and race gas. All were verified in the Waukeshaw knock engines in the lab. If the race fuel in question is unleaded, the straight ratio math formula can be used. If it is leaded race fuel, it is not that simple.
Published you say? Got a link?It's been well known that adding lead increases octane. It was a popular trick in the 1970s, with published tests showing the improvements, to mix unleaded and leaded gas. A 50/50 mix of regular leaded and regular unleaded resulted in higher octane than either on their own, due to the 'kick' of the lead being added to the unleaded. It was not logarithmic; the unleaded gained more octane than the leaded would than either on their own would
So just go away then, if you have nothing of worth to share.All this discussion (crap), is worthless to me. I'm just doing what works for my cars. You have beat this horse to death.
I added my thoughts 2 different times on this subject, but you choose to ignore it, therfore I could care less. Do what you will. There are people on this forum that like good advice and then there's you. Buzz off.
Now I need to justify no response on my part because your feelings are hurt because I chose to not reply to your first response of stating the obvious, that did not address the OP's initial question directly of determining blended octanes?I added my thoughts 2 different times on this subject, but you choose to ignore it, therfore I could care less. Do what you will. There are people on this forum that like good advice and then there's you. Buzz off.
It wasn't "without any reason", it was based on what mrhemi said "back in the day, when I actually worked for Suncor (Canadian Sunoco), we did all of the different blends with pump unleaded, av gas and race gas. All were verified in the Waukeshaw knock engines in the lab. If the race fuel in question is unleaded, the straight ratio math formula can be used. If it is leaded race fuel, it is not that simple.I support your right to believe anything for or without any reason.
I also believe ignorance is bliss still remains true.
NotedIt wasn't "without any reason", it was based on what mrhemi said "back in the day, when I actually worked for Suncor (Canadian Sunoco), we did all of the different blends with pump unleaded, av gas and race gas. All were verified in the Waukeshaw knock engines in the lab. If the race fuel in question is unleaded, the straight ratio math formula can be used. If it is leaded race fuel, it is not that simple.
Which is what pnora said on page 1.
You're an argumentative ******* prick, which I believe you get off on, stirring people up on the internet.
No, I didn't see it online. I had it in a magazine article but no idea where it is now.Published you say? Got a link?
Fred looks surprised.As others have posted, just find a station (better yet, a network of stations in your area) that offer ethanol-free gas.
Preferably 93 alky-free.
Adjust timing so it just barely doesn't detonate (knock) on it and you're golden - but that "alcohol-free" part matters
more than you'd think.
Here locally, the difference between the 93 ethanol blend and 93 no alky is readily apparent in Fred; he runs noticeably
better on the no-alky stuff and gets further on a gallon, too.
(Hint: Check with the closest Co-op; they sometimes offer alcohol-free).
BTW, this is "Fred" on the good stuff:
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