69 Z28 Timing

[olredalert]

-------Where do you 69 Z guys like to set your timing??? Car Im finishing up is bone stock in all ways.......Bill S

[Salvatore]

Did you have the distributor re-curved/set-up on a machine?

[olredalert]

-----Sam,,,Jerry M set up the distributer, so I assume stock curve, weights and rebuild.......Bill S

[Salvatore]

If jerry set the distributor up he curved it. There should be a paper that came with it telling where to set the distributor up at idle and where it should be at around 2800 rpm's. probably 12-14 degrees at idle. No vacuum advance is necessary with jerry's set-up.

[Kurt S]

No vacuum advance? On a street car, you want it....

[Steve Shauger]

[ QUOTE ]
If jerry set the distributor up he curved it. There should be a paper that came with it telling where to set the distributor up at idle and where it should be at around 2800 rpm's. probably 12-14 degrees at idle. No vacuum advance is necessary with jerry's set-up.

[/ QUOTE ]

The main function of vacuum advance is during lean conditions, such as highway driving, fuel takes longer to burn, and by starting the burn cycle earlier (via vacuum advance) you get a more complete burn and increase effiency. Its probably a good idea to use on street engines.

[Salvatore]

Hey Steve, You and Paul (both of ya old timers) have a point. I am going to re-asses my set up for the street. Thanks!

[Denis]

[ QUOTE ]
-------Where do you 69 Z guys like to set your timing??? Car Im finishing up is bone stock in all ways.......Bill S

[/ QUOTE ]

Disconnect vacuum advance and rev the engine until the centrifugal advance is pegged out (i.e. with Macneish distributor, should be all in by 2500-2800 rpm). Adjust for 36 degrees total. Don't worry about initial timing setting. Reconnect vacuum advance. If road testing causes knocking, retard the timing in 2-degree increments until knock stops.

[olredalert]

-----Thank you, one and all!!!!!!! Its been so long since I had it done that I had forgotten (just another senior moment).........Bill S

[Chevy454]

[ QUOTE ]
Where do you 69 Z guys like to set your timing???

[/ QUOTE ]
From a technical stand point, your timing is determined by a few things, namely cylinder pressure & fuel...timing up to the point of detonation is not always the optimum point...most folks would be surprised at how *low* some engines like their total timing to achieve optimum HP.