Re: Successful Transplant !

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
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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 .