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techtalk:ref:engmech04g [2019/11/14 06:32] hippysmack [Slack tube testing on a 1998 1250S model] |
techtalk:ref:engmech04g [2020/01/31 15:06] hippysmack [Test with air cleaner removed] |
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An addition of 3" of positive pressure exerted (6" in actual height) on downstroke still yields a balance of 6" of total vacuum from the engine (showing 3” on left leg). \\ | An addition of 3" of positive pressure exerted (6" in actual height) on downstroke still yields a balance of 6" of total vacuum from the engine (showing 3” on left leg). \\ | ||
In this example, the total pressure in the crankcase is still negative but with not as much pressure as it was at the last upstroke. \\ | In this example, the total pressure in the crankcase is still negative but with not as much pressure as it was at the last upstroke. \\ | ||
- | {{:techtalk:ref:engmech:1slack_tube_figure_d_by_hippysmack.jpg?direct&400|}} \\ | + | {{:techtalk:ref:engmech:slack_tube_figure_d_by_hippysmack.jpg?direct&400|}} \\ |
For this testing, a slack tube was made using an 1/8" hose barb fitting plugged into the timing plug hole with a length of 1/8" clear hose to the instrument. \\ | For this testing, a slack tube was made using an 1/8" hose barb fitting plugged into the timing plug hole with a length of 1/8" clear hose to the instrument. \\ | ||
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===== Test with air cleaner removed ===== | ===== Test with air cleaner removed ===== | ||
- | The A/C was removed to se if it had any impact on crankcase pressure testing. \\ | + | The A/C was removed to see if it had any impact on crankcase pressure testing. \\ |
There was no noticeable difference with it off through the RPM range tested up to 5000. \\ | There was no noticeable difference with it off through the RPM range tested up to 5000. \\ | ||
There was also no noticeable oil mist during this period. \\ | There was also no noticeable oil mist during this period. \\ |