250 sl timing

[aeneasm]

motor is m129. what is the correct timing marks for this motor,point gap and dwell angle.manual trans

aeneas

[mulrik]

I have a 250 SL with the original engine. I use ~0 degrees at idle with vacum on and 30 degrees at 3000 RPM, (where vacum doesn't matter) Points between 38-42 I think or is it 37-41 I can't remember exactly. Gap on spark plugs is 0,9 mm or is it 0,8 ;-) Anyway it sparks.... %CO is ~4%
Let me know if I can help any furhter.

Ulrik


'67 250 SL Papyrus White 113043-10-000023

[hands_aus]

250sl
timing 2 ATDC +/- 2 at idle with vacuum, BBB says this is the way to set up the 250sl

30 btdc at 3000 rpm
dwell angle 38 -1/+3
CO 3.5-4.5%

points gap 0.012-0.015" or replace points with an electronic module eg Pertronix hall effect, Crane optical, etc

Plugs usually straight from Bosch, w7dc, 0.035"
(I have mine set at 0.040")

Bob Smith (Brisbane,Australia)
RHD,1967 early 250 SL, auto