The only research I have done is by experience and adding it to my fuel. The engine pings like a bitch at cruising speed when it's hot out, it has considerably less ping after the boost is added. Got tired of chasing and paying for a good tune. I have had the bike tuned 3 times at 2 different dealers. Right now I would rather ride it until I find the time to locate a good shop in my area where they know how to run a dyno. Until then, when it starts pinging, I add boost and it's quiet.

 

Actually, the compression ratio is a physical non-changing thing. Because the air is less dense at altitude, there is less to pack into the cylinder so the compression reading may drop (handheld products drop approximately 3.5 PSI on the gauge for every 1,000 feet rise in altitude.), but the physical ratio remains the same.

That is why when bikes were carbureted, many at altitude were fine with stock jetting but their counterparts at sea lever were not.

 

+1 on the Lucas. Good stuff. Wouldn’t hurt to get some and carry it with you just in case. Chances are you’ll be fine. If it starts pinging pour some Lucas in the tank. Otherwise don’t worry about it. My previous bike (2011 Road Glide Ultra) was extremely sensitive to fuel. I carried a bottle of Lucas with me all the time because I never knew when it would start pinging. The Lucas always fixed it. The 17 Heritage I ride now doesn’t have that problem. I’m pretty sure it would run on kerosene if I could get it to fire off. Bottom line, if it ain’t pinging it’s fine. If it starts pinging give it a little octane boost. If that doesn’t fix it come home.

 

Chevron 91 and sometimes higher if I feel the urge to spend foolishly.
Formerly riding an 02 Ultra 95, SE203 cams and tru duals...
Now running a stock 2011 103 Road Glide Ultra and it too will get the same fuel treatment.
Rob

 

Just follow the manual with the recommended octane fuel....I don't get it. IF it's about cost then consider this, fuel is the cheapest part of owning a motorcycle. Even if you manage to ride 20,000 miles a year and get 40 miles per gallon and you pay $4 a gallon (an extremely high price as an example) fuel will ONLY cost you $2,000 a year. Using a lower octane (ie: less costly fuel) at, let say $1 less per gallon would only save $500/yr...........what's the point?......USE WHAT'S RECOMMENDED.....nuff said!

 

What is recommended for my pumped up 1994 Evo with 10 .75 CR?
All you guys run plain jane stock engines?

 

same here big difference in ping over a few different baggers. get to know your ride when it pings your too hot or octane is too low or your tune is more for preformance then rideability. i can get 93 corn or 91 noncorn ill take the noncorn anyday.