The quality and placement of the ring grooves on your pistons is just as important as your cam specs. During the combustion event, cylinder pressure follows a path down the crevice volume and into the ring groove above the ring. Axial clearance in the ring groove provides the filling path to the back of the compression ring. Expert Advice. 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. Another way is to use modeling clay or soft wax; press it into the groove then remove it and measure with a caliper. We Ship Today! Above that, more is always better as nitrous air fuel ratios are always chaotic and unpredictable. We'll ship today if ordered in: 1 0 HR: 0 1 … NOS WISECO PISTON RING 1974-1976 G4TR 1976-1980 YZ80 1976-1980 MX80 1949L. 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. Wiseco is a world leader in piston technology because it focuses on the minute details of cylinder sealing science. High temperature and excessive movement are the root causes. 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. $199.99. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced … Piston Ring Compressor, Aluminum, Black Anodized, PTFE Coated, Tapered, 3.327 in./84.50mm Bore, Each. As the leader in LS-1 forged pistons, Wiseco pulled out all the stops when designing the LS Series. Tech. 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. Axial ClearanceThe vertical clearance remaining in the piston ring groove after the ring is installed. The main purpose for axial clearance is to allow the ring to spin. A back clearance of .008 - .012 inch is typical to racing and high performance pistons. October 12, 2017 / by Shop Wiseco Pistons & Piston Rings at Dennis Kirk. All Wiseco Sport Compact kits come with 1mm x 1.2mm x 2.8mm XX ring sets. 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. Conversely, a 5.400" diameter piston … 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. By continuing to use this website you are giving consent to cookies being used. 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 … The diameter and number of gas ports is largely based on application and piston diameter. 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. 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 The first method is preferred and it is good practice to check it at several places around the perimeter of the piston. The back-space dimension is critical because it controls the ring’s response time. WISECO PISTON … It then fills the ring back spacing to press the ring out against the cylinder wall. Before the Internet, even before mail order titans like … 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. Wiseco ring types are not interchangeable with each other (ie, CD is not interchangeable with KD ring set). 11132P208 Wiseco Piston Unchromed 2.770" X .640 x .490. These pistons include thicker decks and performance optimized piston ring lands. Gas ports deliver direct cylinder pressure behind the ring to seal the ring against the bottom surface of the ring land and to force it outward against the cylinder wall. Designed using … Lowest Prices. www.denniskirk.com. Too much back spacing makes the ring slow to respond, but there must be some clearance so the ring can move and conform during all dynamic conditions. But that’s just part of the Wiseco … SERVING THE RACING INDUSTRY FOR 75 YEARS! A slight drag will indicate the proper clearance. Wiseco pistons … Forged piston kits are available from Wiseco for a wide range of applications, and include the piston, ring(s), wrist pin, and circlips. 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. Start with the minimum of .001-inch and work up. The company has been manufacturing pistons since 1941 and is renowned for producing high-quality pistons for off-road racing and riding. When you first open the box, you will see that the tabs say “1”, “2” or “3” to show which groove the rings are. Wiseco Performance Engine Parts from an Authorized Dealer. Ultra-thin, low tension rings need combustion pressure provided by gas porting to achieve optimum sealing. For any build budget, Wiseco has the piston to get you on the road or down the track. Accumulator grooves have proved most effective and they are a common feature on many, if not most, high performance and racing pistons. That’s one area where Wiseco extends the extra engineering effort to ensure maximum performance from its pistons. Copyright © Wiseco Piston Company Inc. All Rights Reserved. 800-969-7501. Smaller ring thickness means less mass and less inertia to overcome when the ring reverses direction at TDC and BDC. All Wiseco pistons are forged from high silicon, low expansion aluminum alloy. 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. This product is made of high-quality materials to serve you for years to come. 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. Wiseco Piston Rings Part #: 2362CD. Vertical and horizontal gas ports in pistons are also an accepted way of routing cylinder pressure to the back of the ring. NOS Wiseco Piston Kit 1.00 Bombardier 1984-1986 Cam Am 250 524P4 524-P4. Almost gone. Piston ring grooves serve a larger purpose than simply supporting the rings. 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. 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. Everything You Wanted to Know about Piston Ring Grooves. If the ring groove is too thin to measure with a caliper depth scale, a machinist’s scale is another option. Powersports™ Replacement High Performance Piston Ring Set by Wiseco®. PISTONS 101, Install the dot toward the top of the piston. For more information visit our, View ALL Press Releases On Our New Products Page, 2018 KTM300EXC TPi and 2018 Husqvarna TE300i Piston 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. By continuing to use this website you are giving consent to cookies being used. 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. 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. Microwelding upsets ring sealing quality and can even jam the ring in the groove. Radial Back Clearance   Ring groove space behind ring when the ring face is flush with piston ring land. I just purchased a Wiseco Forged Performance clutch basket, are there any special things I need to … In that case, .450-inch or more is not unreasonable. This offers a superior strength, weight reduction, improved heat transfer and longer life. 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 … Moderate nitrous applications in the 250 HP range will work with the ring pack approximately .250-inch down from the crown. 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. Mike Magda. “D-wall” is the standard automotive thickness (SAE standard) and it’s calculated by bore diameter divided by 22. Polaris Trail Boss 350L 4x4 with 2 Stroke Engine 1993, Ring Set by Wiseco®. Almost gone. Proper ring groove placement and ultimate sealing quality are the keys to more power and durability under any severe duty applications. 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. Follow the ring gap instructions for the pistons you are using. The smaller ring also generates less friction but there is a relationship between ring dimensions, sealing and oil control. Pay Attention to the Skirt “On asymmetric piston … These grooves are machined into the top ring land above the top ring to minimize contact drag when the piston rocks over upon reversal. Wiseco. Axial clearance is typically checked by inserting a feeler gauge between the ring and the top of the ring groove. 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. These pistons are designed to accommodate the reluctor ring on stroker cranks without having to notch the … Among those details, the type of piston rings used in racing and high performance engines is always a hot topic. 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. It also lets them use shorter and lighter pistons. 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. For years, the trend has gravitated toward tighter and higher ring packs on normally aspirated applications. 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