Heat Management system
Road Master
Joined: Dec 2005
Posts: 1,084
Likes: 181
From: Texas
My 2003 NT goes thru:
Phase 1 - At approximately 320˚ F the ECM will gradually reduce engine idle speed until the engine temperature drops or the engine reaches 800 rpm.
Phase 2 - If engine temperature reaches 338˚ F the ECM richens the air/fuel ratio to provide additional cooling.
Phase 3 - If the engine temperature reaches 356˚ F fuel injector pulses are interrupted. The air drawn in and expelled helps cool the engine further. Since there is no combustion it would be perceived as a misfire. This third stage will only happen when the motorcycle is stationary.
Phase 2 - If engine temperature reaches 338˚ F the ECM richens the air/fuel ratio to provide additional cooling.
Phase 3 - If the engine temperature reaches 356˚ F fuel injector pulses are interrupted. The air drawn in and expelled helps cool the engine further. Since there is no combustion it would be perceived as a misfire. This third stage will only happen when the motorcycle is stationary.
Last edited by agapsdiver; Mar 29, 2009 at 09:31 PM.
Cruiser
Joined: Mar 2008
Posts: 209
Likes: 0
My 2003 NT goes thru:
Phase 1 - At approximately 320˚ F the ECM will gradually reduce engine idle speed until the engine temperature drops or the engine reaches 800 rpm.
Phase 2 - If engine temperature reaches 338˚ F the ECM richens the air/fuel ratio to provide additional cooling.
Phase 3 - If the engine temperature reaches 356˚ F fuel injector pulses are interrupted. The air drawn in and expelled helps cool the engine further. Since there is no combustion it would be perceived as a misfire. This third stage will only happen when the motorcycle is stationary.
Phase 2 - If engine temperature reaches 338˚ F the ECM richens the air/fuel ratio to provide additional cooling.
Phase 3 - If the engine temperature reaches 356˚ F fuel injector pulses are interrupted. The air drawn in and expelled helps cool the engine further. Since there is no combustion it would be perceived as a misfire. This third stage will only happen when the motorcycle is stationary.
Road Master
Joined: Dec 2005
Posts: 1,084
Likes: 181
From: Texas
My bike's never gone over 230...
The info I gave is a quote from a HD Tech memo.
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Ultimate HDF Member
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From: Leander Texas
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Ultimate HDF Member
Joined: Oct 2007
Posts: 5,257
Likes: 6
From: Leander Texas
no, it is what i read with ir temp reader at the cooling fins. the chrome top is about 120 to 130. the heat shields are about 120 to 140. the exhaust temp is about 240 to 340. tire temp is about 110 after a ride. the temp reader are bout $20 at the local hobby shop.