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From: Snag <Snag_one@msn.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Successful Transplant !
Date: Fri, 25 Oct 2024 08:41:09 -0500
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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 .