Practice Day

Yesterday I spent the day down the track,

The results were;

Bad pinking on large throttle openings ( eg 2nd gear out of a sharp corner )
rich up to 1/4 throttle opening , slightly lean mid throttle and lean top end . its in the ballpark so not worried about that.
Heat causing excessive rocker block clearance , as discussed oil viscosity through those bearings . need to stop heat transfer into rocker block.
front Suspension , in the last part of its travel is too soft allowing fender to contact the frame .
Plug tip timing band ( the little bit at the top of the electrode ) is grey and 1mm wide
Gear changing is still difficult , its going PAST the gear needed , ie from second to third , I go past second into no mans land between 2nd and third . ( simple fix is RHS shift , but I want to use the left )
Clutch is STILL a might heavy for MX use ( The bench mark is the 2007 CR Range ) two finger use !!
The balance is good , it lands well of a jump and the suspension is surprisingly ok !
Now to clean and disassemble and Check !

Stephen

updated ignition timing

17 deg at 1000 rpm

38 deg at 2040 rpm

Stephen

dynamic ignition timing

Just measured the ignition timing at 16 degrees BTDC at 1060 rpm I will try and get an ignition curve later on in the week

This is with stock Indian springs

and the oil seal is leaking slightly ......poo

Stephen

Valve deflection

well trying to go through the process of using FEA to solve cad drawings for Stress strain and deflections
This means I can conceptualize an Idea run it and check then send straight to rapid prototyper/ water cutting or Machine shops
I am using CAELINUX ( Salome post processor, ASTK solver ), while this is free open source , its in french . I dont speak french!!!

Still I ve managed to, model the piston and a valve. So I can now epand on the idea.

Stephen

FEA 1

Finally got a FEA package to easily ???? run a script. Using a tutorial I managed to load, mesh , solve and display a piston. Now I know How , and the pitfalls , I can start modelling other parts such as a foot peg bracket
A couple of minor question remain but they are solvable

Stephen

Clutch cable system total flex 1,8mm
Clutch pushrod flex 0.3mm
Cable flex 1.5mm

Stephen

5.11.07 Clutch. carb

Bike up on Bench
float hieght reset 25mm ( its quite tricky , to little , lean , to much , flooding and only a few mm either way !

Clutch Spring info

free length 27.15mm
Clash 2.86mm
wire dia 2.38mm
End constant 1.5
Number of active coils 4.5

Pressure plate lift 0.8mm
actuator arm lift ( measured at adjusting screw ) 1.10mm
flex of clutch pushrod 0.3mm
clutch lever lift 43mm ( not enough )

Stephen

Thus it begins

Well I well use this blog to keep people informed of the Enfield and its continuing dramas

Stephen