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EFV-8 Club Forum / General Ford Discussion / Oil pump

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Discussion Topic: Oil pump

4ford

06-19-2014 @ 9:29 AM

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Thanks guys.
Only low when idling maybe 5lbs. And I will try the oil supper suggested .

Thanks again!!!!

Drbrown

06-18-2014 @ 9:35 PM

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It seems each engine has its own personality depending on quality and nature of rebuild, coolant operating temperatures and choice of oil. I use regular 10W30 detergent (no additives) summer-winter in my 100hp '47 59AB that has 34,000 miles on its last rebuild. 70 lbs cold at 55 mph; 25 lbs cold at idle; 60 lbs at 185 degrees at 55 mph; 15 lbs at 185 degrees at idle. No noticable oil lose/consumption.

joe b

06-18-2014 @ 6:13 PM

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Definitely follow Super's suggestion if you haven't already and run 20/50 oil. I had the engine rebuilt in my '41 in California and followed the Ford instructions and used 30 wt. Hot days,Low oil pressure. Went to 20/50 and all was well. The STP is probably helping the viscosity.

cliftford

06-18-2014 @ 5:04 PM

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I agree with the last 3 posts, but if you're like me you get nervous when you see the oil pressure needle near zero at 60mph. I put in a can of stp with each oil change and it will hold around 20 to 25# at highway speeds on a warm day. Gene.

flathead4rd

06-18-2014 @ 3:27 PM

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It's not really about oil pressure with a flathead, it's about volume. As low as 5 to 10 PSI when hot will still move plenty of oil through the system.

carcrazy

06-18-2014 @ 9:44 AM

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How low is your hot oil pressure? I wouldn't worry about it unless it is really low. You do not want to have very high oil pressure. I had a '40 flathead rebuilt with the later high volume (and pressure) oil pump. The oil pressure gauge was pegged to its maximum reading all the time hot or cold and after 500 miles the totally rebuilt engine had a leak from the rear main bearing at the rate of 200 miles per quart of oil!

supereal

06-18-2014 @ 7:28 AM

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Most flatheads seem to lose all oil pressure when hot. These engines have wide clearances compared to modern vehicles. If you see the oil pressure gauge near the top when first started, then drop to the other end when idling hot, this is normal. Many of us run 20W-50 oil during the summer driving.

4ford

06-18-2014 @ 6:42 AM

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Is there any way to get the oil pressure to rise. I have a 1941 59ab. It has good pressure at first then it drops when it warms up. I know that there was not a lot of oil pressure on these motors to start with.. Would a high pressure pump help??? The motor seams to be in good shape. Pulled the oil pan cleaned it out and the screen looks good. The cam from what I could see from the bottom looks ok. Compression is about 95. On average

Thanks. Mike

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