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| jsup | Oil / Oil pressure | ||
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Elite Guru
 
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So, I think my Oil Pressure is a bit too high. Pins the gauge at startup for a few minutes and typically runs higher than 60 wile driving.
Still has break in oil, thinking of changing it. What is the lightest weight oil available? I'm thinking 0-30..If I put in thin oil, the pressure should drop. And please, don't try to convince me heavier oil is better, you're wasting your time... |
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Posted on: 2008/11/11 18:40
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| Qack | Re: Oil / Oil pressure | ||
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Senior Guru
 
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Just a few thoughts:
Do you know the viscosity rating of your break-in oil? What is your oil pressure at idle when the oil is warmed up? What is your oil temperature? I'd be as concerned about oil pressure at idle than at speed. Are you using a defective or aftermarket oil filter with too high a relief pressure setting? That might might cause the pegged reading on startup. Can you get an independent measure of your oil pressure? Your sender might be bad. For your replacement oil, how about 5W-20 rather than 0W-30 ... I'd rather have the hot viscosity lower rather than the cold viscosity to reduce the oil pressure. |
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Posted on: 2008/11/11 18:53
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| josephf31 | Re: Oil / Oil pressure | ||
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Quote:
What weight are you running now? 5W-30 is the factory recommendation. Have you checked the oil filter for clogging, since you say you have the break in oil still in perhaps the filter is clogged with particles from the build and it's not the oil causing the high pressure? or could it just be tight tolerances, did you just rebuild the motor? |
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Posted on: 2008/11/11 19:29
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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The motor isn't a factory motor.
What is in there is Castrol 15-40. I'm thinking of going 0-30 or 5-30. It's not a stock motor, at all. I like Hastings filters. I think I'm going to change to that. |
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Posted on: 2008/11/11 20:17
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| josephf31 | Re: Oil / Oil pressure | ||
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Senior Guru
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Ah just go to a dry sump system ;-)
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Posted on: 2008/11/11 20:30
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2002 Magnetic Red C5 6 spd LS1 convertible |
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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Quote:
Ah, yes the rabbit hole, still searching for the bottom! |
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Posted on: 2008/11/11 20:31
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| pr0zac | Re: Oil / Oil pressure | ||
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Elite Guru
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i put some 5-20 in my car to start things off.. its at 60 on startup.. that was in the garage for the initial startup out of the cold though. haven't run it really since. i have a high volume pump.
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Posted on: 2008/11/11 22:57
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96 lt4. 357ci, 11:1, LE 226/232, LE2 LT4 heads, ported LT4 intake, EM Gladiator44, EM LT's, stock exhaust, NX kit. |
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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I'm running a high volume pump. It's 10% over stock, some high volumes are 25% over stock..
I figured with the bigger, 7 qt, pan the HV pump would be ok. |
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Posted on: 2008/11/11 23:41
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| pr0zac | Re: Oil / Oil pressure | ||
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Elite Guru
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i have a larger pan also but i think i have the 25% pump. try the 5-20 on the next oil change see how it goes. i drilled a galley plug behind the cam gear also.
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Posted on: 2008/11/11 23:43
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96 lt4. 357ci, 11:1, LE 226/232, LE2 LT4 heads, ported LT4 intake, EM Gladiator44, EM LT's, stock exhaust, NX kit. |
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| bogus | Re: Oil / Oil pressure | ||
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Grand Imperial Pooh-Bah
 
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I recommend K&N oil filters. Very nice pieces.
The 5-30 Mobil 1 (or other synthetic) should be perfect, actually. 15-40 is rather stout, really. |
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Posted on: 2008/11/11 23:49
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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Quote:
I had a leak, and replaced the pan. What happened is where they clearanced the block for the stroked rods leaked by one. He put permatex on the screws, permatex on the pan, put on a new pan, and the leaks stopped. I called and he saie he had 15-40, I agree, kinda heavy. I'll try 5-30 see how it goes, but 8 qts at a time is expensive. |
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Posted on: 2008/11/12 0:13
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| Schrade | Re: Oil / Oil pressure | ||
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Elite Guru
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Quote:
How much assembly lube is in it? One site says their lube is 200 weight equivalent, up to 100'C. |
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Posted on: 2008/11/12 0:16
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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Quote:
See above, break in lube came out with the oil pan change. |
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Posted on: 2008/11/12 0:17
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| bogus | Re: Oil / Oil pressure | ||
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Grand Imperial Pooh-Bah
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Oil weight is a result of internal tolerances.
If you run too heavy an oil in a newer engine, there is a chance the oil won't make it to where it must... and not in the volume needed. Oil weight - ie, heavier - is not better. It is a recipe for disaster if misapplied. |
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Posted on: 2008/11/12 0:21
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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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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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Quote:
I agree, my research when putting this together, is that the lightest oil you can run and maintain 40lbs of pressure, is probably what you should use... I'm going to drain and go 5-30 dino for now. Then synthetic after a few more miles. |
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Posted on: 2008/11/12 0:24
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| bogus | Re: Oil / Oil pressure | ||
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Grand Imperial Pooh-Bah
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the rule of thumb for SBC's is 10 lbs per 1000 RPM.
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Posted on: 2008/11/12 1:39
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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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| flyboy | Re: Oil / Oil pressure | ||
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Elite Guru
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My 91 reads high regardless of oil, say 50 and up, presently using 10w40 Castrol syntec, K&N filter, 46k. There was a service bulletin for 90,91 #91-451A-8C about high readings due to a faulty resistance wire in the pressure sensor.
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Posted on: 2008/11/12 2:16
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'91coupe, LT4Hotcam, some other stuff. If it's too loud, you're too old. "He works on old cars, then junks 'em" |
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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Quote:
Thanks, maybe I'll pick up a sensor, looks easy enough to change, however, don't think that's the problem. It's the same sensor that was reading low on the last motor. I'll remember this as a course of last resort. |
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Posted on: 2008/11/12 2:21
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Parts don't make power, engines make power. |
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| CentralCoaster | Re: Oil / Oil pressure | ||
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Senior Guru
 
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Quote:
Who sells those? I'd like to buy some, it's got my name on it! I've never seen em on the left coast. Definitely avoid the Bogus filters though. |
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Posted on: 2008/11/12 4:11
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| CentralCoaster | Re: Oil / Oil pressure | ||
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Senior Guru
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BTW, what filter is in there now? More filter area is better, so long as the pleats aren't too crowded, like the PureOne. A restrictive filter will give you a higher guage reading and less oil flow.
K&N is ok, but if you want a really good flowing filter, try the Mobil M1-302. It's the same price as K&N, but the can is literally double the size of the Delco filter and a little larger diameter. And if nothing else, it can hold more dirt before it reduces flow or needs changing. BUT, if you have the Z51 sandwich oil cooler, ground clearance and filter puncture from road debris becomes a concern. In which case you may consider the K&N, it's medium length and has a thicker case. Mobil m1-302:  Delco size:  |
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Posted on: 2008/11/12 4:19
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| CentralCoaster | Re: Oil / Oil pressure | ||
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Senior Guru
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In my experience a bad sensor or clogged sensor fitting will cause the guage to hover above zero with the engine off. 1990 at least uses the cheaper sending unit though. |
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Posted on: 2008/11/12 4:27
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| bogus | Re: Oil / Oil pressure | ||
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Grand Imperial Pooh-Bah
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Those are HastingS filters, not Hasting filters... get your names together. I like the K&N filter for two reasons, they are a great filter and they have that cool nut thingy at the bottom for easy removal. |
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Posted on: 2008/11/12 5:53
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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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| CentralCoaster | Re: Oil / Oil pressure | ||
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Senior Guru
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Damn, so I've been spelling my name wrong all these years?
Thanks for the tip Bugos. |
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Posted on: 2008/11/12 6:33
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1985 Z51, ZF6 |
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| pr0zac | Re: Oil / Oil pressure | ||
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Elite Guru
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is that a 2wd truck filter?
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Posted on: 2008/11/12 11:14
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96 lt4. 357ci, 11:1, LE 226/232, LE2 LT4 heads, ported LT4 intake, EM Gladiator44, EM LT's, stock exhaust, NX kit. |
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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Quote:
Having spent high school and college working in hot rod shops, the only difference in those filters is the size. I happen to remember the Fram numbers as being PH13 or PH30. The PH30 is larger, but fits exactly the same. The reason for the short filter on our cars is ground clearance, but either will do. I use the largest filter available that will fit. |
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Posted on: 2008/11/12 13:04
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Parts don't make power, engines make power. |
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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Quote:
I have always liked hastings filters: http://www.hastingsfilters.com/ Find them here: http://www.hastingsfilters.com/support/vendor.html And Baldwin: http://www.baldwinfilter.com/ I've cut them all open in my time, now that may be dated, but it is my opinion these are the best two filters made, if you can find them. |
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Posted on: 2008/11/12 13:08
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| BillH | Re: Oil / Oil pressure | ||
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The Stig Moderator
 
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Quote:
I agree that it could be the sender but I think you should put on a good machanical gauge and see where you're really at. Barring restrictions like the filter previously mentioned, the relief valve spring in the pump could be part of it especially since it's an aftermarket, the higher volume shouldn't make a difference. It's possible that tighter clearences in the motor since it's new but you can only go so tight on any of the bearings. How many miles on the breakin? If it makes any difference, I'm running 5w30 Mobil in my racecar (4cyl) with tight clearences seeing 110 psi cold and 55 hot (drysump), 10 psi at idle. In the vintage nascar motors, we see over 60 psi hot all the time with 5w30 Mobil, no problems. |
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Posted on: 2008/11/12 15:04
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| CentralCoaster | Re: Oil / Oil pressure | ||
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Senior Guru
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I seriously doubt it. I know the PH13 you're talking about, as it's spec'd for my truck. I haven't cut them open but they look visibly different from the bottom. |
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Posted on: 2008/11/12 15:41
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1985 Z51, ZF6 |
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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My part numbers may be dated. That was 20 years ago. My point is that there are multiple filter sizes that will fit. they are of varying lengths.
The insides on the larger filters are different. As I understand it, it is a measure of total surface area inside the filter should be the same. The smaller filters typically do have different guts. That does not make them incompatable in different applications. |
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Posted on: 2008/11/12 15:44
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Parts don't make power, engines make power. |
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| CentralCoaster | Re: Oil / Oil pressure | ||
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Senior Guru
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Yes, but some of them are full of cardboard and leaky check valves.
The refrigeration supply shop has some 10" and 12" long filters, but I don't think they'll clear the driveway.  They use em for filtering oil on large chillers. The threads and oring look like the common gm arrangement. |
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Posted on: 2008/11/12 15:45
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1985 Z51, ZF6 |
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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Well yeah. That goes to manufacture quality.
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Posted on: 2008/11/12 15:49
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| Steve40th | Re: Oil / Oil pressure | ||
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Elite Guru
 
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I use a "PH5" size, which still cross references with NAP Gold/WIX. I have Long Tubes and it is right at the headers.
There are cross references available online. On my LT1 I went to the older style filter with the long tubes for extra filtration, and got rid of that little offset adapter from the factory. |
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Posted on: 2008/11/12 16:12
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Ko'u ohana aia ku'a ikaika |
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| AKS_Racing | Re: Oil / Oil pressure | ||
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Guru
 
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Quote:
I agree with the above statement, but starting at 20 psi at 1000RPM, which leads to 70 psi at 6000 RPM. 10W30 or straight 30W in my cars (but typically use Castrol brand). I run a very nice all metal filter that has a billet shell and flange and allows you to inspect what is actually being captured. It lets you know in advance when something is going away. Aaron |
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Posted on: 2008/11/12 16:43
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| CentralCoaster | Re: Oil / Oil pressure | ||
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Why do the LT1s ask for a different filter than the L98? Seems like you're saying they're interchangeable?
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Posted on: 2008/11/12 16:44
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1985 Z51, ZF6 |
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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Oh, no. I am not saying they are all interchangable.
I am saying from my direct experience, the threads and the gaskets that will mount correctly come in a number of different lengths. And THOSE are interchangeable. There is more than one filter that will fit most engines. The larger ones seem to have less dense concentration of filter materal, the smaller ones have more dense material. However, Gen 1 and Gen 2 small blocks, I do not know if they are interchangeable. |
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Posted on: 2008/11/12 16:57
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| CentralCoaster | Re: Oil / Oil pressure | ||
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I was talking to Steve40th, with the older style filter on his LT1.
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Posted on: 2008/11/12 17:04
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1985 Z51, ZF6 |
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| jsup | Re: Oil / Oil pressure | ||
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Elite Guru
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Quote:
OOPS sorry |
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Posted on: 2008/11/12 17:05
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Parts don't make power, engines make power. |
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| pr0zac | Re: Oil / Oil pressure | ||
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Elite Guru
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the LT1 cars use an offset oil filter adapter and a skinny metric filter to clear the larger factory cats.
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Posted on: 2008/11/12 23:32
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96 lt4. 357ci, 11:1, LE 226/232, LE2 LT4 heads, ported LT4 intake, EM Gladiator44, EM LT's, stock exhaust, NX kit. |
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| Steve40th | Re: Oil / Oil pressure | ||
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Elite Guru
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The LT1's use a little filter as they needed clearance due to the fat catalytic converter. With LT's, am able to use the old style filter adapter and use the 91 and older sized filters.
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Posted on: 2008/11/13 0:11
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Ko'u ohana aia ku'a ikaika |
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| bogus | Re: Oil / Oil pressure | ||
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Grand Imperial Pooh-Bah
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I just use the K&N HP-2001 filter. It's the exact fit on the LT1. Nary a problem.
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Posted on: 2008/11/13 3:17
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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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| BillH | Re: Oil / Oil pressure | ||
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The Stig Moderator
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Me too. |
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Posted on: 2008/11/13 14:26
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