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techtalk:ref:oil10 [2024/01/28 06:19] hippysmack [Sit Sumpimg] |
techtalk:ref:oil10 [2024/01/28 07:00] hippysmack [Sit Sumpimg] |
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| The most notable symptom of sit sumping is a loss of oil in the oil tank after the bike sits for a while. \\ | The most notable symptom of sit sumping is a loss of oil in the oil tank after the bike sits for a while. \\ | ||
| This is where some make the mistake of adding oil to a cold oil tank to get the level between the hashes on the stick. \\ | This is where some make the mistake of adding oil to a cold oil tank to get the level between the hashes on the stick. \\ | ||
| - | Adding oil to a cold motor is never a good idea. [[techtalk:ref:oil01|Click Here]] for the checking/adding oil page in the Sportsterpedia. \\ | + | Adding oil to a cold motor is never a good idea. [[techtalk:ref:oil01|Click Here]] for the checking/adding oil page in the Sportsterpedia. \\ |
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| + | There isn't much oil pressure on the feed side of the oil check with the motor not running. \\ | ||
| + | For example using Mobile 1 V-twin 20w50, app head pressure at the oil pump was calculated to be just less than 1/4 PSI on a 98 1200S. \\ | ||
| + | This figure will change slightly depending on your current altitude above sea level, oil density and height of oil in the tank. But just for argument sake.. \\ | ||
| + | And subtracting say 60-70% of that going back up to the oil filter pad leaves very little pressure against the oil check. \\ | ||
| + | [[techtalk:ref:oil21#oil_tank_head_pressure|Click Here]] to read more on calculating oil tank head pressure in the Sportsterpedia. \\ | ||
| + | The OEM spring behind the check ball keeps pressure at 4-6 PSI against the ball to it's seat according to the manuals. \\ | ||
| + | And doing the math, there should be less pressure on the incoming side of the check ball than spring seat pressure. \\ | ||
| + | Meaning there shouldn't be enough gravity oil pressure when shut down to overcome the check system. \\ | ||
| + | However, we know oil will leak down into the motor during shut down and for reasons below or more. \\ | ||
| When you start the engine, the excess oil in the crankcase can end up being fired out the breather(s), onto the floor, (or into your air-filter on 79-up models). \\ | When you start the engine, the excess oil in the crankcase can end up being fired out the breather(s), onto the floor, (or into your air-filter on 79-up models). \\ | ||
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| This one on a 2005 Sportster has the ring indention but it has not mushroomed and does seal. \\ | This one on a 2005 Sportster has the ring indention but it has not mushroomed and does seal. \\ | ||
| {{:techtalk:ref:oil:2005_sportster_oil_pump_check_ball_-_ring_indention_by_rdhenley.jpg?direct&400|}} ((photo by RDHenley of the XLFORUM)) \\ | {{:techtalk:ref:oil:2005_sportster_oil_pump_check_ball_-_ring_indention_by_rdhenley.jpg?direct&400|}} ((photo by RDHenley of the XLFORUM)) \\ | ||
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