Bench testing the engine
28/09/15 01:20
It is now late September in 2015, and Brian's engine is finally getting it first run in after the exhaust valve failure in mid 2013.
What a journey it has been to get this far, and there is a short video clip of it running on the original and carburettor pre failure on the stand, with no exhausts fitted.
Yes, it's idling a little fast, but everything is going round! :)
First start
This is a temporary oil light feed to check everything is working OK. Engine cranking introduces a flicker, but once the revs pick up, the oil light goes out at idle very comfortably, and this is with a standard, but enhanced pump, new oil light piston, plus revised crankshaft lubrication, and it's a measure of how improved the circuit is.
Oil Light Test
I had to add some downpipes to avoid getting fumes blowing into the work area, and also take the noise down bit, whilst I looked at other stuff. The first phase was to run the engine up standard, then convert the ignition over to the programmable system, and then establish a default curve that mimicked the original ignition. Later modify this, and tune the MAP sensor settings to enhance the pick up and drivability off idle. Later still double check the rev limiter is functioning, and using the built in diagnostics that all the sensors and toothed wheel settings are not causing any glitches.
This first thing I noticed was the idle was slightly erratic, and would settle at different rpms when opening the throttle slightly. It turned out the spindle wears directly in the zinc body, and unlike Weber carburettors they do not run in bearings, and have any seals either. Here is a short clip, showing the revs fluctuation as you apply pressure top the spindle.
Throttle Spindle Play
What a journey it has been to get this far, and there is a short video clip of it running on the original and carburettor pre failure on the stand, with no exhausts fitted.
Yes, it's idling a little fast, but everything is going round! :)
First start
This is a temporary oil light feed to check everything is working OK. Engine cranking introduces a flicker, but once the revs pick up, the oil light goes out at idle very comfortably, and this is with a standard, but enhanced pump, new oil light piston, plus revised crankshaft lubrication, and it's a measure of how improved the circuit is.
Oil Light Test
I had to add some downpipes to avoid getting fumes blowing into the work area, and also take the noise down bit, whilst I looked at other stuff. The first phase was to run the engine up standard, then convert the ignition over to the programmable system, and then establish a default curve that mimicked the original ignition. Later modify this, and tune the MAP sensor settings to enhance the pick up and drivability off idle. Later still double check the rev limiter is functioning, and using the built in diagnostics that all the sensors and toothed wheel settings are not causing any glitches.
This first thing I noticed was the idle was slightly erratic, and would settle at different rpms when opening the throttle slightly. It turned out the spindle wears directly in the zinc body, and unlike Weber carburettors they do not run in bearings, and have any seals either. Here is a short clip, showing the revs fluctuation as you apply pressure top the spindle.
Throttle Spindle Play
