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Tool Talk Discussion Forum

How Cylinders Get Oil...?

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Glenn FitzGeral

03-15-2007 09:48:36




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Thank you to all of you who responded to my threads on HF Come-A_Longs and the '93 Bonnieville Charging Problem. I haven't decided yet what I'll do regarding the Come-A_Long. I'll be getting a new alternator for the Bonnieville.

Something I have never known....How do cylinder walls get oiled on a combustion engine? Does the crankshaft splash oil up? I am not aware of it being somehow sprayed on by the oil pump....


Thanks, Glenn FitzGerald

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Jiles

03-15-2007 19:05:13




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 Re: How Cylinders Get Oil...? in reply to Glenn FitzGerald, 03-15-2007 09:48:36  
Different forms of cylinder wall lubrication is used. On most auto engines the oil is supplied by a squirt hole in the connecting rod big end. Depending on the engine configeration,like a v-8, the rod on the opposite side lubes the cylinder straight across from it. In a straight four or six the oil is shot from the piston rod to the piston connected to it. Some diesel engines I have built use sling-off oil from the crank assembly. I have no idea how this is sufficient there is no dipper on the rod, but it works. As someone discussed earlier, the bottom ring is the "Oil Control" ring. This ring DISTRIBUTES oil around the piston. The middle, or second ring from the top, is the "scraper" which does just that to the cylinder wall. This is the ring responsible for oil consumption when worn. All this information may vary from one manufacturer to another but most is standard practice.

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TimV

03-15-2007 12:36:15




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 Re: How Cylinders Get Oil...? in reply to Glenn FitzGerald, 03-15-2007 09:48:36  
Glenn: There are many different schemes for doing this--on most cheap small 4-stroke engines, there is a "dipper" on the crank--just a small flat piece of plastic that splashes oil all over the inside of the crankcase and the cylinder walls. On many 2-stroke engines, the oil/gas mix sprays around the crankcase on its way to the combustion chamber. As you move up in size and price, an oil pump is added, and this pump sends pressurized oil through passages in the crank, cam, block, head, etc. to lubricate the various parts depending on the design of the engine.

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ryanfisher

03-15-2007 11:10:01




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 Re: How Cylinders Get Oil...? in reply to Glenn FitzGerald, 03-15-2007 09:48:36  
i know that on small gas engines, they have an oil control/scraper ring that takes oil squirted on cylinder walls and scraps oil up with piston as piston moves, and what is extra just flows down to the crankcase to be reused later. theres my 2 cents.



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Vern-MI

03-15-2007 10:10:03




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 Re: How Cylinders Get Oil...? in reply to Glenn FitzGerald, 03-15-2007 09:48:36  
There is a squirt hole in the con rod at the crank journal end that sends a squirt of oil up to the cylinders.



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Bob

03-15-2007 09:54:55




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 Re: How Cylinders Get Oil...? in reply to Glenn FitzGerald, 03-15-2007 09:48:36  
Yeah there's lots of oil flying around flung off of the crankshaft/connecting rods from the pressure-oiled journals.

HD turbodiesels even have oil squirter nozzles aimed up at the underside of each piston for cooling.



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