Larger dry sump tank question
02-22-2010, 06:19 AM
#1
Drifting
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Larger dry sump tank question
Added a Lingenfelter dry sump tank and still see oil pressure drop to 15 psi. What next? MY C6Zo6 has 30560 hard miles.
02-22-2010, 08:58 AM
#4
Le Mans Master
When the oil is very hot after a track session, also at idle, I have noticed it will drop very low (almost scary low), but it is ok (at least I think so). Mine has been doing this for a while and has less than 1/2 the miles your car does with no problems. When I let it cool down and restart it goes back to where it should be.
I think the fix may be a higher weight oil for track days.
I think the fix may be a higher weight oil for track days.
02-22-2010, 09:11 AM
#5
Race Director
I agree that idle will drop very low, but should go up to at least 25 or so if you rev the engine. If you are below 15psi at higher rpm, then I'd look into a pump etc
02-22-2010, 11:40 AM
#7
Le Mans Master
I know mine has done something similar, but when I rev the motor it always goes up into a normal range. But again, wouldn't a heavier oil be something to try first?
02-22-2010, 11:49 AM
#8
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I'm no expert but I think its more an oil volume issue than one related to the viscosity of the oil you use. I've got the fully built LPE 403 motor (with the high volume oil pump assembly) and when I get off the track I've seen pressure as low as 18 at an idle. The pressure rises with RPM's and the pressure is back to normal by the next session. I'd like to see the post session idle pressure higher but its done this for years without any problem I'm aware of.
02-22-2010, 12:17 PM
#9
Drifting
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You are Right boys i need a race car. BUUUUT this economy is doing a whoooooop aaaaazzzzz on me.
sgvette, stop the sushi scene and heeeeeeeeeeelp out.
sgvette, stop the sushi scene and heeeeeeeeeeelp out.
Last edited by shifter77; 02-22-2010 at 12:21 PM.
02-27-2010, 06:52 PM
#12
Racer
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Oil Tank Shield
Easy there with the big font and all caps Speedy G,
Here's the photos showing the metal heat shield all around the BIG oil tank with hi-temp insulation mounted on both the inside and outside. If you choose, like many do but not me, to mount it inside the engine compartment, where the battery was, then it's directly exposed to the excessive header tube heat, and FOD and still you only have a flimsy fiberglass firewall separating you from the oil tank so mine's better!
Here's the photos showing the metal heat shield all around the BIG oil tank with hi-temp insulation mounted on both the inside and outside. If you choose, like many do but not me, to mount it inside the engine compartment, where the battery was, then it's directly exposed to the excessive header tube heat, and FOD and still you only have a flimsy fiberglass firewall separating you from the oil tank so mine's better!
02-28-2010, 08:41 AM
#13
Buzz,
I don't think you would pass tech inspection in SCCA. I'm pretty sure you are not allowed to have any fluids in the same compartment with the driver. That little cap on the tank is all that would prevent hot oil getting to the driver in some sort of impact.
Maybe some local clubs who don't care about your safety might let you run, but no way would Grand Am, ALMS or SCCA let you have the tank in the driver compartment.
Not trying to be sarcastic, just the facts.
I don't think you would pass tech inspection in SCCA. I'm pretty sure you are not allowed to have any fluids in the same compartment with the driver. That little cap on the tank is all that would prevent hot oil getting to the driver in some sort of impact.
Maybe some local clubs who don't care about your safety might let you run, but no way would Grand Am, ALMS or SCCA let you have the tank in the driver compartment.
Not trying to be sarcastic, just the facts.
02-28-2010, 12:53 PM
#15
Safety Car
So, it doesn't disallow this configuration, but depending on who the tech inspector is they may want a better "seal" on the bulkhead.
I only wanted to look it up because the bulkhead and line wording reminded me of the fuel cell and lines which says pretty much the same thing. If it runs through the driver compartment it's metal or metal braided lines, and there's a bulkhead between the cell and the driver.
The bulkhead between my cell and the hatch area (RX7) is a simple sheet of aluminum on hinges so I can open it to fill...
02-28-2010, 01:07 PM
#16
Melting Slicks
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Perhaps you gentlemen are already aware of this, but there are different capacity - pressure GM and aftermarket oil pumps:
Using the standard GM LS oil pump as a base, the following pumps have the following hot (260 F) pressure and flow differences:
1) GM Stock pump: ~ 15 to 20 psi at idle and ~ 40 to 45 psi at speed.
2) Melling - 10296 - pump: ~ 25 to 30 psi at idle and ~ 50 to 55 psi at speed. 18% more volume than the Stock pump.
3) GM low-pressure, Displacement-on-Demand - 12612289 -pump: ~40 psi at idle and 70 psi at speed. 31% more volume than the Stock pump.
Using the standard GM LS oil pump as a base, the following pumps have the following hot (260 F) pressure and flow differences:
1) GM Stock pump: ~ 15 to 20 psi at idle and ~ 40 to 45 psi at speed.
2) Melling - 10296 - pump: ~ 25 to 30 psi at idle and ~ 50 to 55 psi at speed. 18% more volume than the Stock pump.
3) GM low-pressure, Displacement-on-Demand - 12612289 -pump: ~40 psi at idle and 70 psi at speed. 31% more volume than the Stock pump.
02-28-2010, 01:39 PM
#17
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Perhaps you gentlemen are already aware of this, but there are different capacity - pressure GM and aftermarket oil pumps:
Using the standard GM LS oil pump as a base, the following pumps have the following hot (260 F) pressure and flow differences:
1) GM Stock pump: ~ 15 to 20 psi at idle and ~ 40 to 45 psi at speed.
2) Melling - 10296 - pump: ~ 25 to 30 psi at idle and ~ 50 to 55 psi at speed. 18% more volume than the Stock pump.
3) GM low-pressure, Displacement-on-Demand - 12612289 -pump: ~40 psi at idle and 70 psi at speed. 31% more volume than the Stock pump.
Using the standard GM LS oil pump as a base, the following pumps have the following hot (260 F) pressure and flow differences:
1) GM Stock pump: ~ 15 to 20 psi at idle and ~ 40 to 45 psi at speed.
2) Melling - 10296 - pump: ~ 25 to 30 psi at idle and ~ 50 to 55 psi at speed. 18% more volume than the Stock pump.
3) GM low-pressure, Displacement-on-Demand - 12612289 -pump: ~40 psi at idle and 70 psi at speed. 31% more volume than the Stock pump.
02-28-2010, 05:10 PM
#19
Race Director
I've see a lot of pro race cars with sumps in the drivers' compartment. Not ideal, but it has been done. I worry about the heat as much as any actual safety issues, but a proper bulkhead isn't that big of a deal.
And the GCR quote above pretty much states that even putting it in the engine bay is illegal unless you install a metal bulkhead, which Vettes don't have from GM.
Are those pumps above drop-in replacements??? I've always just shimmed the bypass spring to increase pressure.
And the GCR quote above pretty much states that even putting it in the engine bay is illegal unless you install a metal bulkhead, which Vettes don't have from GM.
Are those pumps above drop-in replacements??? I've always just shimmed the bypass spring to increase pressure.
