Geo-TH,In
Well-known Member
What happens when the cylinder temp of multi cylinder air engines is different, one cylinder is warmer and one is cooler.
If I recall 37cheif has a 4 cylinder inline air cooled Indian. So my question to Chief is what was the draw back to the having 4 cylinders in a row? Did the back cylinder have overheating issues? If so, what kind of engine problems may have occurred?
What about in line V-twins air cooled motorcycles that used one carb? The front cylinder is operated at a cooler temp, back cylinder runs hotter. For combustion to be complete the temp of the cylinders have to be hot enough. So, if the front cylinder is cooler, what may happens to the combustion? Is it possible that front cylinder may have a little carbon build up and the rear cylinder may be warm enough to have complete combustion, no carbon build up? Keep in mind, we are only talking about one carb, so both cylinders are getting the same fuel to air ratio.
Now lets switch to small v-twin engines used on mowers that are cooled by the fins on flywheel. Which is the best, running engine at full speed or less than full speed? Some people think full speed means more air so engine runs cooler. However, full speed means engine burns more fuel which means more heat.
Other people think running at slower speed may mean you will over heat engine because you are lugging the engine, over working it and less air for cooling. So you will over heat the engine.
Which is best wide open or slower? Won't running an engine wide open cause more ring wear?
So, when it comes to small engines what is responsible for valve seats falling out? Valve seat recession? Valve failure? Running too fast or running to slow? Keep in mind most small engines today have EPA compliant carbs, no adjustments. So we have to say the carb isn't the issue related to engine failure.
My last question. Is it possible, that by design, the shroud on V-twins may force more air through one cylinder, cooling that cylinder more than the other? If that happens what happens to combustion? I have a reason for asking all these questions, will post back later.
If I recall 37cheif has a 4 cylinder inline air cooled Indian. So my question to Chief is what was the draw back to the having 4 cylinders in a row? Did the back cylinder have overheating issues? If so, what kind of engine problems may have occurred?
What about in line V-twins air cooled motorcycles that used one carb? The front cylinder is operated at a cooler temp, back cylinder runs hotter. For combustion to be complete the temp of the cylinders have to be hot enough. So, if the front cylinder is cooler, what may happens to the combustion? Is it possible that front cylinder may have a little carbon build up and the rear cylinder may be warm enough to have complete combustion, no carbon build up? Keep in mind, we are only talking about one carb, so both cylinders are getting the same fuel to air ratio.
Now lets switch to small v-twin engines used on mowers that are cooled by the fins on flywheel. Which is the best, running engine at full speed or less than full speed? Some people think full speed means more air so engine runs cooler. However, full speed means engine burns more fuel which means more heat.
Other people think running at slower speed may mean you will over heat engine because you are lugging the engine, over working it and less air for cooling. So you will over heat the engine.
Which is best wide open or slower? Won't running an engine wide open cause more ring wear?
So, when it comes to small engines what is responsible for valve seats falling out? Valve seat recession? Valve failure? Running too fast or running to slow? Keep in mind most small engines today have EPA compliant carbs, no adjustments. So we have to say the carb isn't the issue related to engine failure.
My last question. Is it possible, that by design, the shroud on V-twins may force more air through one cylinder, cooling that cylinder more than the other? If that happens what happens to combustion? I have a reason for asking all these questions, will post back later.