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Post by jackrides on Mar 20, 2019 17:05:27 GMT -5
Anyone ever run across these in 47mm or 50mm bore?
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Post by 90GTVert on Mar 22, 2019 7:03:56 GMT -5
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Post by SMALL CC TEK on Mar 22, 2019 12:19:33 GMT -5
Taida makes one , I would take 90Verts advice here and go oil cooled with external cooler . I have serviced 100's of scooters and i live in Vegas where it gets 112 daily in the summer and as much as 115 /117 for a day or two . Fresh oil changes will extend your scooters life even without the cooler . High quality oil and a external oil cooler would be a nice upgrade on a Qmb139 because your just grabbing a hand full all the time on a 139 . |
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Post by jackrides on Mar 22, 2019 13:12:41 GMT -5
Thanks! I saw an interesting diagram for a elec powered oil cooler. I was wondering if a small 158F coolant thermostat would work at the oil pickup. Thoughts?
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Post by 2stroked on Mar 22, 2019 16:05:53 GMT -5
Thanks! I saw an interesting diagram for a elec powered oil cooler. I was wondering if a small 158F coolant thermostat would work at the oil pickup. Thoughts? Personally, I would just run the closed loop. No T-Stat. I've honestly never seen an oil cooler setup with a TStat, I thought the point was to keep the oil circulating and cooled. Could be wrong.. |
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Post by jackrides on Mar 22, 2019 16:28:51 GMT -5
Only point would be to get a quicker warm up.
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Post by 2stroked on Mar 22, 2019 16:53:03 GMT -5
Eh. I can see that being a point with coolant, but unless you're in a super cold area its not necessary for oil coolers. Even then, using the right oil negates the need.
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Post by GrumpyUnk on Mar 27, 2019 10:02:49 GMT -5
The current oil pump delivers oil to the connecting rod bearing and to the rocker arms. I suggested some time ago that diverting the oil being returned to the sump from the cylinder head through an external finned tube would act as an oil cooler and would cool even better if exposed to airflow when in motion. The oil currently makes its way back to the sump via the cam chain case, I doubt adding much to the lubrication of the chain. Using an external finned, or even plain tube would take the oil out of the heat of the engine, and expose it to cooling air at no extra cost or load on the engine. The use of gravity feed would make likelihood of leakage low as there would be little pressure beyond that of the drain plug or the cam cover. Worth it? I don't know.
I have an expectation that the cooling systems commercially available have a lot of possible leak points, being made up of so many components that must be connected together. Even just adding a twisted section of tubing to connect the two sump drains would add to the oil capacity, and if plumbed, the side with the 'screen' could be set to pull oil from the tube, essentially pulling oil from the drain port on the other side, making the pickup oil travel across the bottom to the pickup. If the tube was finned or maze like, bent into a circuitous route, it would expose quite a bit of oil to cooling air as it was sucked into the pickup. The position on the bottom of the 'pan' or sump would cause oil to naturally fill the tube and make oil available to the pump pickup. This design(in my head) would not require any more openings into the sump, so could be removed without problem. You'd just need something to connect to the pump inlet in place of the spring-held screen assembly. There would also be an increase in the amount of oil available to provide cooling.
tom
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