Among those details, the type of piston rings used in racing and high performance engines is always a hot topic. Wiseco Piston 2.770" X .640. This product is made of high-quality materials to serve you for years to come. Conversely, a 5.400" diameter piston … They impact combustion sealing, oil control, friction, and many more engine attributes. Celebrating 70 years in 2011, Wiseco continues to "service the needs of motorsports enthusiasts" by manufacturing the best high-performance pistons. Moderate nitrous applications in the 250 HP range will work with the ring pack approximately .250-inch down from the crown. Powersports™ Replacement High Performance Piston Ring Set by Wiseco®. This offers a superior strength, weight reduction, improved heat transfer and longer life. Axial clearance is typically checked by inserting a feeler gauge between the ring and the top of the ring groove. The thimble sized piston from a Cox .049 model airplane engine operates just fine with such minimal clearance that it does not even require any form of piston ring to seal the combustion gas. OEM Replacement This part is aftermarket equipment designed to replace the original manufacturer's part numbers specified here. Piston rings are made by OEM factories to exact specifications. The accumulator groove is machined into the piston between the top compression ring and the second (scraper) ring. These grooves are machined into the top ring land above the top ring to minimize contact drag when the piston rocks over upon reversal. To check the gap, the ring should be placed into the bore (without the piston) and squared up so that its level, using a ring-squaring tool. On many performance applications, Wiseco includes file-fit rings, which are designed with very small end gaps that must be filed to fit in the bore for proper end gap for the application. Each ring should be fitted to the particular cylinder in which they are to be installed. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced … series pistons are forged from 4032 alloy aluminum in Mentor, Ohio and include rings, pin, and clips for an all-inclusive rebuild. SERVING THE RACING INDUSTRY FOR 75 YEARS! By continuing to use this website you are giving consent to cookies being used. Wiseco is a USA manufacturer for performance products such as forged pistons, clutch baskets, gasket kits, connecting rods, valves, crankshafts, and camshafts for motorcycles, dirtbikes, ATV, … Pay Attention to the Skirt “On asymmetric piston … Once the ring is in the bore, use a feeler gauge to check the gap. Follow the ring gap instructions for the pistons you are using. The piston … 800-969-7501. The quality and placement of the ring grooves on your pistons is just as important as your cam specs. Smaller ring thickness means less mass and less inertia to overcome when the ring reverses direction at TDC and BDC. Decades ago racers like Bill “Grumpy” Jenkins used to purchase unfinished pistons and cut their own ring grooves exactly where they wanted them and to the finish and tolerance they desired. For more information visit our, View ALL Press Releases On Our New Products Page, 2018 KTM300EXC TPi and 2018 Husqvarna TE300i Piston Wiseco Product Search By Application --Select Year-- 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 … For example: 4.125” bore divided by 22 is .187” radial wall thickness. Use with 1 Piston. Kit, Copyright © 2020 Wiseco Piston Company Inc. All Rights Reserved - Use of this site is subject to the following list of. Accumulator grooves have proved most effective and they are a common feature on many, if not most, high performance and racing pistons. featured, NOS Wiseco Piston Kit 1.00 Bombardier 1984-1986 Cam Am 250 524P4 524-P4. Topics: $19.99. Wiseco Domestic Automotive Forged Pistons This line features dedicated forgings, specially designed valve pockets, unique dome and crown designs, optimized skirt profiles and precision machined ring grooves. Above that, more is always better as nitrous air fuel ratios are always chaotic and unpredictable. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Polaris Trail Boss 350L 4x4 with 2 Stroke Engine 1993, Ring Set by Wiseco®. Its purpose is to provide additional relief space for pressure escaping past the top ring to build up before it attempts to pass the second ring. Piston ring grooves serve a larger purpose than simply supporting the rings. We Ship Today! Proper ring groove placement and ultimate sealing quality are the keys to more power and durability under any severe duty applications. The pistons … As the leader in LS-1 forged pistons, Wiseco pulled out all the stops when designing the LS Series. They add minimal volume to the crevice volume and they also help resist detonation by disrupting flame travel into the crevice volume where pressure spikes might unseat the ring. ... TiN Coated Ring by Wiseco®. Thinner rings and smaller ring grooves offer more leeway for optimum ring placement because they require less space, but they are at risk in sever applications. $199.99. Lowest Prices. This thick dome piston can be machined to a .540" compression height if needed. Designed using state-of-the-art technology and with … Powersports™ High Performance Piston Ring Set (8650XX) by Wiseco®. Wiseco’s piston ring compressor sleeves are an indispensable addition to any engine builder’s toolbox, and make it easy to do the job right the first time. Wiseco Performance Engine Parts from an Authorized Dealer. Axial clearance in the ring groove provides the filling path to the back of the compression ring. These rings have a stainless steel gas nitride top ring, cast iron Napier hook second ring, and flex-vent oil ring with gas nitride scraper rails. The first method is preferred and it is good practice to check it at several places around the perimeter of the piston. It also lets them use shorter and lighter pistons. The interface between the ring face and the cylinder wall is still widely discussed among racers and engine builders, but combustion sealing in the ring groove is equally important. The smaller ring also generates less friction but there is a relationship between ring dimensions, sealing and oil control. Designed using … Depending on the application, the side clearance is typically .001-.003-inch. 1300+ products In Stock, ready to ship at CARiD.com. We'll ship today if ordered in: 1 0 HR: 0 1 … Don’t measure between the ring and the bottom of the ring groove as you might damage the sealing surface. But that’s just part of the Wiseco … Microwelding upsets ring sealing quality and can even jam the ring in the groove. Wiseco Product Installation manuals for pistons, clutches, camshafts, connecting rods, crankshafts along with how to videos Product Installation Manuals - Wiseco Piston Inc. Although made with pride in Ohio, Wiseco pistons … Radial Wall ThicknessRing dimension from the front face touching the cylinder wall to the back or inside face of the ring. The Best 2-Stroke Engine Rebuild Video You'll Ever Watch, Mixin' Gas, Makin' Memories: 2020 Wiseco 2-Stroke MX World Championships, Polaris RZR: Rebuilding the Legends with Wiseco, 2020 Wiseco 2-Stroke MX World Championships Are Back On, Loretta Lynn's Amateur Motocross Championships Daily History | Wiseco 2020. Radial Back Clearance   Ring groove space behind ring when the ring face is flush with piston ring land. Almost gone. Pistons and rings are available for purchase at: www.midwestsupercub,net or by calling (563)659-5276 Look for Midwest Super Cub at your next pulling event and make sure to pick up a new … Start with the minimum of .001-inch and work up. Intake valve pocket specs generally control top ring position because the intake valve is always larger with more proximity to the edge of the piston crown. For any build budget, Wiseco has the piston to get you on the road or down the track. Today, that’s no longer necessary as manufacturers such as Wiseco pay considerable attention to ring groove design. While various types of piston rings are more suitable to specific applications, the ring grooves themselves are often overlooked in the pursuit of optimum cylinder sealing. The cylinder bore must be honed to the final size before ring gap can be checked. For more information visit our Privacy Policy. In that case, .450-inch or more is not unreasonable. This site uses cookies. Shop Wiseco Pistons & Piston Rings at Dennis Kirk. Axial HeightThe dimension from one side face to the other or ring thickness, usually expressed in fractional sizes like 1/16”, decimal sizes like .043” or metric sizes like 1.5mm. The main purpose for axial clearance is to allow the ring to spin. Sometimes the ring pack is moved down well over .400-inch to accommodate these concerns. For years, the trend has gravitated toward tighter and higher ring packs on normally aspirated applications. You can determine the back clearance by measuring the depth of the ring groove with the depth scale on a set of dial calipers and then comparing it to the measured radial thickness. 2. Wiseco 808M06640 Single Ring Racing Piston Kit Standard Bore 66.40mm 5 out of 5 stars (2) 2 product ratings - Wiseco 808M06640 Single Ring Racing Piston Kit Standard Bore 66.40mm Another way is to use modeling clay or soft wax; press it into the groove then remove it and measure with a caliper. High temperature and excessive movement are the root causes. It promotes stability by spreading the contact points between the rings and the skirt and reduces the crevice volume which resists detonation and promotes a more consistent burn, making the cylinder more active. The gas pressure must be evenly applied to the ring to promote a good seal and to prevent detrimental ring flutter. Before the Internet, even before mail order titans like … We often get calls about people setting ring gaps to OEM specs which can be as little as 1/3 the amount of ring gap that’s actually required.” Mistake #3 - Putting rings … Automotive Products … Everything You Need to Know About Ring Gap! It then fills the ring back spacing to press the ring out against the cylinder wall. Click Here for more information on Wiseco Pistons and rings. By continuing to use this website you are giving consent to cookies being used. ENGINE TECH, These AMC pistons come with anti-friction skirt coatings, plasma moly piston rings, heavy duty wrist pins and pin retention clips. So The ring is pressurized against the cylinder wall and the bottom of the ring groove. The gap on the second ring should always be larger than the top ring end gap, this will help to reduce top ring flutter or lifting. Wiseco goes to great lengths to make sure you get this right, even if you don’t check it. Filing Gaps 1. Forged piston kits are available from Wiseco for a wide range of applications, and include the piston, ring(s), wrist pin, and circlips. A back clearance of .008 - .012 inch is typical to racing and high performance pistons. Many engine builders go to great lengths to file precision end gaps, but ring clearance in the groove frequently goes unchecked and the quality of the ring groove sealing surface is rarely considered. That’s one area where Wiseco extends the extra engineering effort to ensure maximum performance from its pistons. Expert Advice. Clearance and ring groove quality are frequently assumed. If the ring groove is too thin to measure with a caliper depth scale, a machinist’s scale is another option. Ring grooves must be perfectly perpendicular to the cylinder wall so cylinder pressure can press the ring down against the land and out against the cylinder wall for optimum sealing. Copyright © Wiseco Piston Company Inc. All Rights Reserved. NOS WISECO PISTON RING 1974-1976 G4TR 1976-1980 YZ80 1976-1980 MX80 1949L. PISTONS 101, Wiseco pistons … Some builders measure the groove itself with a stack of feeler gauges and then compare it to measuring the ring thickness with a micrometer. Hence it is important that you use the rings specified by your piston manufacturer or be prepared to share your ring pack information if you are providing your own rings. Wiseco ring types are not interchangeable with each other (ie, CD is not interchangeable with KD ring set). One of the most critical problems accompanying severe racing and high performance piston applications is the potential for "microwelding." All Wiseco Sport Compact kits come with 1mm x 1.2mm x 2.8mm XX ring sets. Wiseco Pistons, Rings & More The name Wiseco is synonymous with pistons. It should be noted that ring grooves (especially the top groove) do not expand evenly since material thickness is not uniform due to dome profiles, dish profiles and valve reliefs. Many applications can also be purchased with a complete top-end gasket kit from Wiseco. Everything You Wanted to Know about Piston Ring Grooves. The back-space dimension is critical because it controls the ring’s response time. Never use OEM ring end gap specs, as the material and applications are wildly different. Wiseco … These pistons include thicker decks and performance optimized piston ring lands. Piston orientation is extremely critical when you look at asymmetrical valve reliefs, but other aspects of the piston design are also affected. Wiseco is a world leader in piston technology because it focuses on the minute details of cylinder sealing science. With today’s thin rings, some racers run side axial clearance as tight as 0.0004 - 0.0005-inch, using gas ports to supplement ring pressure. Performance, Pistons have wear and friction reducing skirt coating. A slight drag will indicate the proper clearance. Mike Magda. But the ring grooves in pistons also play a major role in sealing combustion pressure and controlling oil and blow by. For best results the ring groove must offer the ideal clearance and freedom of movement for the ring and it must provide a hard, flat sealing surface for the ring to bear against under high cylinder pressure. It frequently accompanies high temperature endurance and/or supercharged applications where ring placement is too high on the piston and too close to elevated combustion temperatures, or in endurance applications where severe conditions are ongoing. Piston ring grooves serve a larger purpose than simply supporting the rings. Wiseco. I just purchased a Wiseco Forged Performance clutch basket, are there any special things I need to … Forced induction and nitrous applications that are subjected to extreme thermal and pressure shock loads typically require moving the top ring down from the piston top to about 0.300in. 11132P208 Wiseco Piston Unchromed 2.770" X .640 x .490. The cross-hatch in the cylinder walls induces rotation of the rings. In many cases this is also dictated by valve size and positioning, valve pocket requirements, the radial width of the top ring and the piston pin location. October 12, 2017 / by Call 800-505-3274 or Shop Online. Vertical and horizontal gas ports in pistons are also an accepted way of routing cylinder pressure to the back of the ring. It is manufactured using high-quality … Racers in the Super Stock classes always locate the top ring as high as possible to ensure stability of the ring pack and to promote a more active and thorough combustion event. They impact combustion sealing, oil control, friction, and many more engine attributes. Oval track and road racing pistons use horizontal gas ports at the top of the ring groove to resist carbon buildup while shorter duration drag racing engine use more effective vertical gas ports. www.denniskirk.com. Wiseco is a world leader in piston … Once you’ve removed the rings from the box, you’ll see that the 2 nd groove ring has a dot on the top and an inside bevel at the bottom. Tech. Stothers also explains that piston skirt design is another critical aspect. Best selection, low prices & orders over $89 ship free. Easy Returns. It supports top ring sealing by relieving pressure and it helps reduce ring flutter due to pressure changes. All Wiseco pistons are forged from high silicon, low expansion aluminum alloy. When you first open the box, you will see that the tabs say “1”, “2” or “3” to show which groove the rings are. During the combustion event, cylinder pressure follows a path down the crevice volume and into the ring groove above the ring. These pistons are designed to accommodate the reluctor ring on stroker cranks without having to notch the … Includes piston and rings, no wrist pin. Part Number: WIS-RCS08450 Not Yet Reviewed Microwelding damages the piston ring or ring groove sealing surface when localized friction welding causes the transference of material from the ring land to the ring side, most often the bottom ring side. “D-wall” is the standard automotive thickness (SAE standard) and it’s calculated by bore diameter divided by 22. Wiseco pistons come with 1 piston, ring set, wrist pin, and circlips. WISECO PISTON … Ultra-thin, low tension rings need combustion pressure provided by gas porting to achieve optimum sealing. Wiseco Piston Rings Part #: 2362CD. Axial ClearanceThe vertical clearance remaining in the piston ring groove after the ring is installed. 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