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Post by royldoc on Aug 4, 2013 13:10:36 GMT -6
There is no difference in the two engines. The "P" designates that it is a horizontal cylinder. Some manufactures stamp the "P" in the engine code and some don't. I have 4 of these engines and two of them are stamped 1P39QMB and two of them are stamped 139QMB.
The first digit designates the number of cylinders:1=1 cylinder
The next letter designates the lay out of the cylinder: P= horizontal, V=v type, Blank=vertical. Some manufactures do not stamp this digit as all 139QMB, 1P39QMB engines have a horizontal cylinder.
The next two digits designate the bore size: 39= 39mm bore
The next letter designates the type of cooling: Q= forced air
The next letter designates engine use: M=motorcycle
The last letter designates cc size: B= 50cc
None of my engines are stamped at the rear of the case with 5B or 6B. The engines may or may not be stamped.
Hope this helped.
Roy
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Post by royldoc on Jul 29, 2013 8:53:30 GMT -6
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Post by royldoc on Jul 28, 2013 0:02:42 GMT -6
I'm going to do an experiment to see if I can get more oil flow out of an oil pump that uses a 22 tooth drive gear and a 47 tooth driven gear, as it is the oil pump turns at a ratio of 2.1363:1 I am going to try to use a drive gear of 16 teeth and a driven gear of 33 teeth. This will turn the pump at a ratio of 2.0625:1. The difference isn't a lot but it should help with oil flow. I am going to try to press the shaft out of the 47 tooth gear. These gears are made with the steel hub and shaft molded into the plastic. It may not be possible to press out if the shaft and hub are one piece. If this is the case it will destroy the plastic gear and i will turn the hub down even with the shaft on a lathe. I will next drill the center of the 33 tooth gear so that the shaft from the 47 tooth gear will press into it. I will do this on a mill as the hole in the center is not round, but has two flat sides. A regular drill may wander and make the hole to large for the shaft to be a tight fit, or it may end up out of center. Then I need to make a test rig to mount the pumps to so I can test the flow rates and pressure of the pumps. I bought extra gears and pumps Just to try this.
Roy
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Post by royldoc on Jul 21, 2013 1:27:40 GMT -6
I am thinking it may be possible to drill out the center of a 33 tooth gear and press the shaft from a 47 tooth gear in it. I need to order a spare 47 tooth gear though. If not I will have a shaft made at my local machine shop. This will allow me to use the pump with thicker gears turning at the faster ratio. I would prefer to use the shaft from a 47 tooth pump, because the end of the shaft is supported by the case cover. The shaft from a 33 tooth pump has a threaded end and the gear is held on by a nut, so it cant go into the hole in the case cover and is not supported.
Roy
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Post by royldoc on Jul 15, 2013 0:08:29 GMT -6
Hello,and welcome to the clinic.
Roy
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Post by royldoc on Jul 14, 2013 3:40:16 GMT -6
is there such thing as a high volume oil pump for 139qmb if so do they really work? I'm not sure, but don't think so. I have only found two different oil pumps. one uses a 16 tooth drive gear on the crankshaft and a 33 tooth driven gear on the pump, it turns at a ratio of 2.0625:1. This pump has internal gears that are 8.75mm thick. The other pump uses a 22 tooth drive gear on the crankshaft and a 47 tooth driven gear on the pump, it turns at a ratio of 2.1362:1. This pump has internal gears that are 10mm thick. The internal gears of the pump are the same diameter and have the same number of teeth. I haven't tested the difference in flow of the two pumps, but I think it will be about the same. Even though the first pump turns a little faster the internal gears are thinner. The second pump turns a little slower, but the internal gears are thicker. The thinner gears will move less volume but turn faster than thicker gears. If the two pumps had the same size drive gears and driven gears and they turned the same rpm the pump with thicker gears would have a greater flow. |
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Post by royldoc on Jul 11, 2013 23:45:39 GMT -6
How did my problem with these two computers turn into a Chinese product bashing thread? As I stated earlier the products in question were made in Taiwan. All the other parts that were made in china still work. Bashing Chinese cheap stuff was not the purpose of this thread.
Roy
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Post by royldoc on Jul 9, 2013 23:13:33 GMT -6
The motherboards in these two computers were made in Taiwan. The first one is about 1 year old and the second is about 5 years old. So it was time to upgrade anyway. I have a laptop I bought in 98 and it still works. That is the one I use to tune my efi system because it has serial ports, newer computers don't have them anymore. This particular laptop I am using now had a broken screen and was only about 6 months old. I bought it cheap and replaced the screen. Roy |
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Post by royldoc on Jul 9, 2013 12:00:06 GMT -6
Doesn't it seem like every time things are going ok something happens? It does to me. About a month ago my gaming computer took a voltage spike and zapped the mother board, even though I use good surge protectors. (major bummer as this is a custom built high end computer.) So I have been using a secondary computer.( this none is no slouch computer either) Well last night when I got home and turned it on I got no video signal. I tried several new video cards and switched monitors ect, no go. So now I am reduced to using one of my lap tops. (I hate laptops and this one has vista on it and I hate it even more) Any way now I gotta go computer parts shopping so I can rebuild two new computers. And it ain't gonna be cheap.  Roy |
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Post by royldoc on Jul 9, 2013 11:43:49 GMT -6
Sure Rich, you can move this if you want.
Roy
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Post by royldoc on Jul 8, 2013 10:35:58 GMT -6
I'm going to stick a couple of thin strips of foam to the camera, that should hold it tight in the housing and eliminate the rattle. I am also going to get another case to try some mods for an external mic and buttons.
Roy
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Post by royldoc on Jul 8, 2013 8:29:02 GMT -6
The image stabilization was one of the selling points for me over the gopro. Plus it is about half the price of the gopro black.(I still want one though) Sony is fairly new to the action cam scene and there is some flaws with this camera. Such as the not so well thought out case, the buttons and navigating through the menu. But it is a good little camera and will suit my purpose. You cannot use the image stabilization in wide angle mode, but it still takes a pretty wide picture. Hopefully sony will redesign these with a new model
Roy
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Post by royldoc on Jul 8, 2013 0:48:37 GMT -6
This is about a six minute video of a test ride with my new Sony action cam mounted to the scooter. The annoying clacking noise you hear is not the valves, it is the camera rattling in the protective housing. I'm still learning how this camera works, editing, uploading ect. and any help is appreciated. I'm good at mechanical stuff but this technical stuff takes me forever to learn. Here is the link to the video. This is how I mounted the camera.   Roy |
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Post by royldoc on Jul 7, 2013 22:56:27 GMT -6
Will the 11 pole stator work with the 8 pole magneto? What is the bolt hole spacing?
Roy
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Post by royldoc on Jul 7, 2013 22:53:19 GMT -6
Thank You John.
Roy
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