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Aisan carburetor, which port for vacuum advance
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m1911a2
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Nov 17, 2012, 5:46 AM
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Aisan carburetor, which port for vacuum advance
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Year of vehicle: 1997
Make of vehicle: Toyota
Model of vehicle: Corolla XE
Engine size: 1.3
Mileage: 20xxx
Hello there Gentlemen, i need help which port on my Aisan carburetor should i connect the vacuum advance of my distributor.
[url=http://postimage.org/]
Enery cannot be created nor destroyed, it can only be transformed from one form to another.
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Discretesignals
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Nov 17, 2012, 8:25 AM
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Re: Aisan carburetor, which port for vacuum advance
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We don't have that vehicle here in the states. Highly surprised Toyota would be playing around with carbs in the 97 model year in a Corolla. Is there a vacuum schematic under the hood? The one that the advance connects to is going to have vacuum (ported) when the throttle is opened and no vacuum when the throttle is fully closed.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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m1911a2
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Nov 17, 2012, 7:58 PM
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Re: Aisan carburetor, which port for vacuum advance
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There is no schematic under the hood sir. Looking at the photo previously posted where could i possibly connect the vacuum advance for a ported vacuum?
Enery cannot be created nor destroyed, it can only be transformed from one form to another.
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Discretesignals
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Nov 17, 2012, 8:07 PM
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Re: Aisan carburetor, which port for vacuum advance
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Best thing to do is install the carb. With the engine running, pull one vacuum cap off at a time and plug a vacuum gauge in. You want your vacuum advance hose connected to a port that doesn't have vacuum on it while the engine is idling (throttle closed). When you find the one without vacuum on it at idle, blip the throttle and see if vacuum appears. If it does, that is the one you want your advance connected too. Understand that there may be other vacuum operated devices that need ported vacuum too and there will be others that need vacuum all the time (manifold).
You really need to get hold of a vacuum diagram.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 17, 2012, 8:08 PM)
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m1911a2
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Nov 17, 2012, 8:29 PM
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Re: Aisan carburetor, which port for vacuum advance
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Thank you so much for that Sir, I will install the carb now.
Enery cannot be created nor destroyed, it can only be transformed from one form to another.
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Discretesignals
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Nov 17, 2012, 8:36 PM
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Re: Aisan carburetor, which port for vacuum advance
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Understand that even though that carb looks reman, you will still need to make curb and fast idle speed adjustments once you get it running. If the throttle is open too much at idle, you'll see vacuum on all of those ports. Make sure the choke is unloaded and the curb idle speed is set to factory.
So weird seeing a carb on a 97 vehicle...LOL. Looks like it doesn't have a mixture control feedback system either..
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 17, 2012, 8:38 PM)
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m1911a2
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Nov 18, 2012, 5:31 AM
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Re: Aisan carburetor, which port for vacuum advance
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Hello there Sir, I have verified and confirmed that (referring to the photo i previously posted) carburetor nipple #3 and #4 are ported vacuum, that is vacuum is present whenever i blip the throttle and vacuum is zero at idle.
Now my next query is to which port would i connect my distributor vacuum advance line, below are photos of my distributor vacuum advance lines. Please help me which line goes to which port.
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(This post was edited by carjunky on Jul 4, 2017, 2:36 PM)
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Discretesignals
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Nov 18, 2012, 8:48 AM
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Re: Aisan carburetor, which port for vacuum advance
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Oh boy, a Dist-O-Vac system.  This is where I don't have an answer for you. Your going to have to get a vacuum diagram of that system to find out where to connect those two hoses. One hose is for vacuum advance and the other is vacuum retard. Dist-o-vac sometimes had some sort of vacuum control device. The valve may be electronic or controlled by heat of the coolant. The advance hose is #2 and the retard is #1. On some of the older carbed Toyotas here in the states the advance was connected to ported vacuum and the retard was connected to the manifold vacuum. On others there was some sort of vacuum control device such as one for high altitude compensation. I have no earthy clue how that system is arranged. Sorry, can't help you there. Someone else may have an answer though.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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re-tired
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Nov 18, 2012, 12:02 PM
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Re: Aisan carburetor, which port for vacuum advance
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Hi, please pick the right diagram for your engine:
Carbureted engine, not California
 see if this is of any help
LIFE'S SHORT GO FISH
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m1911a2
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Nov 18, 2012, 7:11 PM
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Re: Aisan carburetor, which port for vacuum advance
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Thank you so much for your time, at least i know which line is for advance and for retard.
Enery cannot be created nor destroyed, it can only be transformed from one form to another.
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m1911a2
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Nov 18, 2012, 7:12 PM
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Re: Aisan carburetor, which port for vacuum advance
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Thank you so much for your time replying to my query, i have to work on it now.
Enery cannot be created nor destroyed, it can only be transformed from one form to another.
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Hammer Time
Ultimate Carjunky
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Nov 22, 2012, 9:34 AM
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Re: Aisan carburetor, which port for vacuum advance
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I deleted your other question ............................ Don't create duplicate questions.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Nov 22, 2012, 3:16 PM
Post #13 of 15
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Re: Aisan carburetor, which port for vacuum advance
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From post #8 Quote">>On some of the older carbed Toyotas here in the states the advance was connected to ported vacuum and the retard was connected to the manifold vacuum.<<"
TMK Toyota and some others were meticulous for late carbs enough to make your head spin. Ported vs manifold vacuum. Ported (middle of carb section) is venturi effect ((air speed)) created vacuum.
Purposes were to advance or retard based on load on the engine to result in less advance for WOT or no vacuum advance added for timing. Manifold vacuum is high with no load and higher than idle vacuum as when engine is acting to slow the vehicle. You would design more advance then to allow more time for fuel to burn.
Other reasons: Initial choke pull off should get unfettered manifold vacuum and probably more again when part warmed up to open choke as on target as possible till no longer in use. Another was not to allow engine to return to idle too quickly as any sudden changes spit an extra atom of emissions.
Another probably not done is the choke housing was very slowly drawing in hot exhaust temps to shut it down faster. Probably not on this late of carb.
By all odds the vacuum available is not direct from carb to the distributor or other diaphrams but also checked as to how much and when based on engine temp.
Yes - I have a headache just thinking about it. Nice pics. If not exact detailed routing matches that should be what is being done. Might be a couple of guesses that would surely run better when right. Do mark what ends up right for any other time you get back there or hoses off for any reason so you don't have to rethink this.
Sorry - just some rambling on what the intent should be for. Not to knock and not to emit too much unburned fuel even for slit seconds all considering temps of probably both engine and incoming air in air cleaner housing. Bring out the exact known diagram or lots of aspirin but it can be figured out,
Tom
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m1911a2
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Nov 23, 2012, 6:55 PM
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Re: Aisan carburetor, which port for vacuum advance
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May i ask for your inputs, comments, analysis. I connected lines #1 and #2 of the distributor vacuum advancer as shown on images below.
[url=http://postimage.org/image/85c6rc47z/full/]
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[url=http://postimage.org/image/n56f87tcv/full/]
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Enery cannot be created nor destroyed, it can only be transformed from one form to another.
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Tom Greenleaf
Ultimate Carjunky
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Nov 24, 2012, 1:45 AM
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Re: Aisan carburetor, which port for vacuum advance
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Your drawing of when vacuum applied at distributor and direction that plate moves suggest both are retarding spark timing in probably different degrees. While running, hoses plugged you should see a difference with timing light.
Basic norms: Timing is set at a certain RPM without vacuum involved but engine warmed up. Advance should be centrifugal unseen under the plate increasing timing advance as RPMs rise.
Too much advance can knock not taking advantage of the best point where power from combustion is optimal. Too much retard it will be late and risk not burning the fuel completely. These change by load on engine, engine temp, incoming air temp RPM at the given time to make the best choice to get the most use out of the fuel which in turn reduces emissions.
The exact diagram for the exact application would really help to be sure it is as designed. Notes from original design may allow different base timing for what octane fuel is available and doubt this engine can determine "knock" which would alter adjustments accordingly.
Just a couple notes on your pics and comments: "Gas filter" on intake manifold?" Seriously doubt you mean gasoline. A bi-metal device is sensing temperature. When to an engine and vacuum controls it would be for plain flow or no flow or gradients in between unknown to me for this.
Go back and check this against diagram already in this thread and see how much follows what. If not like that you need the exact one to even check that all controls are in place and more info that they work when they are supposed to. I would have no way to re-create that info that might have been on a decal underhood somewhere for the specific application,
T
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