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Preferred pronoun:Maestro
Join Date: Sep 2012
Location: Group W Bench
Posts: 11,351
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Oil Circulation - New Engine
Hoping to finally find time to install my freshly built engine this weekend.
In the interest of finding oil leaks before installing it (and assuring oil circulation), I mounted the oil tank next to the engine, filled it with oil and cranked the engine. Sure enough, there's oil moving and no obvious leaks. I disconnected the turbo oil feed line at the top rear, in addition to the left and right cam feeds and saw what appears to be a good flow of oil at each point. Since I suspect these are some of the last places to receive lubrication I'm feeling pretty confident. However, when I removed the oil filter it was dry as a bone. I haven't cranked the engine for more than a few seconds at a time, and have done so only 6-8 times total. Also, not having a proper fitting adapter, I was not able to check actual oil pressure although, as I mentioned, there seems to be a good volume. Should cranking alone provide enough pressure to reach the filter? If so, should I sustain the cranking longer (say, 30 seconds)? I know that's not good on the starter but I think I'm more interested in making sure that things are in order oil circulation-wise than I am in overheating the starter, Your input, ideas or suggestions are always welcome.
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When in doubt, use overwhelming force. |
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03-12-2015, 08:34 AM
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Your filter is the last place to receive oil. When you have oil returning to the tank it is flowing thru the filter.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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03-12-2015, 01:13 PM
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Join Date: Oct 2010
Location: Southern NH
Posts: 3,553
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03-12-2015, 02:11 PM
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Banned
Join Date: Nov 2007
Location: Rockwall, Texas
Posts: 8,559
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Oil does not flow to the tank mounted filter until the oil temp comes up enough to open the engine mounted thermostat, correct? In other words, no amount of cranking is going to send oil to the filter. BTW - "mount and crank" sounds like something Paul does as his favorite, alternative lifestyle bars!
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03-12-2015, 02:27 PM
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Registered User
Join Date: Oct 2010
Location: Southern NH
Posts: 3,553
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Wow, that's a dumb ass design. I knew that was the case with my 993 filter mod, but I figured that was because I was removing the oil cooler and running the filter in it's place....
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03-12-2015, 02:57 PM
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Registered
Join Date: Jul 2006
Location: S. Florida
Posts: 7,249
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The engine oil pump is two seperate gear type oil pumps in one overall housing that comes apart in sections.
The scavange pump side sucks up oil from the bottom of the engine case and pumps it to the external thermostat where when cold it goes directly to the oil tank and goes through the oil filter and then drains into the oil tank after flowing through the filter. When hot the external thermostat switches the oil delivery to the external engine oil cooler in the front right wheel well first or any other external oil coolers someone has installed. Then it comes back to the oil tank where it goes through the oil filter and drains into the oil tank from it. The main engine oil pressure pump sucks oil from the oil tank through the thick "S" hose and pumps it under pressure through the internal thermostat where when cold it goes directly to oil galley feeding the main bearings and connecting rod bearings and out the opposite end of the case to the oil fed chain tensioners and the cam towers to feed the cam journals and cam spray bars. When the oil is hot the engine thermostat sends the oil through the engine mounted oil cooler first and then to the oil galley in the case. edit: Just saw the post before me and when you actually understand it you will see it is an EXCELLENT dry sump design born from racing. Last edited by JFairman; 03-12-2015 at 03:17 PM.. |
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03-12-2015, 03:14 PM
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