FloridaMan Posted October 4, 2019 Report Posted October 4, 2019 I think I’ll switch to fine wires this annual in the rocket. There are two temperature versions:32 and 36 listed. I think the 32 matches stock temp, but I’m thinking the 36 range plugs may help keep TIT under control for LOP operations with the side effect being higher CHTs and increased risk of detonation at high power settings. Thoughts or suggestions on this?
PT20J Posted October 12, 2019 Report Posted October 12, 2019 I don't understand this at all. Temperature range is a measure of how hot the plug runs, not the engine. 1
philiplane Posted October 13, 2019 Report Posted October 13, 2019 Hotter plugs do nothing but keep themselves cleaner in an oily environment. If you don't have oil fouling issues, you don't need hotter plugs. 1
RLCarter Posted October 13, 2019 Report Posted October 13, 2019 A spark plugs heat range is its ability to transfer the heat of combustion to the cylinder head. Spark plugs have to operate hot enough to burn off deposits to reduce fouling but cool enough to prevent them from glowing and be a source of pre-ignition 4
louisut Posted October 13, 2019 Report Posted October 13, 2019 (edited) While Continental's engine manual specifies 32 or 36, the Rocket's flight manual supplement specifies 32, so I'd go with that. During the last annual, we found 36 fine wires (RHB36S) in the plane. The A&P said hotter plugs can be installed if there are fouling issues or in cooler climates. We replaced them with RHB32S Edited October 13, 2019 by louisut
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