Motored cylinder head
Measure valve lift using optical instrumentation outside the cylinder head. Assess the mechanical and kinematic behaviour of a valve-train design or individual component prototypes.
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VALVE DYNAMICS
Understand valve dynamics — from valve lift to seating behaviour.
Valve lift, velocity and acceleration help explain how a valve opens and closes. ROTEC combines measurement technology with RAS software analysis for tests on motored cylinder heads and fired engines.
Compare actual valve motion with the design
A kinematic lift curve alone does not describe the dynamic behaviour of a valve train. Opening and closing timing, loss of lift, valve float, bounce and seating velocity also matter. Tests on a fired engine can include the effects of actual oil and temperature conditions and torsional vibration.
- How does valve motion change with engine speed?
- Where does the measured lift profile differ from the kinematic reference?
- How do the timing drive and torsional vibration affect valve dynamics?
Two methods. Different test conditions.
Fired engine
Integrated magnetoresistive sensors at the valve guide measure valve lift in a near-production engine. Investigate timing and valve dynamics under actual oil and temperature conditions, including the engine’s torsional vibration behaviour.
From the test question to the analysis
1. Choose the measurement method
Select optical measurement on a motored cylinder head or integrated magnetoresistive sensing on a fired engine to suit the test objective.
2. Capture lift and angular position
Relate valve lift to crankshaft or camshaft position. GMR sensors provide analogue sine and cosine signals; signal conditioning and acquisition must match this signal path.
3. Include additional signals
Depending on the test setup, include simultaneously measured spring and cam forces or rotational speed signals.
4. Evaluate valve cycles
The RAS valve-train software module supports automated analysis at constant speeds and during speed ramps, with results plotted against speed, rotational angle and time.
Analyse valve motion in context
The RAS valve-train software module supports automated analysis at constant speeds and during speed ramps. Plots against speed, rotational angle and time help engineers compare operating points and valve cycles.
A setup for your test
Match the measurement method and sensor integration to the cylinder head, engine and test objective.
Application-specific analysis
Investigate valve lift, velocity and acceleration alongside opening intervals, loss of lift, overlap, valve float, bounce and seating velocity.
Traceable results
Present measurement curves and characteristic values in 2D and 3D plots. Document the cycles selected for analysis and the criteria used when assessing results.
Plan the test around your objective
Motored cylinder head
Assess the mechanical and kinematic behaviour of a valve-train design or individual component prototypes.
Fired engine
Validate timing and valve dynamics in a near-production engine with actual oil and temperature conditions.
Variable valve timing
Compare dynamic parameters across operating points and speed ramps.
Valve dynamics: your questions
How do the two measurement methods differ?
Optical measurement on a motored cylinder head takes place outside the cylinder head. Integrated magnetoresistive sensors enable lift measurements on a fired engine. The appropriate method depends on the test objective and sensor integration.
Which quantities can the software analyse?
These include lift, velocity, acceleration, opening intervals, loss of lift, valve overlap, valve float, bounce and seating velocity. The analysis is configured to match the available signals.
Can speed ramps be analysed?
Yes. The RAS valve-train software module supports measurements at constant speeds and during speed ramps.
How would you like to validate your valve train?
Tell us about your test assembly, speed range and the valve parameters that matter. We can then discuss the measurement method and analyses required.
Explore the measurement system
VALVE DYNAMICS
Understand valve dynamics — from valve lift to seating behaviour.
Valve lift, velocity and acceleration help explain how a valve opens and closes. ROTEC combines measurement technology with RAS software analysis for tests on motored cylinder heads and fired engines.
Compare actual valve motion with the design
A kinematic lift curve alone does not describe the dynamic behaviour of a valve train. Opening and closing timing, loss of lift, valve float, bounce and seating velocity also matter. Tests on a fired engine can include the effects of actual oil and temperature conditions and torsional vibration.
- How does valve motion change with engine speed?
- Where does the measured lift profile differ from the kinematic reference?
- How do the timing drive and torsional vibration affect valve dynamics?
Two methods. Different test conditions.
Motored cylinder head
Measure valve lift using optical instrumentation outside the cylinder head. Assess the mechanical and kinematic behaviour of a valve-train design or individual component prototypes.
Fired engine
Integrated magnetoresistive sensors at the valve guide measure valve lift in a near-production engine. Investigate timing and valve dynamics under actual oil and temperature conditions, including the engine’s torsional vibration behaviour.
From the test question to the analysis
1. Choose the measurement method
Select optical measurement on a motored cylinder head or integrated magnetoresistive sensing on a fired engine to suit the test objective.
2. Capture lift and angular position
Relate valve lift to crankshaft or camshaft position. GMR sensors provide analogue sine and cosine signals; signal conditioning and acquisition must match this signal path.
3. Include additional signals
Depending on the test setup, include simultaneously measured spring and cam forces or rotational speed signals.
4. Evaluate valve cycles
The RAS valve-train software module supports automated analysis at constant speeds and during speed ramps, with results plotted against speed, rotational angle and time.
Analyse valve motion in context
The RAS valve-train software module supports automated analysis at constant speeds and during speed ramps. Plots against speed, rotational angle and time help engineers compare operating points and valve cycles.
A setup for your test
Match the measurement method and sensor integration to the cylinder head, engine and test objective.
Application-specific analysis
Investigate valve lift, velocity and acceleration alongside opening intervals, loss of lift, overlap, valve float, bounce and seating velocity.
Traceable results
Present measurement curves and characteristic values in 2D and 3D plots. Document the cycles selected for analysis and the criteria used when assessing results.
Plan the test around your objective
Motored cylinder head
Assess the mechanical and kinematic behaviour of a valve-train design or individual component prototypes.
Fired engine
Validate timing and valve dynamics in a near-production engine with actual oil and temperature conditions.
Variable valve timing
Compare dynamic parameters across operating points and speed ramps.
Valve dynamics: your questions
How do the two measurement methods differ?
Optical measurement on a motored cylinder head takes place outside the cylinder head. Integrated magnetoresistive sensors enable lift measurements on a fired engine. The appropriate method depends on the test objective and sensor integration.
Which quantities can the software analyse?
These include lift, velocity, acceleration, opening intervals, loss of lift, valve overlap, valve float, bounce and seating velocity. The analysis is configured to match the available signals.
Can speed ramps be analysed?
Yes. The RAS valve-train software module supports measurements at constant speeds and during speed ramps.
How would you like to validate your valve train?
Tell us about your test assembly, speed range and the valve parameters that matter. We can then discuss the measurement method and analyses required.