Differences
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techtalk:ref:oil05a [2019/06/04 23:08] hippysmack [Conclusions] |
techtalk:ref:oil05a [2019/06/05 02:47] hippysmack [Conclusions] |
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| When the sump gets wet, the crank sees a lot of resistance due to the oil pooling there. \\ | When the sump gets wet, the crank sees a lot of resistance due to the oil pooling there. \\ | ||
| This generates a lot more heat meeting the power demands while overcoming the added drag of the oil on the flywheels. \\ | This generates a lot more heat meeting the power demands while overcoming the added drag of the oil on the flywheels. \\ | ||
| - | |||
| - | The combination of the added heat and increased pumping to the top end of the motor results in oil pooling on top of the heads that is thinned by the heat. \\ | ||
| - | The combination of pooling and thinner oil with the increased vacume provided by the motor at high RPMs sucks the oil past the valve guides. \\ | ||
| Just adding a cooler may not solve this problem. \\ | Just adding a cooler may not solve this problem. \\ | ||
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| **Coincidence**? \\ | **Coincidence**? \\ | ||
| This mod is not so different than what the MoCo has already done to 92 and up engines. \\ | This mod is not so different than what the MoCo has already done to 92 and up engines. \\ | ||
| - | When the factory got rid of the 86-90 oil pressure regulator, they introduced a oil bleed passage in the oil feed galley of the right case. \\ | + | When the factory got rid of the 86-91 oil pressure regulator, they introduced an oil bleed passage (tiny hole) in the oil feed galley of the right case. \\ |
| This relieves some of the pressure while giving some extra oil to the cam gears by way of splashing #2 cam from the feed galley. \\ | This relieves some of the pressure while giving some extra oil to the cam gears by way of splashing #2 cam from the feed galley. \\ | ||
| + | |||
| + | So, on 92 and up engines, one could also say this mod will add a second pressure relief to the feed oil system. \\ | ||
| + | The jet size for this mod may need to be adjusted for these engines. \\ | ||
| + | (to make sure there is still enough pressure to keep proper oil to the lifters during hot idle or low speeds) \\ | ||
| + | |||
| + | | 98 cam chest. ((photo by isiahstites of the XLFORUM and labeled by Hippysmack http://xlforum.net/forums/showthread.php?t=51598&page=5)) | | ||
| + | |{{:techtalk:evo:oil:98_cam_chest_by_isiahstites.jpg?direct&300|}}| | ||
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