Join Date: Feb 2004
Location: Victoria. Australia
Clevo Ignition Timing
Looking for opinions from the learned gentlemen out there. I have been playing with the initial and total advance curves for some time now and to my bewilderment the Clevo likes 20 initial and 22 – 24 degrees mechanical advance (total 42 – 44 degrees). Before you right this post off as another d^”khead with ridiculous claims, read on. I’ve tried the 20 initial 12 mech, 12 int and 20 mech advance and many combinations in-between.
My engine specs are 351 + .020, 0 decked, ACL short flat tops, 302 closed 2V heads, 302 6.02” rods, F238 (21626) cam, 10.9:1 CR, tri-ys, 750DP, 3200 stall, 3.5 gears.
My hypothesis is, the engine likes the increased advance due to the longer piston dwell at TDC having the longer con rods. Secondly cooler combustion temps i.e.: quenching, polished chambers, 80C thermostat, shaker etc.
Note: The cam timing was set to zero with absolute precision! And the damper hasn’t slipped.