Re: Timing

[Joeydahook9@xxxxxxx]

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Top dead center is when both valves are closed and turning the cam either  
way begins to open them.  On BDC, both valves would be fully open.   Most 
engines fire the sparkplug before the valves are fully closed @ tdc to get  a 
scavenge effect to better fill the cylinder.  The motor runs better on  more 
advance, aka, 38 degrees btdc, but it will be very hard to start  at such a setting.  
So a few degrees are built in (vacuum) to let it get  going then the 
mechanical takes over and adds to the already added  vacuum.  ie; 7 degrees vacuum + 
27 mechanical = 38 degrees  total.  At what rpm the total advance happens is 
very important on how the  engine responds.  The mechanical is built in and can 
be changed  with different weight springs or altering the rotating weights 
within the  distributor.  The vacuum usually can be adjusted on some distributors 
 via an allen wrench inserted in the vacuum canister.  This is about my  
limit on timing adjustment.  Earl and Don D have the skinny on this sort of  
thing.  I usually can get a motor running without losing my eyebrows, but  I'm a 
shade tree guy at best.  Hope it helps.   Joe 

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