Posted by Dr. EVIL on November 16, 2015 at 00:39:55 from (70.194.132.106):
In Reply to: Re: Tractor oils. posted by animal on November 15, 2015 at 16:12:31:
Actually the removal of ZDDP from motor oil is OLD NEWS, 10+ years ago it was written up in HOT ROD magazine. RPM of the engine has absolutely NOTHING to do with cam wear due to no ZDDP. But valve spring pressure has EVERYTHING to do with it. High lift cams with cooresponding stiff springs have lot's of pressure between solid or hydraulic flat lifters and cam lobes. Rocker arm ratios even effect pressure.
Roller cams and roller rocker arms have no skidding wear surfaces so are immune from wear caused by NO ZDDP. My old 7.3L PSD engine in my '96 F-250 has roller cam followers & roller rockers from the factory so it's never needed much if any ZDDP. Engines with flat tappets like old tractor engines and small air cooled engines typically have soft valve springs and low ratio rocker arms for low wear pressure on cam lobes so lack of ZDDP doesn't really effect them much either.
The conventional 15W-40 ROTELLA T a in the white jug still has 1200 ppm of ZDDP according to Shell's answer man as of 2-3 years ago. Plenty of ZDDP to provide protection from wearing cam lobes flat in ANY engine. Even high lift cams in small block race engines running 10,000 RPM with dual & triple valve springs with 1000+# valve open spring pressure.
The failure mode has ALWAYS been a rather slow wearing away of cam lobes which causes the engine to misfire like it's out of tune. Engines suffering from no ZDDP have never blown up like thrown rods, spun bearings, etc. Some engines have been more sensitive to flat spotting cams than others, and certain vintage engines worse than others.
Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
