How to Degree a Cam: Considerations for V or Horizontally Opposed Overhead Cam Engines
Considerations for V or Horizontally Opposed Overhead Cam Engines
- If you're dealing with an engine with a V configuration such as a V6 or V8, or alternatively a horizontally opposed engine with single or double overhead cams, then the process of degreeing the cams requires a little more work.
Now we will need to degree both banks of camshafts as they're actuated independently.
While this adds time to the process, really it's not any more difficult and is simply a rinse and repeat of the process that we've already discussed.
In this instance we would start on the bank of cylinders that includes number one cylinder.
We would then degree the cam or cams on this bank of cylinders as described in the six step process.
This will have the cam timing events correct for this bank of cylinders, and following this we'd need to do the exact same process on the opposite bank.
This does however require us to reset our degree wheel to find TDC on the front cylinder of the opposite bank of cylinders.
From here we're just going to repeat the same process that we've gone through on the first bank of cylinders.
While it's always important to be accurate with your cam timing, this is especially important for V and horizontally opposed engines since a discrepancy in cam timing from one bank to the other may have a significant effect on the engine's volumetric efficiency bank to bank which can result in bank to bank fluctuations in air fuel ratio as well as a detrimental effect on engine performance.