max cruise timming

[ony]

if you got fuel adjusted 126-132 what would be the maximum timming you would want to run on a light cruise?

[sturgillbd]

Are you running Vortec or swirlport heads on this engine?

[ony]

there swill port

[sturgillbd]

Most people find 26-30 degrees max works best on those heads. Attached is my swirl port headed V8 table. It is $0D on a 7427 so you will have to interpolate. As always use at your own risk but this is nothing radical. This is in a light vehicle. It seems like Dave W. posted a performance table for TBI and a 7747. Your V6 may want more or less advance so just play with it and watch knock counts.

[Fast355]

Most people find 26-30 degrees max works best on those heads. Attached is my swirl port headed V8 table. It is $0D on a 7427 so you will have to interpolate. As always use at your own risk but this is nothing radical. This is in a light vehicle. It seems like Dave W. posted a performance table for TBI and a 7747. Your V6 may want more or less advance so just play with it and watch knock counts.

That is WOT, cruise timing is limited to 42° + Initial on a V8. I generally run up to 10° initial at the distributor. Cruise timing for swirl ports can be as high as 48°. My Vortec likes up to 52° at light throttle cruise.

[ony]

thanks for the info. been adding 1 degree at a time and its starting to come alive. no knocks yet except on start ups and shut downs 21 and 9. seems funny not adding oil every week.:jfj:

[sturgillbd]

Here is the thread I was talking about. http://www.gearhead-efi.com/Fuel-Injection/showthread.php?2540-Performance-Timing-Table-Chevy-5-7-Liter-TBI-ECM-1227747

I had quite a few knock counts at cruise above 33 degrees. Each engine is different.

[ony]

that's some good info,fast if I set initial timming to 6btdc do I just set the inical in the bin the same?