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.

Establish NVH on air-cooled Beetle

Rear compartment was face-lifted today on VW 1302 Super Beetle. The insulating board were glued to the fire board with some technic.

Some sheet of plywood was set on the surface pressing evenly and shore bars were applied for the purpose. The glue was vinyl acetate, White Bond for wooden material.

Though covering with wall paper would finish this procedure,I determined to put one more layer of rubber sheet material for the purpose of establishing more silent and calm driving, experimental applicaton of the material had proved the enough effects.

The glue for rubber material is Bond G-17 diluted with organic solvent.

Digesting

The distributors exchanged from 009(centrifugal mechanical advancer only) to BOSCH genuine with vacuum advancer(together with CM advancer). Incredible improvement in driving feel was recomended.

009 would not be used any more on my VW 1302 Super Beetle.

Short and far shift lever was modified to compensate these disadvantages, by 45mm extending shift knob positon and 5mm moving back the shift lever base plate position.

Though shift lever strokes were increased a bit, shifting comforts were obtained.

Hitting mark was observed inside of the rear gate being criminal the tip of the air cleaner intake.

Keeping some clearance between them, counter-clockwise rotation of air cleaner was necessary.

Finally 3mm thickness spacer insertion solved this ploblem.

Microflon(fine grain of Teflon powder) application in the steering gear box was performed yesterday inviting satisfaction results.

Today's task is to make up the rear compartment on Beetle, descriptions later.

Interesting attempt

New parts BOSCH genuine distributor equipped with vacuum advance arrived from Mybows Tokyo yesterday.
Comparing with 009 without vacuum advancer only with centrifugal mechanical advancer, the physical property would be far improved especially the transient from idling to medium motor rotation.
Now with 009 lack of vacuum advancer causes some stumbling and hesitation, though high rotation has no problem.
Descriptions later.

Rear window seal rubber was relined with silicon coking material preventing roof leak and rusted floor was cleaned for the next repairing steps.

Clutch wire was lubricated with splay grease and linkages including pedals also.

Amp meter bracket was re-tightened at the original position on the lower dashboard repairing illumination circuitry.
Without this meter activation the ignition relay does not work,so
in case of failure of this meter with open circuitry shortening application is required to start.

Alternator model has no Amp meter,I must consult the difference between alternator and generator, former is alternative and latter's direct currents promptly.

The arrangement of air vents on rear C pillars inside must be considered,because the number of the plastic parts is 6 instead of actual holes are 8 on earth?

The beige color rubber sheet prepared would play a good part of insulation enough form the rear engine room and from the ground.
The steel sheet utilizing the old washing machine case would be adhered finally to the floor panel with silicon coking material.

Vacation started

The roof leak on rear window shield rubber strips would be repaired today with black silicon sealing material.
This working must be done as soon as possible because the rainy season is coming. The inconvenience to parking outside must be overcome at any rate.

The big hole would be closed with 0,4mm thickness plate from the back cover of washing machine holding tapping screw and transparent silicon sealing material.
Some piece of flooring rubber sheet in beige colored for insulation is prepared and this same rubber material may be utilized for more insulation on floor surface of the cabin is prepared for later working.

Minor parts are come from Tokyo already and genuine Bosch distributor with vacuum advance diaphragm is arriving from Mybows in Tokyo also today.

I'm not satisfied with the function of 009 distributor without vacuum diaphragm advancer because of the dead zone of acceleration that should be much more linear and smooth.
009 is useful but not so comfortable as the combination with vacuum advancer and centrifugal governor mechanical advancer.

The original double vacuum diaphragm distributor would be disassembled and the diaphragm case would be cut and separated in two pieces to replace the diaphragm sheet rubber.
Judging from the outside observation of the diaphragm case, it may be possible to repair the defected rubber parts and re-obtain the original functions, very special functions in specific production period, together with advancing and retarding.

As an experiment, also see what will happen if the retarding function only would be killed, probably in that condition too much advancing angle may be observed?

Thermostat functions must be checked this morning, bi-metal should be in shrunk figure and after that the length would be increased to open the cooling air intake doors mechanically. Even now I feel some hot air flows if I do accelerate manually standing behind Beetle, so actually the doors are activated and opened but on closing function for cold starting stage I'm not sure.