Quote:
Originally Posted by X-TECH MAN
One more thing to remember.....not all dial indicators measure the same. When I worked for the Dept. of the Navy I used to calibrate all kinds of precision tools. The standard or tolerance of a dial indicator is plus or minus .001 (one thousanth) of an inch. Some "OFF BRANDS" are allowed .002 plus or minus so use a quality brand such as Starrett or Brown and Sharp. If you check dead on at home there is always a chance you could be one over during tear down. Its best to be a few thou. under to be safe. A couple of thou wont make your run faster but it could get you DQed.
Same deal when C C'ing your chambers and runners. ALWAYS use a certified burette and rubbing alcahol with some food coloring in it and check your heads while at room temp. Hot cylinder heads could make your chambers come up a little short if your close to begin with.
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Totally agree with Terry on the burette & fluid issue. First time I tore down my Mustang in 2004, I ended up .4 of 1cc shy on combustion chamber volume. To their credit, the NHRA Tech guys let me clean any carbon from the piston top, and re measured it several times, but it kept comimg up short. Turns out the alcohol my machinest buddy used in his berette was dollar store stuff, between that, and changing the spark plug heat range, it put us under the min spec. Got disqualified, and had to leave the track without getting any money back, and had to arrive with the heads off at the next race for inspection, before being able to compete again. We just had to sink the valves a tad to get back in spec, but the embarrassment of being caught "cheatin`" was no fun at all. The teardown was entirely expected too, as we were setting a record that had been at a minimum for some time, so obviously we THOUGHT that everything was on the up & up.As Mike Carr mentioned, that never would have happened at a bracket race!