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On head
valve spring tester FAQ
Q
: What makes the Buxton Engineering on head valve spring tester
better than the rest ?
A: Other on head testers on the market measure the down force
applied directly over the spring. (see fig below)
What they don't measure is the upward force applied to the push
rod side of the rocker arm.
This
upward force counteracts the downward force. The end result, can produce false readings of as much as
100 lbs. depending on the
rocker arm length and design. Our patented design combines both
forces to give a very accurate reading.
Q:
Other manufacturers advertise .XX% accuracy. Is this true ?
A:
Yes and no. The load cell or measuring device may be accurate
within .XX%, but the unit as a whole is not. We have done a
substantial amount of testing, and our unit is a true 2%. On a
300 lb. spring that would only be ± 3 lbs.
Q:
If the tester is dropped, or looses calibration, do I have to
return it to Buxton Engineering for re-calibration?
A:
No, included in the instructions is a step by step procedure for
re-calibration.
Q:
Will your tester work on stud mounted rockers ?
A:
Yes, it will work on shaft or stud mounted rockers.
Q:
I don't have much space between the valve cover rail and rocker
arm. How much space do I need ?
A:
The rocker arm latch has a very thin profile. You only need about
3/16ths of an inch.
Q:
Will your tester work on offset rockers ?
A:
It will work on offsets as much as 1", depending on the
manufacturer of the arm.
Q: Is the
adjustment on the side of the tester for different rocker ratios ?
A: No, the
adjustment is for the rocker arm pivot length. (the distance between the shaft
or trunion and the roller tip) For example on a small block Chevy you can
have two different ratios but they both will have the same pivot length.
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