timing tuning problem

[jondee86]

Dyno Bench = Chassis Dyno (Rolling Road or Hub Dynomometer) ?

It is usual when testing on a rolling road, to make a series of tests
from low rpm to high rpm with WOT. The dyno provides enough
resistance to control the rate of increase in engine speed. This allows
the monitoring equipment to take reading at certain speeds, for the
purposes of creating performance graphs.

Under these conditions the engine is operating at maximum load
and the ignition advance will be suitable for the WOT AFR.

Without any load, if the throttle is snapped wide open, a 4AGE engine
will run from idle to redline in one second . This is hardly long enough
to take any ignition advance readings... unless you have some fancy
electronic equipment

If the timing is set to 30 deg advance at 5500 rpm without load, it will
drop to 20 deg or less with load at WOT. Standard timing is >16 deg
advance at idle (T and E1 not shorted). You had 7 deg, which shows
that it was retarded by at least 10 deg from standard. You would be
down on power, and at risk of burning exhaust valves

Cheers... jondee86

[filh]

by Dyno bench , I meant rolling road .

I have 7° at idle with Tand E1 shorted , but I forgot to check without jumper
if I'm near 16° or not . That's what I'll check .
THANKS AND REGARDS
Filh