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Zinc was once a significant additive in motor oil. Modern motor oils have removed zinc, and this creates a problem for older engines with flat tappet (lifter) camshafts. A roller camshaft and lifters can get by with today's synthetic and conventional oils, as the roller and lobe contact surface is broader with far less friction. The base of a flat tappet lifter is actually convex. This reduces the contact point for flat tappets and creates the highest operating pressure per square inch in an older engine design. Non-zinc oil cannot buffer against this friction and wear. Break-in of a new camshaft and flat tappets is especially critical. If your AMC/Jeep or any other engine has flat tappets, a zinc additive during break-in is essential. During a camshaft change or fresh engine assembly, use a quality engine assembly lube on critical parts. Add a quality zinc (ZDDP or zinc dialkyldithiophosphate) additive like Rislone® Hy-per Lube® to the crankcase oil for at least the break-in period. Below is a new press release from Rislone®. As a light and medium duty truck mechanic, I used the original Rislone® oil additive over fifty years ago . This century old company has always produced quality products. Consider Rislone® Hy-per Lube® ZDDP additive for your break-in oil supplement and be sure to protect the new camshaft and lifters. Modern oil will not get the job done...Follow the Rislone® packaging directions or visit the Rislone® website to determine how much Hy-per Lube® to use when breaking-in a new camshaft and lifters or for new and freshly rebuilt engine break-in.—Moses Ludel New Rislone® Hy-per Lube Zinc® ZDDP Supplement enhances regular motor oil and turns it into a high-performance lubricant that protects against friction and wear in a wide range of vehicles, including antique and classic cars, hot rods, motorcycles, trucks, daily drivers and race cars, with gasoline or diesel powertrains. New Rislone® Hy-per Lube® Zinc ZDDP Supplement Protects Both Classic Cars and Modern Vehicles Product combines best of Rislone and Hy-per Lube ZDDP supplements in easy-to-use package Holly, MI (April 21, 2021) – Rislone®, America’s best-selling engine treatment brand for 100 years, has upgraded its Engine Oil Supplement with Zinc Treatment by incorporating the best of Hy-per Lube® Zinc Replacement Additive to create an even stronger engine-protecting formula. New Rislone Hy-per Lube Zinc ZDDP Supplement protects against friction and wear in a wide range of vehicles, including antique and classic cars, hot rods, motorcycles, trucks, daily drivers and race cars, with gasoline or diesel powertrains. Rislone Hy-per Lube Zinc ZDDP Supplement is a petroleum oil performance “booster” that combines ZDDP (zinc dialkyldithiophosphate), phosphorous extreme pressure agents and mixed esters to enhance regular motor oil and turn it into a high-performance lubricant that protects internal engine components including pistons, flat tappet camshafts, lifters, pushrod tips and the rest of the valvetrain in older engines and racing applications. Modern oil no longer includes the level of ZDDP these engines need. While it is designed for engines requiring SL/CI rated oil and older (generally pre-2005), Rislone Hy-per Lube Zinc ZDDP can also be used in newer vehicles to stabilize any motor oil against viscosity and thermal breakdown. This results in improved protection against friction, especially at start-up, for less wear and a cooler-running, longer-lasting engine. The added protection can be especially important in modern high-performance street vehicles that often have more power than race cars had as recently as 20 years ago. “Nothing has been developed in all these years that works better than zinc and phosphorous ZDDP for metal-to-metal protection inside the engine, especially for older vehicles,” explains Clay Parks, vice president of development for Rislone. “Our new formula uses a proven real ZDDP additive package that’s specially blended with a precise mix of detergents, tackifiers and esters to work together to keep the protective oil from draining off parts when the engine is off. This means the lubricant is effective as soon as the engine starts, rather than being delayed until the oil pressure comes up and starts to move inside the engine, helping to eliminate dry starts.” The new product retains the original Rislone part number 4405, UPC and 11 oz. bottle for streamlined ordering and stocking. The package is now silver with bold blue graphics and a bright red spout that not only helps it stand out on the shelf, but also makes it easier to install the product. Rislone Hy-per Lube Zinc ZDDP Supplement works with all petroleum-based motor oils, including conventional, high-mileage and synthetic formulas to make new oils backwards compatible for older and high-performance engines. For best protection, it should be added at every oil change. It can also be used to top off oil as needed. For cars and light trucks, add one bottle to gasoline engines from 1996 and older, half a bottle for those made between 1997 and 2004, and about ¼ of a bottle to newer engines. Diesel engines made in 2006 or earlier get one bottle for every 5.5 quarts of oil capacity. Newer light-, medium- and heavy-duty engines get half a bottle. For four-stroke marine, motorcycle, ATV, agricultural, industrial and racing engines, add 2 ounces for every quart of capacity. Rislone Hy-per Lube Zinc ZDDP Supplement is available to distribution in case packs of six 11 oz. bottles. Like all Rislone products, it is made in the U.S.A. For more information about Rislone Hy-per Lube Zinc ZDDP Supplement or any other product in the full Rislone line-up, visit rislone.com. Based in Holly, Michigan, Rislone has been America’s best-selling engine treatment brand for 100 years. Rislone is ISO 9001 certified. Follow Rislone on social media at facebook.com/Rislone, twitter.com/Rislone, youtube.com/risloneglobal and through the blog at rislone.com/blog.
I can't seem to find any anecdotes one way or another for this engine. I've driven full-size trucks that had an RV cam grind, and they ran great. I'm looking to rebuild a 1.6 8v and wondering about a Stage 1 or Stage 2 cam grind. If anyone has done this, I'd really be interested in hearing about your results. ...also considering refurbishing the head...maybe a 3 angle valve grind.
Hi, I have a '89 Wrangler with the 2.5l. It pops/backfires back up through the intake whenever I give it throttle. There are no vacuum leaks. I have replaced every sensor. I have swapped out the PCM, no change. I have checked fuel pressure, 15 psi. At this point I found excessive play in the distributor when rotating the crank, so I pulled the timing cover and found the chain to be stretched, and the cam sprocket and crank sprocket timing marks were mis-aligned. Aha! I said, and replaced the timing set- I set the crank to #1 TDC on compression, rotated the cam forward so that the marks would line up properly, and installed the new set. After reassembly, I checked the distributor and made sure that it was pointing to 6 o'clock when the timing mark on the cover was at 0 BTDC. I then fired it up, and the issue remains. Backfiring through the intake. Could this be a camshaft or valve issue? What would be the next move?