| 31. | Helmets also have a spring-loaded exhaust valve which allows excess air to leave the helmet.
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| 32. | These actuated the overhead steel intake and exhaust valves.
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| 33. | Each exhaust valve on the J37A4 corresponds to one primary and one secondary exhaust rocker arm.
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| 34. | Also unusual was the adoption of only one hairspring valve spring to close the exhaust valve.
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| 35. | A DOHC design permits a wider angle between intake and exhaust valves than do SOHC engines.
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| 36. | Exhaust valves were sodium filled for cooler operation.
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| 37. | Valve overlap is a secondary means to cool exhaust valves with intake air during valve overlap.
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| 38. | At 4 the exhaust valve opens, and the pressure falls abruptly to atmospheric ( approximately ).
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| 39. | Cylinder deactivation is achieved by keeping the intake and exhaust valves closed for a particular cylinder.
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| 40. | There are three intake and two exhaust valves.
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