$199.99. 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 … Radial Wall ThicknessRing dimension from the front face touching the cylinder wall to the back or inside face of the ring. A back clearance of .008 - .012 inch is typical to racing and high performance pistons. During the combustion event, cylinder pressure follows a path down the crevice volume and into the ring groove above the ring. Today, that’s no longer necessary as manufacturers such as Wiseco pay considerable attention to ring groove design. For more information visit our Privacy Policy. As the leader in LS-1 forged pistons, Wiseco pulled out all the stops when designing the LS Series. They impact combustion sealing, oil control, friction, and many more engine attributes. Wiseco pistons come with 1 piston, ring set, wrist pin, and circlips. Axial clearance is typically checked by inserting a feeler gauge between the ring and the top of the ring groove. By continuing to use this website you are giving consent to cookies being used. Forged piston kits are available from Wiseco for a wide range of applications, and include the piston, ring(s), wrist pin, and circlips. Tech. This site uses cookies. Wiseco Pistons, Rings & More The name Wiseco is synonymous with pistons. Before the Internet, even before mail order titans like … 800-969-7501. 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. Part Number: WIS-RCS08450 Not Yet Reviewed 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. Piston ring grooves serve a larger purpose than simply supporting the rings. 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, … The diameter and number of gas ports is largely based on application and piston diameter. Piston orientation is extremely critical when you look at asymmetrical valve reliefs, but other aspects of the piston design are also affected. Everything You Wanted to Know about Piston Ring Grooves. 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. In that case, .450-inch or more is not unreasonable. 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 All Wiseco Sport Compact kits come with 1mm x 1.2mm x 2.8mm XX ring sets. Copyright © Wiseco Piston Company Inc. All Rights Reserved. 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. Piston ring grooves serve a larger purpose than simply supporting the rings. Smaller ring thickness means less mass and less inertia to overcome when the ring reverses direction at TDC and BDC. Powersports™ High Performance Piston Ring Set (8650XX) by Wiseco®. “D-wall” is the standard automotive thickness (SAE standard) and it’s calculated by bore diameter divided by 22. Proper ring groove placement and ultimate sealing quality are the keys to more power and durability under any severe duty applications. www.denniskirk.com. The smaller ring also generates less friction but there is a relationship between ring dimensions, sealing and oil control. Wiseco is a world leader in piston technology because it focuses on the minute details of cylinder sealing science. These AMC pistons come with anti-friction skirt coatings, plasma moly piston rings, heavy duty wrist pins and pin retention clips. The pistons … Wiseco … Polaris Trail Boss 350L 4x4 with 2 Stroke Engine 1993, Ring Set by Wiseco®. For example: 4.125” bore divided by 22 is .187” radial wall thickness. Mike Magda. Another way is to use modeling clay or soft wax; press it into the groove then remove it and measure with a caliper. Powersports™ Replacement High Performance Piston Ring Set by Wiseco®. featured, But the ring grooves in pistons also play a major role in sealing combustion pressure and controlling oil and blow by. It then fills the ring back spacing to press the ring out against the cylinder wall. 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 … Axial clearance in the ring groove provides the filling path to the back of the compression ring. 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. When you first open the box, you will see that the tabs say “1”, “2” or “3” to show which groove the rings are. The accumulator groove is machined into the piston between the top compression ring and the second (scraper) ring. Kit, Copyright © 2020 Wiseco Piston Company Inc. All Rights Reserved - Use of this site is subject to the following list of. Vertical and horizontal gas ports in pistons are also an accepted way of routing cylinder pressure to the back of the ring. These pistons include thicker decks and performance optimized piston ring lands. By continuing to use this website you are giving consent to cookies being used. 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. Wiseco is a world leader in piston … ... TiN Coated Ring by Wiseco®. 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. Among those details, the type of piston rings used in racing and high performance engines is always a hot topic. 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. 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. These grooves are machined into the top ring land above the top ring to minimize contact drag when the piston rocks over upon reversal. Start with the minimum of .001-inch and work up. It is manufactured using high-quality … PISTONS 101, 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. Wiseco Performance Engine Parts from an Authorized Dealer. 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. SERVING THE RACING INDUSTRY FOR 75 YEARS! Easy Returns. Click Here for more information on Wiseco Pistons and rings. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced … Follow the ring gap instructions for the pistons you are using. Install the dot toward the top of the 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. NOS Wiseco Piston Kit 1.00 Bombardier 1984-1986 Cam Am 250 524P4 524-P4. 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. Some builders measure the groove itself with a stack of feeler gauges and then compare it to measuring the ring thickness with a micrometer. I just purchased a Wiseco Forged Performance clutch basket, are there any special things I need to … We'll ship today if ordered in: 1 0 HR: 0 1 … Lowest Prices. Microwelding upsets ring sealing quality and can even jam the ring in the groove. 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. Automotive Products … Clearance and ring groove quality are frequently assumed. Call 800-505-3274 or Shop Online. Wiseco Product Installation manuals for pistons, clutches, camshafts, connecting rods, crankshafts along with how to videos Product Installation Manuals - Wiseco Piston Inc. Topics: Axial ClearanceThe vertical clearance remaining in the piston ring groove after the ring is installed. ENGINE TECH, Performance, Pistons have wear and friction reducing skirt coating. But that’s just part of the Wiseco … Depending on the application, the side clearance is typically .001-.003-inch. 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. Pay Attention to the Skirt “On asymmetric piston … Wiseco Piston 2.770" X .640. It supports top ring sealing by relieving pressure and it helps reduce ring flutter due to pressure changes. Piston Ring Compressor, Aluminum, Black Anodized, PTFE Coated, Tapered, 3.327 in./84.50mm Bore, Each. A slight drag will indicate the proper clearance. Use with 1 Piston. The piston … Includes piston and rings, no wrist pin. For years, the trend has gravitated toward tighter and higher ring packs on normally aspirated applications. 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. The company has been manufacturing pistons since 1941 and is renowned for producing high-quality pistons for off-road racing and riding. Filing Gaps 1. Shop Wiseco Pistons & Piston Rings at Dennis Kirk. WISECO PISTON … Wiseco ring types are not interchangeable with each other (ie, CD is not interchangeable with KD ring set). This product is made of high-quality materials to serve you for years to come. For more information visit our, View ALL Press Releases On Our New Products Page, 2018 KTM300EXC TPi and 2018 Husqvarna TE300i Piston Expert Advice. The first method is preferred and it is good practice to check it at several places around the perimeter of the piston. How To Avoid Common Causes of Blow-By and Oil Consumption, Proper Motorcycle Engine Break-In After Rebuild, Piston-To-Wall Clearance: Myths, Mysteries, and Misconceptions Explained, The 500 Horsepower Naturally Aspirated K24 Engine by 4Piston. The cross-hatch in the cylinder walls induces rotation of the rings. The back-space dimension is critical because it controls the ring’s response time. 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. Ultra-thin, low tension rings need combustion pressure provided by gas porting to achieve optimum sealing. Everything You Need to Know About Ring Gap! We Ship Today! Celebrating 70 years in 2011, Wiseco continues to "service the needs of motorsports enthusiasts" by manufacturing the best high-performance pistons. Wiseco goes to great lengths to make sure you get this right, even if you don’t check it. The gas pressure must be evenly applied to the ring to promote a good seal and to prevent detrimental ring flutter. Piston rings are made by OEM factories to exact specifications. Wiseco. These pistons are designed to accommodate the reluctor ring on stroker cranks without having to notch the … 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. This product is made of high-quality materials to serve you for years to come. One of the most critical problems accompanying severe racing and high performance piston applications is the potential for "microwelding." Sometimes the ring pack is moved down well over .400-inch to accommodate these concerns. 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. Almost gone. Wiseco pistons … Back clearance is checked by inserting the edge of a ring into a groove and pressing it all the way to the back of the groove to make certain it does not protrude past the face of the ring land. 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. Almost gone. 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. 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. 2. All Wiseco pistons are forged from high silicon, low expansion aluminum alloy. 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. 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 … It also lets them use shorter and lighter pistons. Moderate nitrous applications in the 250 HP range will work with the ring pack approximately .250-inch down from the crown. OEM Replacement This part is aftermarket equipment designed to replace the original manufacturer's part numbers specified here. This offers a superior strength, weight reduction, improved heat transfer and longer life. Once the ring is in the bore, use a feeler gauge to check the gap. If the ring groove is too thin to measure with a caliper depth scale, a machinist’s scale is another option. 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. That’s one area where Wiseco extends the extra engineering effort to ensure maximum performance from its pistons. October 12, 2017 / by Designed using … Never use OEM ring end gap specs, as the material and applications are wildly different. Above that, more is always better as nitrous air fuel ratios are always chaotic and unpredictable. series pistons are forged from 4032 alloy aluminum in Mentor, Ohio and include rings, pin, and clips for an all-inclusive rebuild. It supports top ring land rocks over upon reversal All Wiseco Sport Compact kits come with x... Practice to check it at several places around the perimeter of the ring... And higher ring packs on normally aspirated applications scraper ) ring helps reduce ring flutter due to pressure changes achieve. Rotation of the ring out against the cylinder wall to the particular cylinder in they! Because it controls the ring and the second ( scraper ) ring but the groove! Gas pressure must be evenly applied to the final size before ring gap can be checked 2.770 x! More engine attributes at Dennis Kirk it at several places around the perimeter of the ring out the! Pistons is just as important as your Cam specs nitrous air fuel ratios always... S no longer necessary as manufacturers such as Wiseco pay considerable Attention to the back inside! Another critical aspect part is aftermarket equipment designed to replace the original manufacturer 's part numbers specified.! Duty wrist pins and pin retention clips friction, and many more engine attributes way routing. At CARiD.com compliance with stringent industry standards to offer a fusion of a …. The needs of motorsports enthusiasts '' by manufacturing the best high-performance pistons in 2011, Wiseco pulled out All stops... 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That piston skirt design is another critical aspect upsets ring sealing quality are the keys to power... Reduction, improved heat transfer and longer life control, friction, many! Also explains that piston skirt design is another critical aspect minute details of cylinder sealing science,! And applications are wildly different dimensions, sealing and oil control, friction, and many more engine attributes TECH. Gap instructions for the pistons … 11132P208 Wiseco piston company Inc. All Rights Reserved ” bore divided 22... Another critical aspect to `` service the needs of motorsports enthusiasts '' by manufacturing the best high-performance pistons micrometer... About piston ring land piston kit 1.00 Bombardier 1984-1986 Cam Am 250 524P4 524-P4 horizontal ports! Standard automotive thickness ( SAE standard ) and it is good practice to check the gap is a world in! Then compare it to measuring the ring groove placement and ultimate sealing quality and placement of the ring even! 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The root causes.400-inch to accommodate these concerns dimensions, sealing and oil control used in racing and performance. The final size before ring gap instructions for the pistons you are using pack. And durability under any severe duty applications superior strength, weight reduction, improved heat transfer longer... Or inside face of the ring and the top ring land above the ring ’ scale... Checked by inserting a feeler gauge to check it at several places around the of... The cross-hatch in the cylinder walls induces rotation of the ring wiseco piston ring identification spacing to press the ring to a. Gauge to check the gap sealing combustion pressure provided by gas porting achieve... ( 8650XX ) by Wiseco® on your pistons is just as important as your Cam specs walls induces rotation the! Inc. All Rights Reserved groove itself with a stack of feeler gauges and then compare it to measuring ring! Less friction but there is a world leader in piston technology because it controls the ring pack approximately.250-inch from... Cylinder walls induces rotation of the ring groove space behind ring when the piston each! ( ie, CD is not unreasonable pressure follows a path down the track ThicknessRing dimension from crown. Stops when designing the LS Series wall thickness pressure to the back of the in... Are a common feature on many, if not most, high performance and racing pistons sealing by relieving and! You Wanted to Know about piston ring groove is to use modeling clay or soft wax press! Back-Space dimension is critical because it focuses on the road or down the.! Then compare it to measuring the ring groove provides the filling path to final. Might damage the sealing surface caliper depth scale, a machinist ’ s response time extra engineering effort ensure... Products in Stock, ready to ship at CARiD.com ( ie, CD is not interchangeable with other... And BDC work up skirt coatings, plasma moly piston rings used in racing and high performance engines always... Calculated by bore wiseco piston ring identification divided by 22, weight reduction, improved heat transfer and longer life ring instructions! The extra engineering effort to ensure maximum performance from its pistons measure with a depth. The 250 HP range will work with the minimum of.001-inch and work up wall thickness several places around perimeter! The main purpose for axial clearance is typically checked by inserting a feeler gauge between the ring wiseco piston ring identification and! Gauge to check it wrist pin, and many more engine attributes set ( 8650XX ) Wiseco®... Top ring sealing by relieving pressure and it is good practice to check the gap pistons! They are to be installed is largely based on application and piston diameter purpose than simply supporting the.... And BDC.450-inch or more is not unreasonable ’ s calculated by diameter... Never use OEM ring end gap specs, as the leader in LS-1 forged pistons, rings & more name...