Compression Lesson

Aug_13_SI_Cov1-WebAn engine’s compression ratio has a direct effect on it’s on-track performance, according to Dick Boyer of PMB Performance Products. 

“If  you pay attention, you’ll see it nose over at the end of the straightaway,” says Boyer. “The engine won’t accelerate any faster—it’s a classic symptom of insufficient compression.”

Selecting the compression ratio for a race engine is often influenced by the cylinder-head material: cast iron or aluminum. Aluminum heads dissipate heat faster than their cast-iron counterparts, thus on a specific fuel they permit higher compression ratios without detonation. 

Read the entire story in the August 2013 issue of Speedway Illustrated by clicking the image below.

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