Originally Posted by
steveo
as far as efficient timing advance goes, due to its combustion chamber design and unique cooling system, you'll find that under light loads, the lt1 has a particularly wide flat area between the two timing advance points of 'just enough timing to burn everything' and 'too much timing, and power loss starts'.
really big. in terms of power and feel, on my car i could -barely- tell the difference between 35 and 65 degrees in cruise range. but you could see it on a vacuum gauge for sure, if you held steady throttle and varied timing.
don't be afraid to experiment with a crapload of timing in cruise range. the combustion temperature and stress on internal components is very low when the engine is unloaded. a bit of detonation will not blow stuff up or melt pistons if you aren't running like that for hours. in my experience your car will protest with surging and bucking and feeling 'strained' way before it hits the point of knock anyway.
your experience may vary.
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