Avoiding Pinging with 91 Octane California Gas

Ron61 · #1 (**permalink**) 11-27-2015, 11:53 AM

I too use the racing gas in one of my cars. I had the compression lowered from 12.5 to 10 but it still pinged. I live in Northern Calif. and we can't get the Sunoco gas up here at all, but Union 76, Shell, and Chevron seem to be the best.

Ron

jhv48 · #2 (**permalink**) 11-27-2015, 01:09 PM

I ran 18/38 degrees advance on my 302ci engine with California 91 octane gas with no problems. Compression was also 10-1.

My last 427 sbf ran 16-36 degrees with 10.5-1 compression on 91 octane California pump gas. No problems there either.

Does your original setup ping when you use 91? If not, don't change anything and run it.

jhirasak · #3 (**permalink**) 11-27-2015, 06:19 PM

JHV48

My engine ran without pinging while using 93 octane gas but now that I live in California, I am having trouble with pinging while using the available 91 octane Shell premium gas. As per comments to my questions, I will try some of the other recommended brands of premium pump gas to see if they will perform satisfactorly without the need of octane booster addition.

Thanks to all of you who responded to my questions.

Cheers,

John