Cylinder head temps vrs Exhaust gas temps
Capt. Quirk
Posts: 872
Hover1,
I like my head temps to stay around 300 degrees f, 330' for best power, by 350' I am getting worried that the engine is headed towards no longer dissipating heat properly. When you start your engine, your cht should be nearly 250' in a second or·at the same rate your egt's do (if you are measuring under the spark plug).
On a well tuned engine, head temps shouldn't vary much. Maybe thats why they people think its slow. On all my testing, head temp reflects a mixture change right away, unless the engine is heat soaked.
When it comes to egt's, their is no universal setting that works. On 2-strokes this is largely·caused by BDT (blow down timing), and to a lesser degree,·transfer port angles·and the exhaust port shape that contribute to short circuiting, and the mixing of spent gasses.·However, the type of exhaust system that is used is generally a decent way to·assume BDT.
Bill M.
Post Edited (Capt. Quirk) : 7/25/2010 4:07:40 AM GMT
I like my head temps to stay around 300 degrees f, 330' for best power, by 350' I am getting worried that the engine is headed towards no longer dissipating heat properly. When you start your engine, your cht should be nearly 250' in a second or·at the same rate your egt's do (if you are measuring under the spark plug).
On a well tuned engine, head temps shouldn't vary much. Maybe thats why they people think its slow. On all my testing, head temp reflects a mixture change right away, unless the engine is heat soaked.
When it comes to egt's, their is no universal setting that works. On 2-strokes this is largely·caused by BDT (blow down timing), and to a lesser degree,·transfer port angles·and the exhaust port shape that contribute to short circuiting, and the mixing of spent gasses.·However, the type of exhaust system that is used is generally a decent way to·assume BDT.
Bill M.
Post Edited (Capt. Quirk) : 7/25/2010 4:07:40 AM GMT