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Joined: Nov 2016
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Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2016
Posts: 36 |
Hi, new member here. Just bought a 41 coupe. I noticed the oil pressure gauge only goes up 30 lbs.I once had a 47 Plymouth, and the oil pressure gauge went up to 45 lbs. Why the difference? Is it because the chevvy has an overhead valve set-up? Curious, Ed
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
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The Plymouth had full pressure oiling to the main bearings and to the rod bearings. The crankshaft was drilled to get the oil to the rod bearings thus more pressure was necessary.
The Chevrolet engine has full pressure to the main bearings only and the rods are lubricated by dippers on the rods that dip into a trough under each rod. The troughs are filled with oil under low pressure, like only a couple of pounds.
Your normal oil pressure with hot 10W-30 oil will be around 15 pounds at highway speeds and 5 pounds at idle. It may go up to 30 ponds briefly when cold.
Gene Schneider
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Joined: Jan 2006
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Hall Monitor ChatMaster - 7,000
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Hall Monitor ChatMaster - 7,000
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A 216 will run about 15 PSI hot at speed and <5 at idle.
VCCA Member 43216
Save a life, adopt a senior shelter pet.
1938 HB Business Coupe
1953 210 Sedan
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Joined: Nov 2016
Posts: 36
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2016
Posts: 36 |
Thanks, guys, for that info. So, do you think the Chevvy set-up is better than the Plymouth? Ed
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Joined: Oct 2009
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ChatMaster - 1,000
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Time proven. If you dont hammer them, they will run forever.
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Joined: Sep 2002
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ChatMaster - 2,000
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ChatMaster - 2,000
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We must answer your last question with a big YES. Old Chevies are the best!
My 1951 1 Ton is now on the road! My 38 Master 4 Door is also now on the road .
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Joined: Sep 2012
Posts: 41
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Sep 2012
Posts: 41 |
Just for my info.
I have a 49-3100 with a 55-235 engine.
What should be my oil pressure at idle and at 50 mph with a hot engine and 10-30 oil.
Thanks
Doug
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
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With hot oil at least 35 pounds at 50 MPH nad 10 pounds at idle.
10W-30 is what I would recommend.
Gene Schneider
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Joined: Sep 2009
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ChatMaster - 6,000
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The oil pressure reading on any particular engine may vary slightly depending on the thermostat opening degree when the engine is at stable temperture. (I didn't put that just right but I think you and anyone else will know what I mean. Charlie 
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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True, and from my experiance it can take at least 1/2 hour of highway driving to completely heat up the oil to full temp.
Gene Schneider
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Joined: Jan 2002
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ChatMaster - 1,000
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ChatMaster - 1,000
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1946 Chevy 3100 1/2 Ton Pickup Purchased 11/18/17 Sold 9/20
1948 Chevy Fleetmaster Coupe, Purchased 6/20/2010
1965 Chevy ll 350 Purchased Feb 2021. 3-speed Saginaw Hurst Floor Shifter 3.08 Rear End
2019 Ford Ranger Lariat Super Crew
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