Race Tips - Performance Tech News            

from Auto-Ware

Jan 2012 

Race Tips -  More Winter Shop Tips


With the continued development of new materials and equipment, many old skills are fading away. Brazing is becoming one such lost art, but sometimes it is just what the doctor ordered on either the racecar or support equipment. So here is another winter shop tip.


When brazing, I find it's best to use a slightly "carburizing" flame, rather than a neutral flame. Depending on the size tip you have on your torch it may require different oxy & acetylene pressures, so instead of pressures I use the following procedure to set my flame:


Start with both regulators backed off (counter clockwise) until they turn freely. Have the acetylene bottle valve opened 1/2 turn and oxygen tank valve opened all the way.


Then on the torch handle, open the acetylene knob 1 turn and have your striker handy. Slowly turn the acetylene regulator in (clockwise) until the gas starts to flow and then light the torch. Adjust the acetylene regulator until the flame has about a 1/4 inch gap between the torch tip and the base of the flame. This is now the proper pressure for the size tip you are using.


Next, open the oxygen knob on the handle 1 turn. Then start turning the oxygen regulator clockwise. Watch the flame as you increase the oxygen flow and adjust until the inner cone in the flame has just become clean and sharp edged. This is a neutral flame. Finally, I close the oxy knob on the handle just enough to get some feathering extending slightly past the inner cone. This is the carburizing flame that I find works well with brazing. Of course, surface prep and other factors will have an impact on your job, but getting the proper flame will go a long way to restoring this fading skill.

News -  Last Call for January!


Probably the next best thing to getting something we desire is an unexpected bonus. That is exactly what has happened for many of the people that have attended my Data Acquisition webinars.

Basically, the webinars cover how to make graphs on the computer and how to interpret and apply what's included on a wide variety of graphs included in data acquisition systems. However, what many people discover is they learn something about their race cars that they never knew before. Even well experienced racers find an unexpected bonus!

Classes start the week of the 9th, so don't miss out and sign up now before it is too late. Click HERE for more info and to sign up.

See you there

Equation of the Month - Cam Math
Time to get back to some engine math! These basic equations can be used to calculate valve opening & closing timing relative to crankshaft position based on duration, separation and installation.







IO BTDC is intake opening before top dead center, IC ABDC is intake closing after bottom dead center, EC ATDC is exhaust closing after top dead center, EO BBDC is exhaust opening before bottom dead center, IDUR is the intake duration, EDUR is the exhaust duration, SEP is the cam's lobe separation and ADV is the installed position of the cam with advanced being positive and retarded being negative. 
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John Block