Grant MacLaren's
1981 18' Century Resorter


Ignition Curve

The engine in Grant's 1981 Century is a 350 cubic inch (5.7 L) "small block" Chevrolet V-8,
converted to electronic ignition.

On 6/6/12, Bud Eiler provided these numbers for
ignition advance on MerCruiser.
I'm unable to find the "basic" advance settings.
(I've seen both 8 and 10 degrees BTDC)

1250 rpm +5 degrees
1800 rpm +10 degrees
2400 rpm +15 degrees
2900 rpm +20 degrees
3700 rpm +25 degrees
3900 rpm +26 degrees

On 6/12/12, Bud gave me this chart:


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Another pretty good web page by Grant MacLaren