Vacuum Advance Combustion Chamber Photo

Vacuum Advance Combustion Chamber

Advancing Opportunity - Effects of Vacuum Advance on Pontiac Engines

We tapped into the ECM of our '01 Trans Am to see if tuning practices had changed with current technology and emissions regulations. Using an OBD-II-compatible diagnostic-scan tool, we found that at normal operating conditions, our LS1 idled with 22 degrees of advance, and it peaked at 38 degrees at part throttle. Consider that the cylinder heads of these engines are designed for the quickest possible burn, as you can see in this LS1 chamber shot with its heart-shape and spark plug biased toward the exhaust valve, among other features. As a result, maximum full-throttle performance requires just 28-30 degrees of advance. View Related Article

Pontiac Solstice Research

Get updated on all your car buying needs from safety features, to specs, to crash test ratings and options. Get all the information you need if you are interested in buying a new car like the Pontiac Solstice. The L4 standard engine in the Solstice gives you 173 horsepower with an estimated 22 mpg. It has a comparable trade in value which should come in handy when you go to shop for your next car. The Pontiac Torrent and the Pontiac G6 are other vehicles that might interest you.