|
45 year old engine I would go with either brad penn 20w50 free shipping from jegs or straight brad penn 40wt if your ambient temp when u start the car is above 60f. Reason for the BP is high zinc and phosphorous. Once again any oil is fine!!!!!! Nothing beats a straight weight outside a synthetic.
QUOTE=saturnkk;1277011]So is 20-50 okay for a 45 year old Chevy 327 then? I had heard that as an engine ages, with niles, it is better to go with a "thicker oil" to make up for the wear...[/quote] |
Quote:
|
Quote:
|
I really appreciate the kind of topics you post here.
|
Multi weight dino oil is made with the lower viscosity to begin with, for example 20W50 is 20weight with viscosity improvers to get 50 weight when at 100C. Synthetic 20W50 starts at 50W and uses VI's to get to 20W at 40C. Assuming both oil are run indefinetly eventually the dino 20W50 will be 20W once the VI are consumed and 20W50 synthetic will be 50W. I would rather have the 50Wt as opposed to the 20W once the VI are consumed.
VI do not have the lubricating properties of oil and is why you want the smallest spread in a multi viscosity oil. Straight oil has no VI it's entire volume is oil. Synthetics do a superior job as compared to Multi weight dino's. Most modern day oil are made for modern day cars looking at fuel efficiency and emmisions. They have extensive detergent packages etc. Brad Penn and I assume Joe Gibs don't care about emissions and fuel efficiency. There oil have 50% more zinc and phosphorous which is known to harm catalytic converters. Kinda like an extreme pressure additive. That being said you could get a shelf brand oil and throw in some red line break in additive and get the same result. |
This is always a hot topic in any forum.So many are certain they are running the correct viscosity oils because they might have been told it would or they truly believe if it works in this engine it has to work in mine.
No doubt they will get away with their choices but for their engines best protection especially at startup and in their unique climate (Northern cooler Southern warmer). The other things to consider are camshaft choices flat tappet or roller, tight tolerances or loose. Finally the engines efficiency, tight tolerance lighter viscosity loose tolerance higher viscosity |
You nailed it!!
"The other things to consider are camshaft choices flat tappet or roller, tight tolerances or loose. Finally the engines efficiency, tight tolerance lighter viscosity loose tolerance higher viscosity" Problem is 99% of the guys on this forum have no clue what tolerances their engines were built with and 50% probably don't know if they have flat tappet or roller. Quote:
|
Quote:
|
Unless you have documentation to back up the ZDDP in the oil.....then all of this talk is meaningless.
50% more of what???..... Most oil company's don't publish there numbers of ZDDP.....If they do....at least you have something to compare to. And viscosity is not what the numbers stand for.......it's the molecule ie; 5W30 is 5 weight molecule = Winter = 30 weight molecule. We run 0W50 in our Kinetic FE motor and that is why most of the NASCAR guy's run the same.....quick oiling on start-up and 50 wt molecule when hot.......and it maintains the structure of the oil for a long time......and has been tested many times. So get the numbers so you can do your own comparison for you own application..... |
|
2 Attachment(s)
Excellent ....that's what I'm talking about.....
Then you can make you own analysis and use what is appopriate for your application ..... |
Brad penn publishes on their website ding dong with lab analysis
Quote:
|
Weight of the molecule. That's the first time I've ever heard that one.
|
Quote:
|
The grade of oil is not determined by Mobile. It's determined by SAE. SAE doesn't say anything about the size of the molecule, it's all about viscosity measurements.
"By 1926, there were six single grade designations in SAE J300. Such oils, identified as SAE 10, 20, 30, 40, 50 and 60, were graded according to viscosity measurements at 130 degrees and 210 degrees Fahrenheit. " How Do You Choose the Right Type of Oil for Your Car? |
Bob
You only quoted a small portion of what I was talking about..... "Molecule . a quantity of a substance, the weight of which, measured in any chosen unit, is numerically equal to the molecular weight; gram molecule. any very small particle." The size of the molecule will determine the viscosity..... And like I said...5W30 stands for 5 weight winter oil at 32*degrees and 30 weight molecule at 212*degrees ..... So in the racing world....when Mobil came out with their 0W50 racing oil with 1800 ppm of ZDDP......many of us changed over to it from SCCA, NASCAR, to INDY Car, because it flowed on initial start up and the 50 weight molecule worked great at the high temperatures....on our cams and crankshaft. BTW....if you have ever seen 50 weight oil at temperature flowing......it looks like Black Water...... |
An oil molecule is the same size and weight, always. It never changes. No matter what the brand or viscosity, the oil molecule is the same size and weight. That's a constant. Just like any other molecule. To change the size/weight, you need to add or subtract atoms. When you do that, you create a new substance. That's basic chemistry.
Nowhere in that article does it mention molecular weight. SAE grade's the oil rating on it's viscosity at a specific temperature. That's it. that's all it's based on - viscosity. The ratings change a bit through the years as oils and engines advance. But it's still based on viscosity. The manufacturer's change the viscosity with additives, as said above. That doesn't change the basic molecule, but does change the solution. Like making kool-aid. |
SAE defines the measurement of the viscosity.
Viscosity is defined or determined by the molecular weight. Mineral oil molecules are not all the same. The molecules vary in structure, size, and weight. It is the average weight that determines viscosity. Synthetic oil molecules are all identical. |
Quote:
|
408w supercharged all I have ever run is 10W-40 in any my motors. Even in my 460 drag motors. Change 4000 to 5000 no problems. The big block I turn 7000 going through the traps. I have yet to break it. I no that's boring. 90% of the stuff on the TV is hype.
|
| All times are GMT -7. The time now is 10:35 PM. |
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: