Which collector type contains a goilet and venturi to transition exhaust gases?

• A. Tri-Y
• B. Merge
• C. Formed
• D. Double-slip

Answer: (B)

Understanding how a collector handles multiple exhaust pulses coming together is what this item tests. A merge collector is built to take exhaust from several primaries and blend them into one outlet. At the junction, it often includes a venturi-like constriction or throat that speeds up the gas and lowers pressure just as the streams combine. This helps pull exhaust from each cylinder into the overall flow, improving scavenging and reducing backpressure. That smooth transition with a dedicated throat is what the description is pointing to.

Other types of collectors shape or arrange the primaries differently to manage pulse timing or fit constraints rather than emphasize a focused transition throat at the merge.