 Oil Line Help? |
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| jfrazar |
 Oct 21 2006, 08:22 PM
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#1
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Newbie  Group: Members Posts: 4 Joined: 29-April 05 From: Savannah, GA Member No.: 4,001  |
I used -10 oil lines on my 3.0 914-6 converison. No Press problems but everyone seems to be running. -12 and -16. Did I screw up?
Thanks, |
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| john rogers |
Oct 21 2006, 09:14 PM
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#2
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Senior Member Group: Members Posts: 1,525 Joined: 4-March 03 From: Chula Vista CA Member No.: 391 |
The problem with the dash 10 lines is the velocity of the oil is greater than the dash 12 and this causes a reduction of cooling in the cooler since the oil is moving along faster. The ID of dash 10 is 0.625 and dash 12 is 0.75 so the velocity will have to be higher in the smaller dia pipe since the oil is just about incompressible (for our purposes) and the oil pump is positive displacement. So the answer is........maybe, if the oil does not cool as much as you like then get bigger lines. I had to do that when I went from a dry summped stroker 4 to a 2L high revving 6 in the race car. Aaron now has the old lines safely tucked away in his black beauty.
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| jfrazar |
Oct 22 2006, 09:21 AM
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#3
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Newbie Group: Members Posts: 4 Joined: 29-April 05 From: Savannah, GA Member No.: 4,001 |
Thank you for the response.
So it is only an oil cooling issue? I was more afraid of a starvation issue. The car has good oil preasure even with the one bad rod. So I should be okay with -10 oil lines even if I add a front oil cooler with -10's as well. |
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| bd1308 |
Oct 22 2006, 09:24 AM
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#4
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
oil TEMP is the concern here...
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| Joe Bob |
Oct 22 2006, 10:17 AM
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#5
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
On a 3.0....-10 is about the smallest I would go. Depends on the engine, the cooler and driving conditions.
Not like it's a BAD thing....drive it and see.... |
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| brant |
Oct 22 2006, 10:28 AM
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#6
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914 Wizard Group: Members Posts: 11,622 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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For the feed line from the bottom of the tank.. a size AN-10 would be too small. most guys run that 2foot piece as AN-16
its a gravity feed and there can be starvation issues on that line (no pressure to push the oil back into the motor) brant |
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| eeyore |
Oct 22 2006, 01:19 PM
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#7
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Senior Member Group: Members Posts: 889 Joined: 8-January 04 From: meridian, id Member No.: 1,533 Region Association: None |
QUOTE(john rogers @ Oct 21 2006, 08:14 PM)  The problem with the dash 10 lines is the velocity of the oil is greater than the dash 12 and this causes a reduction of cooling in the cooler since the oil is moving along faster. I understand the velocity difference between -10 versus -12. The greater the cross section, the lower the velocity of the fluid. Since friction is a function of velocity, -12 move more fluid for the same amount of work than -10. However, isn't it be the cross section of the cooler itself that determines the velocity at which fluid flows through it, and not the feed lines? |
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