|08-24-2008 11:52 AM|
Last Monday I had a similar experience. I filled up with Exxon REAL GAS and the engine pings horrible.
This engine rarely pings.. maybe 5 tanks in 15 years.
Some of the "real gas" is just pretty junky stuff even from a major supplier.
I think they sometimes dump a bunch of 87 into the 93 tanker.
No, octane booster won't help.
I had good luck in the mid 80's with the '70 350/350 11/1 compression by running Holley water injection with a 8" vacuum on-switch, but had just a little transition ping and I always though I needed a 10" switch.
Used a gallon of water every 120 miles but was easily driveable.
I have friends who have tried 1/2 AVgas. Sometimes it is enough to do the job, but it will run a tad richer as avgas is 10% lighter than car gas.= and the price is outrageous too..... $ 6 plus I hear.
|08-24-2008 09:10 AM|
I took the vette (427/390) out for a drive yesterday. I had filled the car with Non-Oxygenated fuel for the drive. Stepped on the accelerator and got severe pinging. I know some of you are running the 468/502's so what fuel do you use in these engines? Is your compression less than the older BB's?
My engine is not built. I has the standard 10:1 compression ratio. A little hotter cam than factory but not outlandish. The heads are stock with hardened valve seats in them. The timing is at (or should be) 6 degrees. I am looking at possibly buying some VP and adding an couple of gallons to each tank full to get the damn thing to run without pinging. Any help is appreciated.