Re: 1973 50hp lark Compression Question
Don;t even consider 100-l. There is no way that engine held pressure for an hour. I have a leak-down tester, and use it often, in fact every time I test an engine Even on the very best engine, when you fill the cylinder with air, and shut the inlet valve off,it will will drop to zero pressure in probably less then 15 seconds. If he said it held pressure for an hour, ask him to do again while you watch. I would like to watch! The dyno is a high pressure oil pump. The pump itself has different adapters to fit the prop shaft of what ever motor you are working on. The pump has rubber coated braces that hold against the cavitation plate to lock it in place. It also has a high capacity tank of oil to pump into, to keep the oil cool. There is a valve to adjust the pressure up, and down. You start the engine, and adjust the pressure to load the engine. You run the engine at WOT, and see how much pressure the pump will build without going over the engine maximun rated rpm. There is a chart that comes with this tester that tell's what the ideal pressure should be. This tool is not considered a true dyno, as it will not read true horse power. Needless to say, the noise is horrendous when you have such as a v-6 at full throttle out of the water.
Don;t even consider 100-l. There is no way that engine held pressure for an hour. I have a leak-down tester, and use it often, in fact every time I test an engine Even on the very best engine, when you fill the cylinder with air, and shut the inlet valve off,it will will drop to zero pressure in probably less then 15 seconds. If he said it held pressure for an hour, ask him to do again while you watch. I would like to watch! The dyno is a high pressure oil pump. The pump itself has different adapters to fit the prop shaft of what ever motor you are working on. The pump has rubber coated braces that hold against the cavitation plate to lock it in place. It also has a high capacity tank of oil to pump into, to keep the oil cool. There is a valve to adjust the pressure up, and down. You start the engine, and adjust the pressure to load the engine. You run the engine at WOT, and see how much pressure the pump will build without going over the engine maximun rated rpm. There is a chart that comes with this tester that tell's what the ideal pressure should be. This tool is not considered a true dyno, as it will not read true horse power. Needless to say, the noise is horrendous when you have such as a v-6 at full throttle out of the water.