Solex 34PICT3 adjusted

VW 1302 Super Beetle's carburetor Solex 34PICT3 was re-set from the first step,though the legal inspection has passed on exhaust gas checking, later precise checking revealed the perforations on vacuum actuator diaphragm for ignition timing both advancing and retarding.

The perforation on retarding diaphragm means the vacuum leak leading to leaner fuel mixture, so air volume control adjust screw was loosened counter-clockwise 5/8 rotational turning logically,now the nipple for retarding is closed.

Closing unreasonably and unintentionally opened air way has gotten back the originally richer mixture condition.
Also throttle butterfly closest position was re-set as standard one.
Motor stopping habit in the condition of first idle disappeared after carburetor setting.

Throttle stopper positioner, air volume control screw and bypass screw were all moved considerably with no relations with original positions.

I re-recognized the fact that the idling stability affects not only on idling but also all the rotational circumstances.

Application of wall paper on additionally insulated firewall of VW1302 Super Beetle　has improved the scenery in the room mirror.


33333km has appeared in the single meter cluster of my Super Beetle today.

Low dropout reguletor

Deeper consideration about 3pins regulator got me out recognizing the low voltage drop type semiconductor,

7812 requires 2,5V difference at the least, otherwise the ripple remains on the output. I must refer to the output voltage after the original regulator.

LM2940CT12 National Semiconductor's element requiring bipolar 0,22 micro Farads and monopolar 47 micro Farads. Additional experiment would performed in very near future.

I feel the greatest joy when I could adjust the internal combustion engine at the ultimate performance condition by my desperate efforts, this tendency has not been changed since my childhood.

The VW AD 1600cc OHV motor is getting well at an accelerated rate these days by precise adjusting air volume adjuster.
The burning condition is discerned by the smell of exhaust gas quite accurately.

Finding out the traces of dripping at the corner of frontal window screen, I knew that the roof leak from sealed rubber exists not only at rear window portion but also frontal one.
The countermeasure on this problem must be taken.

'71 VW 1302 Super Beetle at my hand is getting accustomed to daily use recently by my DIY improved maintenance.

Voltage vibrator

The semiconductor 3pins regulator 7812 produced 11,85V with stability in 13,75V circuitry. So stable voltage must be supplied in fuel gauge circuitry on VW 1302 Super Beetle, now drifting 2mm on stylus tip continuously controlled by primitive mechanical vibrator equipped bi-metal and heater construction 40 years ago.

The nowadays semiconductor and some capacitors has smaller balk enough to be set in ancient voltage regulator case with pretending old parts but inside existing semiconductor with good performance to drive the primitive fuel gauge.

Additional application of rubber sheet on fire wall of my Beetle eliminated irritation noise thoroughly, but another problem occurred, the gear noise from trans-axle is heard clearly instead.

The fact that the elimination of engine noise brought up new noise which was masked by engine noise passing through the fire wall.

The floor must be covered fully in addition to shut out the trans-axle noise,as a countermeasure.

Destruction of maker fixed NVH balance is apparent on earth.

We call this kind phenomena,"Mogura tataki", meaning hitting head of a mole one after another unlimitedly.

Nipponbashi Osaka

Residual tasks would be digested today on VW1302 Super Beetle, rear window sealing between grass and rubber seal,as some experimental trial, replacing original mechanical voltage regulator fixed on the speedometer into 3 pins regulator(semiconductor 7812 12V1A),because the mechanical vibrator with bi-metal causes drifting of fuel gauge stylus.
Now residual fuel amount is not shown precisely on the fuel meter,so more stable voltage stability is required if the meter construction is so primitive as child's toys.

Visiting Nipponbashi in Southern Osaka, I found the great changing in the scenery, very few people were there and Silicon House Store were disappeared, Sengoku Denshou from Tokyo Akihabara appeared instead.
The reduction of customers must be brought by the changing of recent shopping style into Web dealings.

Tiredness by noise

Though the additional rubber sheet application increased the engine and trans-axle noises insulation on the rear fire wall of the VW 1302 Super Beetle, the sound and vibrations from shift lever is highlighted this time.

This kind of trial should be performed by the manufacture's developing division, so again I realized. The improvement on some part causes the destruction of sound insulation balance by the factory design.

Anyway this kind of insulation must be tried until the drive should not be suffered from the tiredness after driving an automobile, because not only vibration but also noisy circumstance could cause driver's fatigue.

I just remembered 40 years ago, I had been an owner of 1200 VW Beetle Standard Model that had no insulator on oblique fire wall surface. Also I remembered the sound of silence after the motor stopped.

Leak remains

The measure for the roof leak on VW 1302 Super Beetle was performed few days ago by applying silicon sealing material into the clucked cavities on window shield supporting rubber material periphery outer circle.
Rain fall today revealed that the leak still remained as the matter that can not be overlooked.
Residual roof leaks were observed lower bottom corners on both side in the cabin which was from the leak between grass and rubber material,inner circularly. I've realized the measures were not enough, not only the outer circle but also inner circle sealing was necessary, giving away as a layman.


I prefer silent natural circumstance to the artificial ones like this kind of scenery in the country side mountain.
Slow driving in the empty country winding roads is suitable for an ancient air-cooled Beetle?

Indispensable Vacuum Advancer

From the beginning I didn't feel fine somehow on VW AD motor in 1302 Super Beetle.
Replacement to BOSCH genuine distributor from 009 thoroughly cleared strange woolly feeling,old stock new parts has vacuum advancer and simple and cheep 009 has centrifugal mechanical advancer only instead.
The advancing is required immediately after acceleration to compensate the change of operation with more fuel at the same time.
But 009 could apply only more fuel, this is why the driver feels some complaint about acceleration, stumbling and hesitation.
The vacuum is once lost by opening throttle valve,the ignition timing must be advanced immediately, recent computerized automobile has a intake manifold vacuum sensor for the purpose,this advance gives driver comfort undoubtedly.
In spite of the necessary advance value 28 degree/3,000rpm is attained on 009, some better result was not obtained,do I guess the fundamental reason on this point?
An atmospheric temperature sensor, an intake manifold pressure sensor or an air mass sensor contribute to the motor stability and to the perfect control of motor performances.
I reaffirmed the physical property of the internal combustion engine after adjusting the old designed VW air-cooled AD motor.