Quote originally posted by Sledneck26
What is a compression ratio? stroke volume at bottom of stroke to volume at top dead center?
Yes, cylinder volume to be more specific. If you have a 13:1 compression ratio, the volume of the cylinder at bottom dead center is 13 times greater than the volume of the cylinder at top dead center.
Quote originally posted by Sledneck26
Also. My sled is sopposed to run a minimum of 87octane. And yet some sleds say minimum of like 90.
Does this mean that my squish or compression is lower on my sled than some other sleds?
In a nutshell, yes. There are other factors that affect what octane fuel your engine requires, such as timing, but basically, if you have a higher compression ratio, you will need higher octane fuel.
If your sled (or car, or whatever) has an engine management computer, you can get away with running lower octane than what it requires. The computer is capable of changing the timing to compensate for the lower octane fuel. I wouldn't recommend going that route on a contiuous basis, but in a pinch, it'll get you to the gas station, or home.
Quote originally posted by Sledneck26
Anyone know how much i could shave on my sled to have a savfe squish but not run race gas?
From my experience, shaving the head isn't something you can just look up in a table, do it, and get results. There are many other factors involved with increasing your compression ratio, and the best thing you can do is find someone that has more years of experience than you've been alive, and get on their good side. Knowledge is key with those types of projects.
