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Post by cdoublejj on Apr 12, 2015 18:32:04 GMT -6
can someone compare the inside of the 150cc gy6 oil pump and the insides of the 50cc oil pump?
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Post by tvnacman on Apr 12, 2015 18:37:20 GMT -6
the outter body and montings are different.
John
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Post by Alleyoop on Apr 12, 2015 18:50:59 GMT -6
As you can see the Oil pumps on a 50 and 150 are quite different. Alleyoop 50cc Oil Pump: Pic #1  Pic #2  150cc Oil Pump:  |
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Post by dmartin95 on Apr 12, 2015 20:32:30 GMT -6
Does anyone know if there is high performance (higher PSI) oil pumps for the GY6 150cc?? I have searched in the past and came up empty handed... Ecotrons has an electric OilPump.. It's intended for use with their with small engine turbo but can also be used to increase oil PSI in General.... Increases the flow to 60L/H.... However, I would like to find a mechanical one. |
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Post by jerryscript on Apr 13, 2015 19:39:29 GMT -6
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Post by cdoublejj on Apr 18, 2015 14:09:15 GMT -6
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Post by cdoublejj on Apr 19, 2015 22:18:50 GMT -6
ssoo either my mine comes with beefier up gears inside or oiling on the 139qmb isn't that bad and synthetic oil will take care of oiling issues .....or the 150cc has some SERIOUSLY sad oiling.
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Post by royldoc on Apr 19, 2015 23:04:56 GMT -6
That is some good information. I did a write up some time back about 50cc oil pumps.
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.
I didn't get around to testing the pump but haven't had any oil issues.
Roy
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Post by dmartin95 on Apr 20, 2015 10:57:44 GMT -6
I just ordered one. Thanks for link! |
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Post by cdoublejj on Apr 20, 2015 14:28:38 GMT -6
I just ordered one. Thanks for link! mine is 10.7 mm or 11.7mm i measured with a mic. not possible to buy 22T pump, they almost don't exist according to normal parts places or eBay. |
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Post by dmartin95 on Apr 21, 2015 12:16:47 GMT -6
Hey Jerry, I've done a little more research about this Koso Oil Pump.... I'm always on a constant hunt to find things like fuel flow, air cfm, stator output and of course of oil flow/pressure.... These kind of "hard numbers" are very hard to come by... So, when I come across them, I get super stoked... Well, thanks to you, I found some more "hard numbers" for the GY6 125cc/150cc. I went to Koso's website to see what info they had published about this high pressure oil pump and in my searching, I found they published a graph showing oil flow ramping with RPM's, and they had stock output as well... Reason they're so important: Using these numbers as a "baseline" to diagnose is an absolutely valuable resource.  Red is KOSO, Blue line is stock GY6 oil pump |
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Post by cdoublejj on Apr 24, 2015 12:34:14 GMT -6
i wonder if there is a way to retro fit one of those ...if it really is any better than stock to a 139qmb. i think it should be a simple as an adapter plate or using the wider gears milling out the stock 139qmb oil pump housing.
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Post by dmartin95 on Apr 25, 2015 11:12:56 GMT -6
i wonder if there is a way to retro fit one of those ...if it really is any better than stock to a 139qmb. i think it should be a simple as an adapter plate or using the wider gears milling out the stock 139qmb oil pump housing. I have no idea. I've never opened up a GY6 50cc (139QMB). KOSO has a good page with product dimensions right here if that will help. |
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Post by cyborg on May 14, 2015 21:17:36 GMT -6
ssoo either my mine comes with beefier up gears inside or oiling on the 139qmb isn't that bad and synthetic oil will take of oiling issues .....or the 150cc has some SERIOUSLY sad oiling. Bingo you win the prize,,,, these engines are made to be in low stressed situations,, and splash Oiling is taken into account,,, I'm surprised they do as well as they do |
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Post by cdoublejj on Oct 11, 2017 15:19:47 GMT -6
i've since learned that a number of small engine have a spring and check ball (single ball bearing ball) in the case somewhere to regulate pressure. i've also learned about Brad Penn oil, they have some specialty oils.
a Friend runs some of their green color oil in his small block drag car. it has a crank case pressure vacuum dry sump system that sucks out all the air and oil and runs @ 9500 rpm, the Brad Penn oil he uses isa high temp oil meant to perform well in oil starved situations.
As you can imagine that might be a perfect fit for a hot running splash oiled gy6. Especially since i didn't tweak the spring or check ball, i might toy with that on the next engine.
EDIT: theory, perhaps hard numbers aren't so easy to find due to the number of variations by the manufacturers out there?
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..BAD TO THE BONE..
