External Oil System

How do you know when you should be looking at an external oil system? I have a RB 493. I have been running a stock oil pump, 3/8" pickup, 7 qt pan, and never had a problem. I shift at 5800 and cross the stripe at about 6200.

Also, single or dual line pickup? What is the major difference?

Thanks in advance, Bob

Look at your oil pressure gauge next time you cross the stripe. If you're holding 60+ psi then you don't need the hassle of an external system.

The external system is probably only needed on Hemi engines which consume a bunch of oil. I don't think I've ever seen a big block system which really needed an external system but there are probably a few 8000 rpm B1 combos running around where it comes in handy.

i am putting a milodon single line in my 470 for peace of mind. make sure your oil galley passages are completely clear. from the research i did at one point chrysler had a sand cast issue in there narrowing and choking oil flow. andy finkbieners big block book goes into alot of that. theres good research info right here on moparts. as seaeed above, your oil gauge will let you know. do you already run a hi vloume pump. if so do you have a pressure adjustment on it. do your research. good luck

I've read Andy F's book. I researched here and on other sites as well. Then I found this...http://www.milodon.com/oil-system/chrysler.asp

From everything I have read:
-6500 RPM and down are fine with a stock pump(HV), but after that, a better system is required.
-Dual line is a must after 7500 RPM to accommodate enough volume.
-Converting from a 3/8" to a 1/2" isn't going to accomplish much as the tube of the pick up is the real restriction.
Am I on the right track here?

Quote:

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I've read Andy F's book. I researched here and on other sites as well. Then I found this...http://www.milodon.com/oil-system/chrysler.asp

From everything I have read:
-6500 RPM and down are fine with a stock pump(HV), but after that, a better system is required.
-Dual line is a must after 7500 RPM to accommodate enough volume.
-Converting from a 3/8" to a 1/2" isn't going to accomplish much as the tube of the pick up is the real restriction.
Am I on the right track here?

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I like and use the Federal Mogul narrow full groove main bearings in all of the motors I build for bracket and street duty My pump gas 518 C.I. low deck stroker got shifted at or above 7000 RPM in both 1st and 2nd gear and it would cross the finish line in the 1/4 mile between 6500 and 7200 RPM, depending on the track elevation and which rear tires where on the car at that race It had a stock Mopar 1970/71 street hemi/440 6 pak oil pan with the stock 440-6 pak 3/8 oil pick up I had that motor apart for parts swapping and hopping up a number of times, no problems with oiling the bearings, I did run the Mellings high volume oil pump and I did trim the bypass spring to lower the oil pressure to 65 lbs at or above 4500 RPM with hot oil. I did trim about a 1/4 of a coil off to much , it would have been safer to have 70 to 75 lbs hot but I didn't get it right and I chose to lived with the results. I do use 5W20Wt Valvoline straight petroleum based(non synthetic) oil in my motors with both types of lifters, roller or non rollers I do use the zinc additive on the flat lifter motors My current low deck 505 C.I. bracket motor has the Milidon dual line oil system and Milidon pump with a extended dual line swinging Milidon pickup,Charlies 10 quart oil pan with a kick out and windage scraper It crosses the finish line at 7700 RPM in high gear Same oil in both motors, this pump does have more pressure and volume than the other motor had I do run really loose oil clearances also, .003+ on both the rods and mains, usually the mains are .004+ on the clearances cold when checking them on the engine stand with a inside and outside mikecrometers A little loose on those clearances is far better than a tiny bit to tight