Brownie

Thanks Jason (again <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ).

What kind of pressure do you see at those rpms?

I am going to have the oil pump swapped out. I'm not going to risk the bottom end.

I contacted the shop and they were very cool about it. They also thought it was low and will swap it out for me as soon as I can get the car to them.

I can't wait, this thing sings at high rpm. Soooo much fun!! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> And so driveable too!

Later,

Mike

Reboot

iTrader: (5)

Mine was low after a cam swap, it seems they didn't get all if the cam lube off before it was installed. Once I changed oil and filter the pressure cam back up to above 40 at idle and 60 under acceleration.

Jason99T/A

iTrader: (21)

Mike, I see about 70psi at idle on a cold start and it is nearly pegged driving around in the mornings. Once the car is warm, at idle it is around 55psi and about 65psi driving around. At WOT, it is very close to pegged. I'm still running a stock GM oil pump.

I'm glad you are enjoying the new setup! Once you get everything sorted out, get some dyno numbers. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Jason

Brownie

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Jason99T/A:
<strong>Once you get everything sorted out, get some dyno numbers. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Jason</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Thanks Jason.

Dyno Numbers: (done before I picked up car)

412rwhp/394rwtq SAE corrected

dynoed in high 80s to low 90s and very humid weather.

3.42 gears, six speed, stock ws6 wheels at 28 psi

Not too bad, was hoping for a little more but can't complain. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Mike

Brownie

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Reboot:
<strong>Mine was low after a cam swap, it seems they didn't get all if the cam lube off before it was installed. Once I changed oil and filter the pressure cam back up to above 40 at idle and 60 under acceleration.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Thanks, I am currently doing just that. I didn't really understand why it would make a difference, but now I do. If they used pre-lube on the cam during the install (which is good for the cam and bearings) then I could be suffering the same fate.

Thanks,

Mike

Brownie

I just recently had a heads/cam done on my car along with a ported oil pump. My pressure seems too low to me now and I am more than concerned.

Please let me know what you think.

I'm currently using dino oil 5w-30.

When I start it cold it stays around 40 at idle.

I idle at 950 and when fully warm pressure is about 22 psi. When I am driving around casually 1500-3500 rpm the pressure is about 37 psi. When I get on it the pressure is about 50 psi and no higher. I have taken the car up to 6400 a couple times and never reach over 50 psi.

I will no longer take the car above 4500 since I only get 50 psi.

I seems to me I should have more pressure at idle and definitely more pressure above 4500 rpm (maybe 60+ psi).

Your help is greatly appreciated.

I am thinking of having the new oil pump replaced since I am more than nervous (should I be?).

Thanks,

Mike

Jason99T/A

iTrader: (21)

Hey Mike, I'm glad you got the heads/cam installed!

Your oil pressure is low, especially for one of the modified units. I would talk to the guys who did the install and see what they have to say. If you are in doubt, change it out. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Jason

Brownie

Changed the oil and filter but it only gave me back about 5-7 psi.

Oil pressure maxes around 58 psi when wot and above 4000 rpm but will never exceed it.

Idles around 30 psi and drives around 42.

It will be a week or two until this can get rectified.

Am I endagering the motor by running this psi???

Any ls1 oil pressure experts out there????

Should I cap running the motor only to 5500-6000 rpm? (10 psi per 1000 rpm)

Can't afford to blow this motor. Need a year or so to save for a bottom end build up.

Since I am not that familiar with what it takes to starve these motors for oil and spin a bearing or worse...

Your help is greatly appreciated!

Thanks,

Mike

akw408

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Brownie:
<strong>Changed the oil and filter but it only gave me back about 5-7 psi.

Oil pressure maxes around 58 psi when wot and above 4000 rpm but will never exceed it.

Idles around 30 psi and drives around 42.

It will be a week or two until this can get rectified.

Am I endagering the motor by running this psi???

Any ls1 oil pressure experts out there????

Should I cap running the motor only to 5500-6000 rpm? (10 psi per 1000 rpm)

Can't afford to blow this motor. Need a year or so to save for a bottom end build up.

Since I am not that familiar with what it takes to starve these motors for oil and spin a bearing or worse...

Your help is greatly appreciated!

Thanks,

Mike</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">This is very interesting. I have an ARE ported oil pump and also an ARE built motor.

My oil pressure when the motor was still breaking in was probably about 5psi or so higher than it is now. Now, at idle, the pressure is around 28-32psi, oil temp at around 210F and using 5W-30 synthetic. When driving around, it is in the mid 40s. With some gas, but not WOT, I see 50s and low 60s? I need to check to see what it is at WOT, but usually I am too focused on the road. I'll let you know what it is, but I don't think 58psi is any cause for concern. Maybe you could try a heavier oil weight? 10W-30? I plan to switch to a heavier oil weight for my next oil change.

Brownie

akw408,

That is interesting. When I did my oil change I went to 10w-30 (see above post for result).

From what I have been told after talking with a couple sponsors, this pressure it toooo low.

The ls1 motor needs atleast 10 psi per 1000 rpm and should really be above that. I was told that the ls1 motor needs oil pressure to keep the bearings (main and rod) safe especially a higher rpms.

Sounds like 6600 rpms probably should be around 70+ psi.

Just wanted you to know.

Mike

tigertat

I have just experinced this with my cam install. I will be taking the pump off to check the "o" ring on the pickup tube, that is where the prob is I think. If you take the car back though let us know what they tell you it is.

TRYMYZ

iTrader: (2)

I have the same problem. I posted about a month back, but got limited responses. Hopefully someone will come up with a solution or answer.

John

akw408

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Ls1 382ci SS:
<strong>Wow, looks like I am not the only one. I just got my 382 all bore from ARE installed with the modded oil pump and my oil pressure is too low. I got the car yesterday and quickly changed the oil and filter. same thing. at idle the psi is at about 40 and when driving around it does go up depending on the rpm normally. what concerns me is that when driving and at a light the oil pressure goes to about 20-22psi and that is scary. I will take it back to have the shop check it out to see what it might be. I did have the R1 caminstalled and i don't know if they got any lube on it.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Brownie, interesting info. I'll double check my oil pressure this holiday weekend. Just curious, what is the stock oil pressure at 6000rpms?

382, what do you mean when you said you don't know if they got any lube on "it"? What is it and why would that affect oil pressure?

Ls1 382ci SS

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by akw408:

382, what do you mean when you said you don't know if they got any lube on "it"? What is it and why would that affect oil pressure?[/QB]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">reboot said he had a problem wityh low oil pressure after his cam swap. I had the cam in my all bore swapped out with the MTI one. I was just mentioning that it it might of been related but I doubt it since I have since changed my oil so that is out. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Scalpel

iTrader: (4)

I just did a cam/oil pump swap in my C5. I usually got an oil pressure at idle of around 23 PSI since it was new. With my ARE ported/polished oil pump I get 55 PSI at idle and it's pretty much pegged while driving around town.

Those that are experiencing low oil pressure with aftermarket/ported oil pumps probably don't have the O-Ring installed properly. This dramatically decreases your oil pressure. Another possibility is that your oil level is low. Maybe those that get a 5-7 PSI gain after an oil change are burning oil at a more appreciable rate thus lowering their oil volume and decreasing their oil pressure. Just some ideas to ponder.

Brownie

akw408,

I was getting around 65 psi at 5800-6000 rpms with my stock oil pump.

NastyC5,

That is a valid point. I checked my oil when I received the car back and it was above full (6 qt. oil change) and I always do 6 qt oil changes.

After talking with a few people it seems that the o-ring for the pickup tube is a likely candidate for me (and probably some of you). This leads to the aerating (sp?) of the oil and thus the pressure is down everywhere in the rpm band. I also had a rollmaster double row timing set installed and that could also lead to pickup tube/o-ring problems from what I have read in another thread.

I was expecting 45+ at idle and 70+ at wot and 6000+rpm. I too have an ARE ported oil pump.

Thanks for the replies.

Please keep the thoughts coming.

Mike

Scalpel

iTrader: (4)

When checking the pick-up tube and you notice that the O-Ring is not seated properly take the O-ring off and place it on the pick-up tube itself and then re-attach it. If you try to attach the pickup tube with the O-ring in the oil pump it can bind and not seat properly as you try to get the gears on the pump and the crank to line up. Therefore, having the O-ring on the pickup tube makes for a better seal, once you try it you'll see what I'm talking about.

Ls1 382ci SS

Wow, looks like I am not the only one. I just got my 382 all bore from ARE installed with the modded oil pump and my oil pressure is too low. I got the car yesterday and quickly changed the oil and filter. same thing. at idle the psi is at about 40 and when driving around it does go up depending on the rpm normally. what concerns me is that when driving and at a light the oil pressure goes to about 20-22psi and that is scary. I will take it back to have the shop check it out to see what it might be. I did have the R1 caminstalled and i don't know if they got any lube on it.

akw408

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by NastyC5:
<strong>When checking the pick-up tube and you notice that the O-Ring is not seated properly take the O-ring off and place it on the pick-up tube itself and then re-attach it. If you try to attach the pickup tube with the O-ring in the oil pump it can bind and not seat properly as you try to get the gears on the pump and the crank to line up. Therefore, having the O-ring on the pickup tube makes for a better seal, once you try it you'll see what I'm talking about.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That is interesting. I wonder which way the Helms manual instructs, since I'm sure the shop who did my pump probably went by the book.

Anyway, I went out for a spin today paying extra attention to the oil pressure. So cold, the oil pressure is in the 50s at idle. This is Mobil 1, 5W30, just changed 100 miles or so ago. After the oil is nice and warm (~220F), I see oil pressure at around 45psi just driving around. Not pegged, which I guess would be 80psi? I really don't understand how the oil pressure could be that high just driving around at low rpms.

Anyway, 45psi doesn't bother me. Still plenty. So then I hop on the freeway and start doing some WOT runs, it is really hard to pay attention to the road and the pressure gauge at the same time but it went from low 50s and low 60s. Highest I saw was 65psi. So I was thinking, WTF. Where was the 70psi or so? Did this quite a few times, started noticing that the oil pressure would spike up after I let off the gas. I guess that's what the pressure relief valve is for. Anyway, so I started to drive home and then I was driving real slow and I noticed my oil pressure was only 40psi, my engine was probably spinning at 1300rpms. So I increased it to 2000rpms, holding it constant, upper 40s psi. Went to 4000rpms, holding it constant, pressure went to upper 50s. Went to 5500rpms, pressure went to mid 60s. Ran out of road and came home. My car is also too loud to sit there at high rpms for that long this late at night. But I'm sure it would have went to 70s if I went to 6500rpms. Each time I increased the rpms, I could see the pressure climb, not instantaneous though. Maybe 1 or 2 seconds max though. Is that normal? I guess it all depends on where the pressure sensor is.

Anyway, I guess what I'm saying is the pressure you read from the gauge may have something to do with how you're testing it. At WOT, maybe the gauge doesn't have time to fully react, it may be dampened quite a bit. If you hold the throttle steady, then that's when I was getting consistent results. Is that how everyone else measures it?

Well, back to Brownie's car :

"Oil pressure maxes around 58 psi when wot and above 4000 rpm but will never exceed it.

Idles around 30 psi and drives around 42."

This sounds about what I saw as well, but I guess the question is how are you measuring the max oil pressure.

I have another question. When comparing 5W30 to 10W30, the 30 represents the viscosity at high temps right? So that they're both 30 means that they have the same viscosity at high temps? If so, then our results are very similar.

Also, I remember now posting a topic when I first got my oil pump and motor, it might be interesting to read :
https://ls1tech.com/ubb/cgi-bin/ulti...=003960#000000

Good luck, and if you do get the pump out and double check the installation, let us know.

<small>[ July 04, 2002, 04:13 AM: Message edited by: akw408 ]</small>

Brownie

Well even now when car is really warm (water temp is about 210, don't know about oil temp) the idle pressure is about 25ish.

I think when the oil temp is up after about 10 miles of driving I see 25ish at idle. Driving around drops to 37ish and 4000+ rpm is about 58ish still.

akw408, I tried your method of holding at those rpms but my pressure does not rise when holding the rrr's constant.

I am really hoping this is a pickup tube/o-ring problem. My pressure was fine before the install of the new oil pump and rollmaster double row timing set.

I have been reading some issues with installing the rollmaster double row with the engine in the car. Some have said its difficult to get the pickup tube and o-ring to be properly setup while the engine is in the car. Maybe I am proof <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />

The installer says that it was no big deal to install the rollmaster and they have a bunch of ls1 experience.

I hope to have the car back their by mid-week.

Mike