I have used that octane booster added to a tank of regular many times, but after I finally thought about the price of the booster vs just buying high test gas I decided there was no savings. I guess if you had higher than 11:1 you could add it to high test and be ok. It does work.

 

Octane booster is CRAP. It says it raises the octane by as much as 4 points. It's true, it does: Four POINTS as in .4 , that to me is a complete waste of $ and it wont make that much difference. There's no way you were adding a three dollar bottle of stuff and going from 87 to 93.....If that was the case, they wouldn't be able to keep it on the shelves.

 

Flat tops or pop ups will increase your ratio, but may hinder complete burn of your mixture. One manufacturer sells dished ones specifically for that reason, Kieth Black Silvolite...check out their write up on this.

 

So, it is snake oil like most additives, huh? I have never been a believer in additives except lead additives to the gas for my old soft valved seats to keep them from burning. I know a lot of guys who say that just buying 93 octane gas will take care of that, but 93 octane gas doesn't replace the leaded gas that used to be used in my original 289. By studying lead additives, I found that a very small amount of NCA is introduced to the gas to cushion the soft valve seats. Whether or not is actually does or not, I am taking no chances. I use the highest octane gas I can buy plus the lead additive. So there.....I've made up my mind, and I'm sticking to it.

 

Lead made the octane go up. I don't know how, but it did. Just something I seen on TV.

 

Didn't the lead slow the burn of the gas? I think as you said the lead by itself boosted the octane rating.

 

Higher octane gas does burn slower than lower octane. The higher octane fuel is more stable so it can be compressed to a higher pressure where as a lower octane might ignite just from the pressure.