04-04-2019, 06:10 PM
Hi Folks,
I seem to recall that it is the torsional twisting on the bent wire crank that causes problems.
As you rev the engine you wind the crank in one direction when you un-rev it it tries to twist the other way, hit the harmonics then say goodbye to bent wire.
As well as the twisting you get bending in the unsupported middle.
(Think of a skipping rope that is going round then twisted into a helix , then try and change direction of the helix )
When you drive under load the twist remains more constant and is only being unwound on over run which again is normally a steady state.
You will always get the pulsing due to the firing order.
I seem to recall that it is the torsional twisting on the bent wire crank that causes problems.
As you rev the engine you wind the crank in one direction when you un-rev it it tries to twist the other way, hit the harmonics then say goodbye to bent wire.
As well as the twisting you get bending in the unsupported middle.
(Think of a skipping rope that is going round then twisted into a helix , then try and change direction of the helix )
When you drive under load the twist remains more constant and is only being unwound on over run which again is normally a steady state.
You will always get the pulsing due to the firing order.