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Re: Why do we need so much darned initial static timing?
Quote:
Originally Posted by davepl
The BBC in my truck wants, according to the tuneup sticker, (I think) 4 degrees initial with an auto and maybe 0 degrees with a manual. But whatever the actual numbers, 4 is the ballpark. And it'll barely run like that.
Over the on Chevelle forums, where there's a bit more big block stuff going on, the consensus seems to be that most are finding 16 degrees initial is required for best idle, and you then wind up pulling out total so you don't overshoot.
If that's true, great. But as much as old timers complain about "today's fuel", I still don't really know the how and why of us now needing so much more advance. It's not like nitro (very slow burning)!
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Forget about the initial...set the total @ around 36 degrees, @ 2800-3200....where does the initial fall? Add 8-10 degrees to the vac can (at the crank)_, & you should be damn close  I agree with Marv....after a couple more glasses of bourbon, we would have fun conversation! Honestly, that mill will be running/ pulling max mechanical advance @ 3000 rpms.....on a lite throttle "cruise', you may see 46-50 degrees, with the vac can involved? Figure , that most HEI dist, have about 20 degrees in the mechanical advance....I would add 14 to 16 intial to that. He!! we run 18/38 on the track in little bros truck...no vac advance, cut @ 2600 Longhorn
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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