vette
Darth Vader
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Back from from vacation and from Bosch! Here is what they found:
To recap:
- First of all I found with a strobe light the ignition timing to be set at 45° at idle and 65° at about 4500 rpm.
- I then replaced the old no resistance igniton wires with new no resistance wires and measured 30° at idle, but still not 15° (may be due to electrical interferences)
- Next thing I did was to replace #1 sparkplug wire with a resistance wire --> but no difference!
Bosch measured 23.9° BTDC! They use a computer system which a strobe light with advance control is attached to.
View attachment 45482
So, my strobe light ist about 6° off!
But what about 23.9°? They confirmed, that the enginge is running very well with this timing.
Lutz, in your recap your point #3 says that you replaced the #1 spark plug wire with a resistance one. and it made no change. I believe there is alot of electrical interference going on there. the other no resistance, non-shielded wires are creating alot of magnetic interference. It seems surprising to me that 2 different timing lights (yours & your friends) as well as the Bosch system can't time your engine. If you change out all your wires to resistance onces, I wonder if the timing would then show to be in the traditional parameters. Dave.