Search results
4 lut 2022 · I was running at 10.94 to 1 with aluminum heads in my 440/493 and had to run 104 octane to be free of detonation. I changed to thicker head gaskets which brought the compression down to 10.07 to 1. I can run 91 octane without knocking even in 110 degree heat.
20 lis 2022 · Use the standard compression ratio fuel octane chart to know the fuel suitable for your engine. Use low-octane rating gas for engines with a low-compression ratio. For engines with a high-compression ratio, use a premium or super-rated fuel.
To determine octane to your compression, follow our easy to use chart below. To help determine compression if you have forced induction (supercharger, turbocharger, or procharger) follow the chart below. Using the BOOSTane app to determine your needs.
It's easy to find what octane rating a gas has: Stations are required to post them on bright yellow stickers on each pump. Click ahead to discover what compression ratio is and how an engine can alert you to knocking and pinging.
10 sty 2010 · Effective Compression Ratio (ECR) = [(Boost / 14.7) +1] x Static Compression Ratio Let’s plug in our 10:1 compression engine with a psi of boost into this equation: ECR = [(8 psi / 14.7) +1] x 10 ECR = 15.4:1 This reveals our engine was running an effective compression ratio of over 15:1.
A. Most places that sell gasoline offer three octane grades of unleaded gasoline–regular at 87 (R+M)/2, midgrade at 89 (R+M)/2, and premium at 93 (R+M)/2. In high-altitude areas such as the Rocky Mountain Region of the U.S., the (R+M)/2 number may be lower by one or two numbers.
31 lip 2002 · On the high compression side, you will find 4.06 bore by .040, and then on the low compression side you will find 4.10 by .060. This choice will greatly effect your final CR. There are a lot of compression calculators online, but the best one I have found so far is
