[Editor’s Note: This article originally ran in the October 2008 issue of Grassroots Motorsports, but we felt the method for measuring compression ratios was worth mentioning again.]
Once you’ve finished building an engine, the bombardment of questions soon follows: What camshaft did you use? How much power do you think it makes? Why is it leaking oil already? Unfortunately, you might not know the answer to one of the most important questions of all: What is your engine’s compression ratio?
Why is knowing the compression ratio of your engine important? The engine is a system, and being well-versed in the system is vital when it comes to making decisions concerning your car. The compression ratio is an absolutely key ingredient to the system. It will tell you what types of performance upgrades you will be able to install down the road—like whether or not it can handle a supercharger or turbo. It’s also important to have your compression ratio matched…
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