In a message dated 12/16/2000 5:42:45 PM Pacific Standard Time,
jbickford@volcano.net writes:
<<
Tom,
Bruce Johnston had a dial indicator that on engines with the spark
plug hole centered in the cylinder bore, would measure the bore.
It would go through a 12mm and maybe a 10mm spark plug hole.
No need to use the ATF. When Bruce was killed a few years ago, I
don't know if it went to the SCTA or not. Dan Warner may know if it
is still available.
If it has to be CC'd with oil I would have them use 2 stroke or a synthetic
engine oil. The engine will purge that better than the ATF, especially on
turbo motor, less mess.
Jim
>>
Group,
I use a similar device that I saw Elmo Gillette use on the Arduns he and
Jim Lattin ran in the 70's and 80's. It works very well and is made by
cutting a long groove (keyway) in a 12" length of 1/4" or 3/8" steel rod, and
hinging a piece of 1/8" steel rod in such a fashion that when the smaller rod
is placed across the cylinder bore the hinge point with the larger rod is
directly under the spark plug hole.
When the assembly is retracted from the cylinder the small rod folds into
the groove on the larger rod, allowing the assembly to be removed through the
spark plug hole. When placed into the cylinder through the spark plug hole
(piston near bottom-dead-center) the small rod is initially folded into the
larger rod, then folds out to a 90 deg angle with the large rod when the
assembly touches the top of the piston. The two rods are hinged is such a
manner so that their included angle never exceeds 90 deg.
Since the small rod is the exach length as the cylinder bore, once the
operator determines that there is no slack between the smaller rod and the
bore, he measures the smaller rod and verifies the bore.
Stroke is measured directly using a graduated rod or small tape measure.
As was mentioned previously, this method only works on an engine where
the spark plug hole is directly over the bore such as the case is with most
Hemi's.
Ardun Doug King
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