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Cummins flycut pistons3/25/2023 Use a break in oil that has a high zinc content. So it is very important to start with new oil. Used oil carries contaminants, and the additives that help lubrication under extreme pressure have been broken down, and are much less than new oil. It first starts with the break in process. Ask your dealer, or give us a call and we can help get you to a good machine shop to perform the work. If your block has been removed from the truck, or can be removed, it is a low cost insurance to have this done. We even recommend having your block align bored and cam bushings installed on any engine for any use. Even if you do not meet these specifications, and you are using it in any type of pulling or racing, it is highly recommended to have your block modified to accept cam journal bearings for all 7 journals. 340″ lobe lift, more than 375# nose pressure or getting close to 4500 rpm, it is highly recommended to have your block modified to accept cam journal bearings for all 7 journals. Having the block line bored and installing journal bushings will ensure this does not happen with a cast or a steel camshaft. If you are running a cam with more than 210 degrees of duration more than. In instances where big lift cams and high spring pressure are used, the cam can push through the oil film that separates the cam and block and seize. The other five or six journals ride directly on the block. ![]() The Cummins engines, have either one or two bearings for the seven journals. On engines seeing over 30 psi, over 500 hp, or over 3500 rpm we also suggest to please call, and we will help you determine the spring you will need.Ī steel camshaft will stop most breakage due to harmonics, and twist, but it is still vulnerable to breakage from journal seizure. Talk to your dealer or give us a call and we will recommend the correct lifter for your application. This lifter has been tested on super stock open trucks, 3.0 trucks, and the same technology has been used in NASCAR for many years. For engine applications using extreme boost, high rpm, spring pressures over 103 seat, 375 open, and high mileage use (such as modified trucks that are driven daily) we also offer an up graded tool steel lifter that is DLC coated. ![]() For reground lifters we check hardness on all lifters before resurfacing to guarantee correct operation. Our tappets are also checked for hardness consistency, and must meet a minimum RC. Thus slowing down wear and evenly spreading the wear across more of the tappet. Our No Limit MFG new tappets, and reground tappets are made with a crown on the face. This inconstancy can lead to tappet and camshaft failure. We also have found hardness inconsistency in OEM Cummins flat tappets. This causes edge loading, and will quicken wear. The OEM tappets are built with a flat face. OEM Cummin’s tappets will not work with No Limit MFG steel camshafts. You must have new tappets supplied by No Limit MFG or have your tappets resurfaced from No Limit MFG,when installing any of our cams, or damage and wear may occur. This cam requires the use of a 1.300 diameter tappet or larger. Tappets – What you need to know before installing your camshaft. A basic degree wheel, a small amount of wire and a dial indicator is all that is needed to degree a cam in. To modify installed centerlines call us for offset keyes, or adjustable cam gear. Keep in mind that some Cummins cam gears have slightly different offsets built in. A basic degree wheel, a small amount of wire and a dial indicator is all that is needed to degree a camshaft in. To modify installed center lines call us for offset keys, or an adjustable cam gear. Requires fly cut to the pistons it is up to the customer to insure installed centerlines, and piston to valve clearance. Our camshafts work best when the intake lobe center line is installed from 98° to 103°. Great for a hot street, Drag racing, 2.5 pull truck to a full time competition vehicle, or multi turbo charger systems. Increased durations and lift to utilize increased air flow from ported and aftermartket heads. Results will vary depending on the grind you choose. Here are some of the benefits you will see with our cams. Every cam is drilled and tapped for a bolt on retainer.Induction Hardened Steel Core Construction for strength that resist cracking under severe stress.
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