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Post by triker on Aug 9, 2013 1:47:48 GMT -5
There are two different oil pumps for a 139qmb engine. One pump uses a 47 tooth driven gear and a 22 tooth drive gear on the crankshaft. The second pump uses a 33 tooth driven gear and a 16 tooth drive gear on the crankshaft. The first pump turns at a ratio of 1:2.1363 and has internal gears that are 10mm thick. the second pump turns at a ratio of 1:2.0625 and has internal gears that are 8mm thick. The first pump has thicker gears and would move a greater volume of oil if both pumps turned at the same ratio. The drive gears on these two pumps are not interchangeable. I have taken the shaft out of a 47 tooth gear and machined the hub that was imbedded into the plastic gear off. I then bored the hole in the center of a 33 tooth gear and pressed it onto the machined shaft. The crankshaft I have has a 16 tooth drive gear and I can now use the pump with thicker gears turning at the faster ratio of 1:2.0625. This should increase oil flow volume and pressure. I have not tested this yet, but I will do a test on oil flow volume and pressure at given rpms for the two stock pumps and the pump with the modified gears.
Roy
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Post by sailracer on Aug 9, 2013 5:23:09 GMT -5
WHY? were you having a problem?the gains you would get are negligible for the amount of oil in the sump. I would just leave well enough alone JMO
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Post by rockynv on Aug 9, 2013 9:47:31 GMT -5
It may work out however with the plastic gears you are taking a chance that the increased pressure can can cause them to strip driving the higher volume pump faster then it was originally setup to run. This will be more of an issue if you are running oil thicker than specified for your climate or if you don't allow the engine to warm up a bit before starting off.
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Post by sailracer on Aug 9, 2013 18:10:40 GMT -5
DX
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Post by triker on Aug 10, 2013 0:21:25 GMT -5
WHY? were you having a problem?the gains you would get are negligible for the amount of oil in the sump. I would just leave well enough alone JMO No, I am not having a problem. I am just trying to figure a way to move more oil so that in the future I may just try to install an oil cooler. I have as yet to see an engine that didn't benefit from a higher oil flow. Even with a small amount of oil in the sump the oil still removes heat from the engine parts. You can leave well enough alone if you want to, not me. New and better stuff would never be found if everybody just left well enough alone. Roy |
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Post by triker on Aug 10, 2013 0:26:16 GMT -5
It may work out however with the plastic gears you are taking a chance that the increased pressure can can cause them to strip driving the higher volume pump faster then it was originally setup to run. This will be more of an issue if you are running oil thicker than specified for your climate or if you don't allow the engine to warm up a bit before starting off. These plastic gears are very tough. The extra stress, if any the little bit thicker gears in the oil pump will be minimal. I do not think it will be a problem. Roy |
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Post by sailracer on Aug 10, 2013 1:17:55 GMT -5
WHY? were you having a problem?the gains you would get are negligible for the amount of oil in the sump. I would just leave well enough alone JMO No, I am not having a problem. I am just trying to figure a way to move more oil so that in the future I may just try to install an oil cooler. I have as yet to see an engine that didn't benefit from a higher oil flow. Even with a small amount of oil in the sump the oil still removes heat from the engine parts. You can leave well enough alone if you want to, not me. New and better stuff would never be found if everybody just left well enough alone. I see the point if you are adding a cooler, without one , you are just moving hot oil around faster, with less time to"sit" and cool a little |
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