All kart camshaft manufactures can provide, installed height, seat pressure and/or coil bind information to assist in proper set-up of there camshaft. Some of these measurements have been designed to help the smaller engine builder on a limited budget obtain the correct seat pressure without a lot of special equipment.

Coil bind is a measurement that will get your set-up close based on the average spring, valve, valve seat width and engine block. Previous camshaft installations using these numbers can easily be tested without disruption of springs or the original set-up and adjustments could be made to enhance engine performance.

This tester will give you the ability to see actual installed valve spring seat pressure during intial set-up or monitor spring pressure after the engine has been run.

Additional Tips for Using the E-Z Bore Spring Tester:

Older blocks with brass bushing extending into the block used for governor pivot lever will need to be removed. These can easily be removed using a hacksaw blade and cutting untill the bushing is flush with the sidewall. This bushing will interfere with positioning of the pneumatic cylinder during exhaust spring tests.

During intial set-up of valve spring pressure, installing the lower retainer with the notch facing the outside of the breather opening (facing towards you) will allow removal of springs to be quicker when changes need to be made.

Testing spring pressure prior to disassembly of engine will allow you to have a baseline to work from once engine is reassembled. Many factors will change valve spring seat pressure. During refresh of an engine that had been performing well, changing valve springs, valves and cutting seats can alter your original spring set-up and effect the engines performace afterwards.

The E-Z Bore Spring Tester can make some additional checks at the same time valve seat pressures are being performed. Measure total travel of the lifter before the head of lifter bottoms out on the block boss.

Due to the variation in block casting, some blocks will allow the lifter to stay in contact with bottom of the

valve a longer distance before the head bottoms out. This situation would help eliminate excessive pounding to the lifter head, block damage and bouncing of the lifters during float conditions. Running the longest possible legal lifter will help in this area as well.

Coil bind can be checked as well, simply adjust swivel pad on top of pnemautic cylinder down and install approximately .060 thick shim between the lifter tip and the bottom of valve tip. Then adjust pressure regulator untill the spring reaches coil bind. Do Not Apply More Than 55 PSI to Tester During This Operation.

Although this appears to be a simple unit, each unit is assembled and tested by a larger manufacturer for robotic equipment used in automated production. Should your tester become damaged, dropped or require replacement of a component. You will need to send tester assembly back to E-Z Bore for repairs and recalibration. Future plans for this tester will include producing a spring stand that will allow testing of valve spring outside of the engine block, thus creating the need to have each unit recalibrated to produce an accurate pressure reading on your guage. Because of this calibration, you will have the ability to compare spring pressure readings with other engine builders and camshaft manufactures.