March Minutes

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alberto
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Joined: August 22nd, 2012, 1:05 am

March Minutes

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The FV Ad Hoc Committee met March 2, 2016
Members Present: Dietmar Bauerle, Steven Saslow, Bruce Livermore Alex Bertolucci
Guest: Fred Clark

GCR Section 9.1.1.C.5.D.11
During the February meeting the Committee reviewed a proposed recommendation to remove, “are included for information only, and” and emphasize “dimensions must be observed” since the language is contradictory. After further review, GCR Appendix G. Facts, Formulas, and Measurement Standards, 2. Measurement Standards, states, “5. Valve size is absolute maximum.” Currently, two difference valve diameters are listed for both exhaust and intake valves. Since valve size is an absolute maximum measurement having multiple sizes that are maximums per Appendix G is redundant and could lead to possible confusion. The Committee agreed to submit the proposed wording as is for a simplification of the rules.

Current wording of 9.1.1.C.5.D.11:
The following standard dimensions are included for information only and must be observed:
a. Exhaust valve diameter: 1.102 or 1.18 inches
b. Intake valve diameter: 1.18 or 1.24 inches
c. Reprofiling of valves is not permitted.

Proposed wording of 9.1.1.C.5.D.11:
The following standard dimensions shall be observed:
a. Exhaust valve diameter: 1.18 inches maximum
b. Intake valve diameter: 1.24 inches maximum
c. Reprofiling of valves is not permitted.

GCR Section 9.1.1.C.5.D.14
The Committee continued the discussion regarding a proposed change to the valve spring rules to eliminate any real or perceived advantage gained by reducing the size of the valve guide bosses. The objective is to set a minimum inside diameter for the lower portion of the valve spring to restrict the selection of valve springs to those that would fit over an unmodified guide boss. Committee members agreed that based on samples measured that a minimum inner diameter (ID) of .840 inches from its base to the top of the first free coil would meet the intent of the rules and would allow heads that have been modified to be used with the appropriate valve springs. The Committee agreed to submit the proposed wording to address circumvention of current rules.

Current wording of 9.1.1.C.5.D.14:
Valve springs are unrestricted providing:
a. No more than one spring shall be used per valve.
b. Any steel spring cap and retainers may be used.
c. Spring shall be made of steel.
d. Valve spring shims may be used.

Proposed wording of 9.1.1.C.5.D.14:
Valve springs are unrestricted providing:
a. No more than one spring shall be used per valve.
b. Any steel spring cap and retainers may be used.
c. Spring shall be made of steel.
d. Valve spring shims may be used.
e. ID of the spring shall be a minimum of .840 inches from its base to the top of the first free coil.

Proposed Engine Case and Head Repair Language and Supporting References
Appendix F – Technical Glossary defines repair as, “To remove the effect(s) of accidental damage to a component, returning it to original or legally modified dimensions and function.” The Committee reviewed existing GCR language regarding repairs in other classes for ideas on how to create language to be used in our class. The Committee brainstormed where on the engine and heads where accidental damage may occur and where repairs may happen. The proposed repair rule language is limited to engine cases and heads since they have a more limited availability than other FV components. Repairs to cranks, rods, pistons, cylinders and etc were not included since they are either wear items or are already adequately covered by available spares, alternatives, etc. Manifolds and carburetors were not included due to the complexity and possible unintended results of allowed repairs to these competitive advantage sensitive components. Overall, the Committee was concerned that any repair language for engine cases and cylinder heads should address that a repair would not change a component shape or original design. In other words, the language would need to address re-machining verses fixing a repair. The Committee agreed to submit the proposed rule addition as currently written.

Proposed Rule Addition: 9.1.1.C.5.D.37
“In addition to repairs and modifications specifically authorized in the FV rules, engine cases and heads may be repaired within the definition of “repair” in Appendix F. “Technical Glossary”. Any such repairs shall provide no competitive advantage and shall not allow the fitment of any alternate part unless specifically authorized in the FV rules.”

GCR Section 9.1.1.C.5.D.6
The Committee continued discussion from February’s meeting regarding engines with pistons that have had material removed from the top – apparently intentionally leaving a non-planer top surface. There was much discussion regarding the practice of measuring deck height. The Committee reviewed proposed language to establish a proper procedure in the rules for addressing deck height measurements and flatness of the piston. Further discussion will be held at the next meeting.

No other issues were discussed.
Next meeting April 6, 2016
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