Famous Circuits Blog

Techy at day, Blogger at noon, and a Hobbyist at night

Posted: 22 Nov 2014 06:50 AM PST

We all know some motorcycle camshaft especially those SOHC engine have a so called Decompression cam or other called it Decompression Pin. But what it is really for what? Take a look at the picture of a shogun 125cc motorcycle equipped with this pin. The hook like pin located at the cam gear of the camshaft is the decompression pin. With that position (hook is resting towards the center, it is actually in the ON position. It already trigger the exhaust valve to open so that when we turned off the engine, the combustion chamber releases unwanted compressed mixture at the exhaust. This scenario makes it easier to start the engine by allowing fresh mixture to enter the chamber when we turned on the engine again. There is more, the unwanted kick back of the kick starter to which can cause injury when turning the engine by kick when the combustion chamber have leftover combustible mixture if this pin is not present.

Others find it difficult to understand why it was there, and they tend to remove this pin saving weight on their motorcycle in order to produce a little more top end, but what they do not actually know. As of my findings in my 10 year old shogun 125cc was. when my decompression pin stop operating normally due to the spacer break down as shown,

i have a real hard time starting it in the morning and kick always kick back to me, and so i decided to replace it with such that can cope the tromendous heat build up inside by handcrafting the spacer from a fiberglass PCB as shown.

I was so lucky that the broken plastic part of the valve train did not manage to create havoc inside my engine because it was trapped somewhere that i manage to pull out when i checked my clutch lining (an article is being written after this)..

I also found out that without the pin attached to the camshaft..and start the engine, abnormal vibration can be felt at the head area, and so i believe it has a function that when the camshaft is turning and the hook begins to move outwards near the edge of the cam gear due to INERTIA, it acts as a balancer of the camshaft for the hook part is against the LOBE of the cam.

So to those who are eyeing of removing this pin..take a closer look at the photo on how this part actually works. It was there for a reason., and removing this will not add you some extra HP or gain you some at the top end.

IEEE Spectrum

Energy Harvesting Nanogenerators Give 130 Volts at the Touch of a Finger

Posted: 21 Nov 2014 01:00 PM PST

Nanoscale patterns boost the voltage from friction-powered energy harvesters high enough to light a string of LEDs

Inexpensive, Durable Plastic Hands Let Robots Get a Grip

Posted: 21 Nov 2014 12:00 PM PST

This rubber-jointed hand can pick up a telephone and use a drill

News post & update: eleccircuit.com

Dual DC power using 2 terminal transformer

Posted: 21 Nov 2014 02:35 AM PST

There are many ways to build the dual power supply from a transformer that has one secondary coil.This good way as Figure 1 use two bridge diodes. The first section is normally working, others section (D1-D4) will work by AC signal from C1 and C2. To filter DC voltage of out others bridge diode of […]

IEEE Spectrum

Six-State Memristor Opens Door to Weird Computing
Video Friday: Robots at Sea, Humanoids at RoboCup, and D-RHex on Sand
Robotic Taxis Could Slash Fares in Austin, Texas
A Single Nanoparticle Enables Two Medical Imaging Techniques
The Inescapability of Ambient Computing
Tesla's X-Men Robots and Lyft's Pink Pool Noodles Bring a Touch of Whimsy to the Workplace

Six-State Memristor Opens Door to Weird Computing

Posted: 21 Nov 2014 08:00 AM PST

A new memristor-based device could be used to build brainlike systems and base-10 computers

Video Friday: Robots at Sea, Humanoids at RoboCup, and D-RHex on Sand

Posted: 21 Nov 2014 07:15 AM PST

"Hey, don't push me, bro."

Robotic Taxis Could Slash Fares in Austin, Texas

Posted: 21 Nov 2014 06:00 AM PST

A computer model finds that few would wait long or pay much for a ride—though sometimes they'd have to share it

A Single Nanoparticle Enables Two Medical Imaging Techniques

Posted: 20 Nov 2014 01:00 PM PST

New capability could open up its use for a variety of diagnostic and therapeutic processes

The Inescapability of Ambient Computing

Posted: 20 Nov 2014 12:00 PM PST

Always-listening, always-watching computers want to help—maybe too much

Tesla's X-Men Robots and Lyft's Pink Pool Noodles Bring a Touch of Whimsy to the Workplace

Posted: 20 Nov 2014 11:00 AM PST

But does Tesla's fleet of superheroes pass the diversity test?

IEEE Spectrum

Experiment in Vienna Shows That Ground-to-Satellite Communication with Twisted Light is Possible
YES! PR2 Very Close to Completing Laundry Cycle
Li-Fi Gets Ready to Compete With Wi-Fi
The Unknown Start-up That Built Google’s First Self-Driving Car
Holographic Food, Brain-Kitchenware Interface, and Other Future of Home Concepts

Experiment in Vienna Shows That Ground-to-Satellite Communication with Twisted Light is Possible

Posted: 20 Nov 2014 09:01 AM PST

Researchers successfully transmit twisted light signals over turbulent Vienna.

YES! PR2 Very Close to Completing Laundry Cycle

Posted: 20 Nov 2014 08:25 AM PST

PR2 can now pick up dirty clothes, put them in a basket, and load a washing mahcine

Li-Fi Gets Ready to Compete With Wi-Fi

Posted: 20 Nov 2014 08:00 AM PST

Visible light communications could outshine Wi-Fi in industrial settings

The Unknown Start-up That Built Google’s First Self-Driving Car

Posted: 19 Nov 2014 12:00 PM PST

Two of Google's signature innovations, Street View cameras and self-driving cars, were actually developed by 510 Systems, a small start-up that the tech giant quietly bought in 2011

Holographic Food, Brain-Kitchenware Interface, and Other Future of Home Concepts

Posted: 19 Nov 2014 11:30 AM PST

Some of the (nearly) impossible concepts from the 2014 Electrolux design contest

News post & update: eleccircuit.com

Hum Filter using electronic coil

Posted: 19 Nov 2014 08:38 AM PST

There are many ways to filter the hum noise from AC line (50 Hz) from audio signal away. A frequency filter usage is a simple ways that include RLC as the electronic coil. In Figure 1 is the specific frequencies filter. Figure 1 the simple specific frequencies filter using RLC If thoroughly consider to see […]