Justering av solex förgasare

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Justering av solex förgasare

Post by Magoo » Thu 22 May 2014, 13:34

Underbara videos :)

1 buggy är en för lite ;) (har 3 st i garaget...varav 2 besiktigade)
Får man in mer än 2 fingrar mellan hjul och skärm är bilen för hög.

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Re: Justering av solex förgasare

Post by kg-student » Thu 15 Jan 2015, 21:13

Bygger vidare på denna tråd om förgasarjustering:

Now on to the actual tuning of the carb
- Tools needed for adjustments
- Large sloted screwdriver, Small sloted screwdriver
- Tachometer - either in the car or an inductive pickup

Main parts that need adjustments
- Fast idle screw - long thin screw that is on the throttle arm
- Bypass screw - large screw (rounded head) on the drivers side
- Volume screw - small recessed screw (flat head) on the drivers side next to the Bypass screw
- Adjust the Fast Idle screw so that it just touches the bottom of the stepped cam (below the first step) and turn it 1/4 of
a turn in - do not go farther or the adjustments will not be correct
- Set the Bypass screw to about 2 1/2 turns out (gently bottom the screw out and then back it out)
- Set the Volume screw out exactly 2 1/2 turns (gently bottom the screw out and then back it out)
- Start the car and adjust the Bypass screw until the engine idles at about 850 RPM
- Adjust the Volume screw to fastest idle (turn screw no more than 1/2 turn in either direction)
- Adjust the Volume screw until the RPM drop about 25 RPM (slight audible slow)
- Readjust the Bypass screw to set the idle back to 850 RPM

Drive your well adjusted carbureted engine around!

Här kan du läsa ALLT o lite till om förgasarna och hur man ställer in dom:
Översatt för den som vill det:
http://translate.google.se/translate?js ... ry_state0=


Ytterligare en, lite mer omfattande beskrivning:

Basic Tuneup, and Adjustment of the Solex 34 PICT/3 Carburetor
This method will also work for the 30PICT/3, 30PICT/4, 31PICT/4, 31PICT and H30/31 carburetors with the
two adjusting screws in the side.
Note: Before we begin to adjust the carburetor, the valves, points, and timing should be set. This is important, and they should be done in the right order, as you start with a cold engine, and end with it warm.
These topics are addressed in the following in this document (see links below; for more detail, refer to our Tune-Up Procedures).
• Setting the Valves
• Setting the Points
• Setting the Timing
• Checking the Choke
• Adjusting the Carburetor
Setting the Valves
Valve adjustment is always done with the engine stone cold.
0.004 inches (0.1 mm)is the factory setting for pre-71 engines. Some folks find that this is too tight after the engine warms and use 0.006 inches (0.15 mm). That's engines with a number starting B..., D..., E..., F..., H..., L..., or a plain number. (I've always used the factory setting on my H... engine without any problems.)
0.006 inches (.15 mm) is used on 71 and up engines. That's engines with a number starting AB..., AC..., AD..., AE..., AF..., AH..., AJ..., AK..., AR..., AS....
The aim of the tappet (valve) setting is to provide virtually NO gap when the engine is at operating temperature.
Setting the Points
The points are adjusted to .016 inches (0.4 mm). Replace them if the contacts are pitted or the cam rubbing block is badly worn. Add a touch of grease to the cam lobs at the same time. Also pull off the rotor arm and take a look in the centre of the spindle it rides on. If your distributor has a felt pad in there, put a few drops of oil (engine oil is fine) on it to lubricate the distributor drive - don't overdo it though - a few drops only. Some distributors don't have this felt pad - in that case skip this procedure.
Setting the Timing
The usual timing settings are:
• 1200 engines with single vacuum distributor - 10BTDC. This is set static - engine off (or at idle with a timing light and the vacuum line disconnected).
• 1300/1500/1600 engines with single vacuum distributor - 7.5BTDC. This is set static - engine off (or at idle with a timing light and the vacuum line disconnected).
• 1300/1500/1600 engines using the double vacuum distributor - 5ATDC. This must be set using a timing light, with the engine idling and the vacuum lines connected so the retard line can pull in the 5ADTC (After TDC).
Note: Any VW engine using the Bosch 009 (or other centrifugal distributor) must be set at the maximum advance with the engine at 3000+rpm, and let the idle advance fall where it may. The reason for this is that the 009s vary in the total amount of advance they make, and the maximum advance is more important than idle advance. The normal setting is a max advance of 28-30BTDC. If you have high quality non-oxygenated fuels, you may be able to use 30-32 degrees advance. The idle advance will then usually fall in at about 5-8BTDC. Please note that VW never used the 009 distributor for any of it's beetle models, and so, although it will work, you may get flat spots and poor pick-up when using this distributor.
Checking the Choke
Now start the engine and warm it up. Take the air cleaner off the top of the carburetory (if it's the oil filled type be careful, you don't want a shoe full of oil) and check that the choke butterfly is standing vertical. If it isn't, run the engine some more to make sure it's throughly warm, and check the choke butterfly again. If it is not standing vertical, the butterfly needs adjusting or fixing (another topic).
It's important to set the valves, points, timing and check the choke (in this order) before setting the carburetor, they all work together for a smooth running engine.
Setting the 34PICT/3 Carburetor
Note: The correct idle speed is important with the 34PICT/3 carburetor, which is more complicated (and more sensitive) than the earlier types. It has three separate fuel circuits in it (only two in older carburetors), and the 850-900 rpm idle is designed so the airflow through the carburetor is balanced for the idle circuit fuel flow. That's why it has both Volume and Bypass screws in the side (the earlier ones had only Volume screws), located on the left side of the carburetor. This way the idle speed can be set correctly using the Bypass screw without touching the screw on the throttle arm, which has to be set exactly right.
1. Make sure that all the hoses are in place and the gasket at the base of the carburetor is sealing properly (no vacuum leak).
2. Install the air cleaner (the carburetor expects it to be there).
3. Turn on the engine and run it until it is warm, then switch it off.
4. The first step is to set the throttle plate. Back off the Fast Idle Adjuster (also called the throttle screw) located at the top of the throttle arm. You will find the throttle arm on the left side of the carburetor, connected at the bottom to the accelerator cable, which runs forward to the accelerator pedal.
Note: Fast Idle Adjuster is a misnomer - this screw it is NOT used to adjust the idle speed. The Fast Idle Adjuster works with the choke to give a smooth idle on a cold engine. As the choke warms (in concert with the warming engine, hopefully) the butterfly valve in the throat of the carburetor opens and the Fast Idle Adjuster screw moves down the steps of the choke fast idle cam, reducing the engine idle speed. Screwing the Fast Idle Adjuster screw in more will increase the idle speed, but doing so messes up the Volume Control and Bypass Screw adjustments. This destroys the idle geometry, and the car won't run right.
5. With the choke held in the full open position (stepped cam at its lowest point), place a piece of notebook paper or a 0.003" feeler gauge between the lowest step of the choke fast idle cam the the Fast Idle Adjuster screw.
6. Slowly turn the screw in until you feel drag on the paper or the feeler gauge. Then remove the paper or feeler gauge and turn the screw in preciselly 1/2 turn - no more! This sets the throttle butterfly open the required 0.004", so you can use the Bypass Screw (read on) to set the idle speed correctly. From this point on, leave the Fast Idle Adjuster screw alone.
7. Next set the volume of gas available at idle speeds. This is done using the Volume Control Screw. Please note that the Volume Control Screw controls the AIR volume, not the fuel volume. Screwing it in reduces the air and makes the fuel/air mixture richer. And of course turning the Volume Control Screw out increases the concentration of air and makes the mixture leaner.
Note: The Volume Control Screw is the smaller of the two adjusting screws, located on the left side of the carburetor just above the Idle Cutoff solenoid (which has a black wire from the positive side of the coil attached to it). The Volume Control Screw is NOT used to set the idle speed - that's the job of the Bypass Screw.
Note: Before setting the Volume Control Screw per the step below, turn the Bypass Screw (the larger one) out a couple of turns, just to get things started.
8. Screw the Volume Control Screw in GENTLY until it bottoms out - you don't want to open up the hole. Now unscrew it exactly 2-1/2 turns. This is the initial setting.
Note: Though you want to be careful to not screw the Volume Control Screw in too far, you also want to make sure that it is initially firmly seated before unscrewing it as specified. If you don't start with the Volume Control Screw firmly seated, you may have trouble adjusting the idle with the Bypass Screw, to the point where you may have it turned all the way in and still have the idle too high. This condition will cause stumbling on acceleration if not corrected.
9. With the Volume Control Screw out 2-1/2 turns, start the engine and let it warm up. (Make sure the automatic choke is fully open.)
10. Now to set the idle. This is done by controlling the volume of air going by the Bypass Screw. The Bypass Screw is larger than the Volume Control Screw and is located a little above and to the left of the Volume Screw.
Note: Again, the idle speed is NOT set with the Fast Idle Adjuster on the top of the throttle arm as it is on the older 28 and 30 series carburetors - though its name (Fast Idle Adjuster) would lead you to think that its used to set the idle.
11. As a starting point, turn the idle Bypass Screw whichever way (most likely out) to set the idle at 850 rpm (fast idle if you don't have a tachometer). For a semi-automatic car, use 900 rpm. (It's far better to have the idle speed too fast than too slow.)
Note: See our Tune-Up Procedure for instructions on how to attach and use a dwell-tachometer.
12. With the engine warmed up and the choke fully open, go back to the Volume Screw and adjust it slowly to obtain the fastest (smoothest running) idle speed (this is usually out - counter-clockwise). You should not turn the screw out much outside the range of 2-3 turns (1/2 turn in/out from the basic 2-1/2 turn out setting).
13. Then turn the Volume Control screw back IN (clockwise) very slowly until the engine speed drops by about 20-30 rpm (slightly leaner). If you don't have a tachometer, listen until you can just hear the engine speed start to drop, maybe as little as 1/8th turn on the Volume Screw.
14. Go back to the larger Bypass screw again to reset the idle speed to 850 - 900rpm. (Again, the fast idle is better than too slow. You want it just a little on the rich side. Too slow of an idle speed can gause the engine to overheat.)
Note: If you find it difficult or impossible to make these settings, it is possible that you could have stripped threads on any of these adjusters, a damaged hole for the tapered screw, or a damaged needle valve or O-ring.
It is also possible that you have a vacuum leak (i.e., leaking of air into the intake manifold). If there are any holes in the manifold or at any of the connection points, then air can be sucked into the manifold, causing the fuel-to-air mixture to become too lean. This can cause (among other things) adjustment of the carburetor impossible. See our Discussion of Air Inleakage, which includes diagnosis and repair.
That's it - you're done. Your engine should be purring like a kitten!
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