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| pappyfreebird | Re: Is this the point where.................... | ||
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Senior Guru
 
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20/50 fer hogs n deisels
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Posted on: 2008/4/6 18:14
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| bogus | Re: Is this the point where.................... | ||
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Grand Imperial Pooh-Bah
 
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I am with Pappy and Casey. Get some thinner oil in there.
Also, where are you traveling? are you coming to LA? |
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Posted on: 2008/4/6 18:32
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| jsup | Re: Is this the point where.................... | ||
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Elite Guru
 
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Quote:
Pleasanton, outside of San Fran. |
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Posted on: 2008/4/7 0:20
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| biggrizzly | Re: Is this the point where.................... | ||
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2011 Memorial Day Car Show Winner!
 
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I just came on your thread here, and I'm not sure if this could be the problem, but when I installed my lifters and pushrods, I initially put a ton of assembly lube on the pushrod ends and in the rocker where the pushrod sits.
Then when I primed the oil pump with the primer and drill, I had a few rockers that were not pushing oil through. I had to remove two of them and use a pick to clear the clog of assembly lube then the oil came out ok. I know that the drill wasn't cranking the pump as hard as it would be with the engine running so I'm not sure if this would even matter with a running engine. Good Luck |
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Posted on: 2008/4/7 2:21
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| CasetheCorvetteman | Re: Is this the point where.................... | ||
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Elite Guru
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60-80psi should be able to push that through if the oil was indeed the correct oil for the job, which 20w50 is certainly not.
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Posted on: 2008/4/7 6:18
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| bogus | Re: Is this the point where.................... | ||
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Grand Imperial Pooh-Bah
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hm... pleasanton is far. oh, well. oh, and get that thinner oil. I would use mobil 1 5-30. |
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Posted on: 2008/4/7 6:20
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| cuisinartvette | Re: Is this the point where.................... | ||
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Elite Guru
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20/50 will pump through there just fine, it has no choice.
Wont hurt anything but a little overkill too. |
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Posted on: 2008/4/8 5:26
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| CasetheCorvetteman | Re: Is this the point where.................... | ||
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Elite Guru
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Its too thick for the task at hand in my opinion. GM dont specify 5w30 cause they think its quicker for them to pour it into the engine at the factory.
If you were operating in temps consistantly exceeding 115*F id consider 10w40, but youre not, so i wouldnt. |
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Posted on: 2008/4/8 7:07
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| bogus | Re: Is this the point where.................... | ||
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Grand Imperial Pooh-Bah
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the wild card here are the LS7 lifters.
Those will have a tough time passing 20/50. |
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Posted on: 2008/4/8 14:31
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| cuisinartvette | Re: Is this the point where.................... | ||
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Elite Guru
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[IMG]http://img.photobucket.com/albums/v224/kalthoff1/dist2021.jpg[/IMG]
instead of arguing viscosity, how about looking at something more in the assembly process, this combined w/installed distrubuter height when using an AFTERMARKET intake might be a better place to begin.........if not tear down would tell the story. An oil pump will pump water or cement, it has no place to go except through the passage( this is assuming the LS7 can be used on this motor in the first place.) May break the pump shaft in the process but a GM lifter not pumping 20/50 through, I would eat a monkeys butt. Neither one of these may be his problem, just a heads up. |
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Posted on: 2008/4/8 16:22
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| CentralCoaster | Re: Is this the point where.................... | ||
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Senior Guru
 
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The viscosity difference between hot and cold oil of the same weight is way way way higher than the difference between 30wt to 50wt.
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Posted on: 2008/4/8 19:19
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| bogus | Re: Is this the point where.................... | ||
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Grand Imperial Pooh-Bah
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Quote:
Are you thinking that the pump isn't being driven correctly? If that is the case, why is the pressure gauge reading 60-80PSI? Now... if it is only reading 80 PSI, then that tells me the oil pressure sender is questionable, and John should get a mechanical gauge on there to be sure the digital is reading right. I know the LS7 lifters are supposed to fit the SBC block. Whether they are a perfect fit? hm... good question. |
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Posted on: 2008/4/9 5:18
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| CasetheCorvetteman | Re: Is this the point where.................... | ||
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Elite Guru
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The oil will follow the path of least resistance. The setup is abit tight for mollassas.
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Posted on: 2008/4/9 7:47
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| CentralCoaster | Re: Is this the point where.................... | ||
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Senior Guru
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20w50 wouldn't cause any major issues in all but the coldest of environments, and even then just on startup.
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Posted on: 2008/4/9 8:09
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| CasetheCorvetteman | Re: Is this the point where.................... | ||
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Elite Guru
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But why use it? The engine calls for 5w30. I dont understand why youd want to use something so thick. It makes no sense at all.
Dont tell me its cause you only use the car in warm weather, cause 70*F is NOT warm weather, its cold weather. 90*F by 9am is warm weather. |
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Posted on: 2008/4/10 6:45
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| Midnight85 | Re: Is this the point where.................... | ||
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Guru
 
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Case, you are right about jsup not needing the heavy oil but Central Coaster is also right about it not causing jsup's problem. 5w30 is okay on a new or low mileage engine but as engines age they gain some clearance, also an engine built to perform above stock guidelines is built with more clearance so there is where the heavier oil comes into play. I used to race a 350 powered Vega and it was built to run so it had more clearance, I used straight 50 weight back then and NEVER lost an engine or scuffed a bearing. However, once when the oil pump pickup fell off the engine starved at 8000 rpm, damn, what a mess that was getting that 50 weight off the track.
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Posted on: 2008/4/10 14:52
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