See full version: Beeper box for setting points and timing
Your new BeeperBox takes a single AA battery. On the opposite end of the rectangle from the on/off switch, you will find an indented pull-tab which you can use to slide off the compartment lid. Once the battery is inserted, simply line the flat end of the lid up with the depression on the side of the unit with the on-off switch, then press the lid into place on the other end. Now you're ready to start using the beeper! here
Directions for the BeeperBox From Future Aids, The Braille Superstore. more
This tiny device has a million creative uses. When working with young blind or visually impaired children, you can go hide the beeper somewhere, and have the child track it down - much like a game of Hide and Seek. And when kids get older and you're teaching them mobility skills (how to use the white cane), this little beeper is very useful for audibly marking landmarks, street corners, etc. We've even heard of sighted folks attaching our beeper to a handlebar on their bicycles, so their blind friends can follow them on their bikes! (Uses one AA battery - which is not included.)
It sounds so simple, yet the possibilities are endless. Place a beeper at certain spots along a track, so blind runners can compete just like everyone else. Give the box (which weighs less than a single battery) to whoever's It during a game of tag. Place in cones for an audible obstacle course, or on other objects to aid in O&M instruction. Follow a runner, someone on horseback - even another bike. The uses for our BeeperBox are only limited by your imagination.
Flicking the switch will immediately cause the box to emit four quick beeps. The unit will pause for just shy of a second, then beep again. It will beep continuously until you turn it off, or it runs out of power. more
Necessary components
These timers are available commercially from aircraft tool supply houses, but a suitable box may be simply constructed from materials often found in the well-equipped engine buff’s shop. The following materials are needed:
Battery: 3 to 6 VCD; use two or four D-cells in series, adjust buzzer to suit voltage.
Timing a high tension magneto to an engine is not particularly
difficult, but having the right tool can certainly make the job a
lot easier. I hope that you will find this timer a useful addition
to the toolbox.
If you have recorded slide timings and find that there are a couple of timings you want to tweak, you don't need to re-record the whole show.
Then, click the TRANSITIONS tab.
Or, to clear timings completely, click the arrow next to Record Slide Show, point to Clear, and click either Clear Timing on Current Slide, for selected slides, or Clear Timings on All Slides.
Vacuum advance was developed to optimize fuel economy and reduce emissions. While it is not a bad thing to have on a car that sees a lot of street driving, many aftermarket performance distributors do not even come with a vacuum advance. The reason is because race cars do not spend much time at part throttle.
If the mechanical advance travels too far, limiting bushings need to be installed on the limiting pin. This pin is located under the advance mechanism on a GM distributor. here
A good rule of thumb is that the higher the engine’s compression ratio, the less total timing it can use before detonation occurs. Also, a higher octane fuel is required for the engine, to help control detonation. Low octane fuels ignite faster, thus require less timing advance. Conversely, high octane fuel can handle slightly more timing advance. Dyno testing has shown that most small blocks running Premium pump gas with 9.0:1 – 9.5:1 compression make peak horsepower with roughly 38-42 degrees of total advance. Engines with 9.5:1 – 10.5:1 typically require 35-38 degrees total. Finally, if running an engine with a compression ratio above 10.5:1, total advance should not go higher than 35 deg. total. When using power adders, the timing should be advanced accordingly. more
What is meant by a timing advance-curve? Inside the distributor are advance springs and weights that are designed to advance the timing by centrifugal force as the engine speed increases. If advance is measured at small increments of engine rpm, the timing figures created by the weights and springs as they move outward during engine acceleration will define the advance curve when plotted on a graph. Factory advance curves are engineered to provide acceptable performance and emissions control. However, varying the curve from a factory stock setting will usually yield improved engine performance.
The center plate also has an effect on both the curve and the maximum advance. Its shape defines the advance rate and the maximum allowable advance, and modifying the shape of the center plate is easy and yields significant results. more
On race cars, the engine spends very little time at low rpm, so many times the vacuum-advance system is eliminated. In general, cars with automatic transmissions with stock-type or even a slightly looser-than-stock torque converter respond well to more mechanical advance in the lower rpm range. Manual transmission-equipped vehicles and vehicles with torque converters that “stall” around 3,000 rpm and more, are not as sensitive to such changes because the engine is not usually loaded at the lower rpm.