From: Snag_one@msn.com   
      
   On 10/25/2024 7:38 AM, Jim Wilkins wrote:   
   > "Snag"  wrote in message news:vfg0iq$35k3b$1@dont-email.me...   
   >   
   >    The only control on this one is a vacuum switch . It can be tested   
   > with a vacuum pump and a volt/ohm meter - if I knew which wire went   
   > where . I haven't done much tuning , I was waiting until I had the drive   
   > train in it's final configuration .   
   > Snag   
   >   
   > ----------------------------------   
   > In case you or some other reader doesn't know it, intake manifold vacuum   
   > is an easily accessible indication of the combined accelerator/throttle   
   > position and the load on the engine. It's high when cruising at a light   
   > load that allows more distributor spark advance without knocking and   
   > torque converter lockup.   
   >   
   > https://help.summitracing.com/knowledgebase/article/SR-05127/en-us   
   > "Under a light load and part throttle conditions, timing can be   
   > advanced. This improves throttle response and makes the engine more   
   > efficient. It also helps the engine run cooler. The vacuum advance   
   > provides this benefit BEFORE the Mechanical Advance provides Total Timing."   
   >   
   > I've been in the GM lab with the "flow bench" for testing carburetors   
   > but didn't have a chance to learn about it, the machine I had built and   
   > was setting up simulated faults in the 12V power supply to a fuel   
   > injection computer.   
   >   
      
     I've got an Edelbrock 1405 on it , can't justify the cost of an   
   aftermarket injection setup . Ignition timing is one area that I intend   
   to work on . I have an Accel HiPo distributor on it . My performance guy   
   thinks that I need to dial in more than 8° initial advance , and there   
   are adjustments on the dist for how fast the vacuum advance comes in .   
   This will never be a "fire breathing monster" , but I do hope to get a   
   little smoke from the rear tires ...   
   --   
   Snag   
   Voting for Kamabla after Biden   
   is like changing your shirt because   
   you shit your pants .   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)