![]() We like to mix blue food coloring into the alcohol to make the fluid easier to see. Next you will need some rubbing alcohol as the test fluid. Rotate your engine stand to position that hole in the plate as the highest point. Now place some light grease on the flat plastic plate and position it over the cylinder with the small hole near the upper edge of the cylinder. Then turn the crank to position the piston exactly 0.100 inch below the deck surface. The next step is to run the piston down the bore about an inch or so and lightly coat the cylinder wall with a thin film of grease to seal the rings. This is the volume of the cylinder with a perfectly flat top piston that is 0.100 inch down in the bore. One Cubic inch = 16.38 cubic centimeters, so 1.2756 x 16.38 = 20.9cc, which we’ll round off to 21cc. Volume of Cylinder = 1.2756 cubic inches.Volume of Cylinder = Pi x Radius x Radius x Height.We will calculate the volume of a cylinder that will be produced in cubic inches and then convert to cubic centimeters. Let’s say that the bore is 4.030 inches and the piston is 0.100 inch down in the bore. You can choose any distance you want but don’t go too far down in the hole or you will exceed the cubic centimeter (cc) volume of the beaker which just over-complicates this process.įirst let’s determine the volume of the cylinder. Let’s start by assuming the piston is exactly 0.100 inch down from the deck. We need to compute this volume in order to compare it with the volume of the dish in the piston. In order to determine the volume of the dish in the piston, we will need to first determine the volume of the cylinder at a given depth. ![]() (Image/Summit Racing) Calculating Cylinder Volume This kit can also be used to check volume with the piston in place as we’ve described in the answer. I think I paid over $100 for one of these about 40 years ago-now, you can find a complete beaker and chamber plate kit from Summit Racing for around $30 that has everything you need all in one kit! This Summit Racing cylinder head cc kit is just a bit more than $30 and offers a 100cc graduated beaker and the plastic plate needed to cover the chamber. ![]() In the old days, measuring combustion chamber or piston volume required an expensive, laboratory grade 100cc graduated cylinder and a dedicated metal stand and clamp. Can you help? A.T.įiguring out the compression ratio is actually a fairly easy procedure and with today’s inexpensive tools, you can perform the entire process is a few minutes. I’d like to figure out what the compression ratio is with a set of iron 64cc cylinder heads but I’m at a loss since I don’t know anything about the pistons. I have a 355ci small block Chevy that I bought that has dished pistons but I don’t know anything about them. ![]()
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