Valve lag?

2003 HOLDEN RODEO
350,000 MILES • 3.5L • 6 CYL • 2WD • AUTOMATIC
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SCOTTY007
  • MEMBER
  • 1 POST
Hi, I am doing the valve timing on the cars twin cams. I need to ask should all valves be close at TDC or does number one exhaust valves remain open slightly as the intake opens to scavange any remaining gases. thank you.
Jul 15, 2023 at 3:37 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
When the piston is at TDC, either you have an exhaust stroke or combustion stroke. If you turn the crankshaft 360 degrees, does the same thing happen?

Let me know.

Joe
Jul 16, 2023 at 1:33 PM
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