Ref Period oscillating at High RPM under load - Help
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From: Canada
Car: '18 Chev Camaro SS 1LE
Engine: LT1 6.2L
Transmission: T56
Axle/Gears: 3.91
Ref Period oscillating at High RPM under load - Help
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Last edited by SbFormula; Feb 15, 2025 at 06:20 AM.
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From: Browns Town
Car: 86 Monte SS (730,$8D,G3,AP,4K,S_V4)
Engine: 406 Hyd Roller 236/242
Transmission: 700R4 HomeBrew, 2.4K stall
Axle/Gears: 3:73 Posi, 7.5 Soon to break
Re: Ref Period oscillating at High RPM under load - Help
Could be crankshaft resonance propagating to the cam drive and through distributor gear.
since it appears to repeat at the high speed and load areas, the tolerances of the timing chain, distributor gear may be showing. Heavy power stroke pulses bouncing the chain?
long shot but tossing ideas,
oil pump relief bouncing may also load/unload the distributor shaft just enough to cause a fluttering that only shows in between power strokes.
Would be good to track over time to see if the amplitude of the oscillation increase to show wear.
Jp
since it appears to repeat at the high speed and load areas, the tolerances of the timing chain, distributor gear may be showing. Heavy power stroke pulses bouncing the chain?
long shot but tossing ideas,
oil pump relief bouncing may also load/unload the distributor shaft just enough to cause a fluttering that only shows in between power strokes.
Would be good to track over time to see if the amplitude of the oscillation increase to show wear.
Jp
Thread Starter
Supreme Member
Joined: Jun 2012
Posts: 1,367
Likes: 193
From: Canada
Car: '18 Chev Camaro SS 1LE
Engine: LT1 6.2L
Transmission: T56
Axle/Gears: 3.91
Re: Ref Period oscillating at High RPM under load - Help
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Last edited by SbFormula; Feb 15, 2025 at 06:21 AM.
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