Vacuum advance hook up
Connect your hose from this port directly to the vacuum advance can. I know the port vacuum is not there straight off idle.
If we had to use a generic maximum advance that seems to work for most pump gas engines, somewhere around 34 to 36 vacuums advance hook up before top dead center BTDC is a good number.
San Antonio, Texas Age: Engines from this era often ran very, very hot, were prone to warped exhaust valves, cracked cylinder heads and all other manner of issues.
Plugging your vacuum advance into a direct source will allow it to engage at idle, which is good for a number of reasons. The engine would now idle strong in neutral and drop about rpm in gear and idle just as strong.
Modern computer controlled spark and fuel is not the same as old-school distributor and coil.
More dense fuel, earlier the timing. Its definitely more lopey with ported, but in the winter its really not better.
It's the easiest hookup for distributor vacuum. Mad Maggot The lean mean donut machine. Manifold vacuum is highest at idle and part-throttle cruise — precisely when the engine can use the additional advance. Thanked 43 Times in 41 Posts.
Timing is Everything
In that situation, what many might deem a radical amount of timing is actually quite beneficial to engine performance. So which is it?
I also know that hooking up the vacuum advance to the port on the carburetor will only provide vacuum when the throttle blades are high enough to cover the vacuum port, such as at cruise and part throttle, and will produce little vacuum at idle and WOT.
As an example, at a cruise rpm of around rpm if the mechanical advance is nearly all the way in, you might have 30 degrees of total timing — adding that vacuum advance of 16 would produce 48 degrees of timing which is a good place to start. BlewJan 29,in forum: Find More Posts by cardo0.
In order to be able to post messages on the Hot Rod Forum: Load based will be different than that at either at WOT or in decel. All times are GMT How to rebuild a Rochester Quadrajet 4MV carbureto That would also clean up one more hose going across my engine.
Sorry, your blog cannot share posts by email. The carb is rated at cfm.
September 27, at 8: In I preferred ported but now 7 years later I found manifold works best for my setup. This mechanical also known as a centrifugal advance is an extremely reliable and simplistic approach to controlling engine timing at given engine speeds.
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Not on a vacuum advance hook up stretch of highway. Vacuum Advance or Mechanical Distributor? If so, back the adjustment counterclockwise one to three turns and you will be very close to the ideal timing at part throttle.
The only time to use the ported vacuum feature on the carb, would be if you had a functional EGR.
Then hook up vacuum advance and adjust it like you mentioned. Originally Posted by lars I did not say that you need to use vacuum directly from the intake manifold - I stated to use a manifold vacuum source on the carb.
If you are having higher rpm cruise pinging but not wot pinging you may have too much vacuum advance in the canister. These are typical numbers.
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