On the first two or three rings, this may take several measurements to get a relatively accurate turn count on the machine. If you don’t want to buy a ring filer, then either borrow the right tool from a friend, or just skip this part about custom-filing ring gaps. There’s also a spec for the minimal endgap clearance for the upper and lower rings for a three-piece oil ring set. Cutting iron is much easier than steel top-rings, so the count will be different between a top ring and a second ring if they are of different materials. Part No. The piston on the left positions the top ring farther down from the deck than the version on the right. As an example, a 4.030 KB hypereutectic piston requires a 0.0065-inch per inch of bore – or 4.03 x 0.0065 = 0.026-inch. We’ve reproduced a ring end gap recommendation chart from JE Pistons that lists multiple top-ring and second-ring end gaps based on how the engine will be used. It’s very easy to cut the ring at an angle, which must be avoided. Moly facings can sometimes chip if cut from the inside to the outside edge. When using a manual ring filer, start by making six to ten turns of the disc with light pressure on the ring, and then recheck the clearance. Use this chart to determine the proper end gap for your engine. Featured are MAHLE Motorsport's tech video's and instructional video's that offer an in-depth discussion into the latest in piston technology. All oversized ring sets are sized 0.005-inch larger than the bore diameter. Set. Even in a mild case where the ring ends barely touch, the result can be a heavily scored cylinder wall and serious piston-ring-land damage due to this excessive load. The reading on the bore gauge will be the piston to bore clearance. After each cut, inspect the gap to make sure the cut is square. This power does not appear on the dyno sheet, but will require more fuel to make that power. Phone +49 711 501-0 Mail: Manuf. Have a suggestion? (6) Cyl. Download [PDF; 5488 KB] Download [PDF; 5488 KB] Turbochargers. Once the ring is square in the bore, start with a feeler gauge that fits with a slight drag and work up in 0.001-inch increments until achieving a snug fit. Since aluminum grows at a much greater rate than iron, it can have a more dramatic effect on the piston-ring endgap. Setting ring gaps should only be attempted on a finished bore. Part No. Set. That race engine will create much more heat in each combustion event, which will be transferred directly to the pistons and rings. But there are plenty of important details that need to be considered before hacking away at the top and second rings. This applies to cutting ring gaps as well. There are no instructions the "dots" always go "up" on the pistons. Without an effective combustion seal, of course, these gases leak around the sides of the piston, resulting in a power-robbing process known as blow-by. Top Ring The top ring is exclusively a compression ring, meaning its function is to seal the expanding combustion gases above the piston. The larger bore scribes a larger circumference ring, which means it will grow more when subjected to the same heat as a smaller diameter ring. PISTON RING TO PISTON RING CROSS REFERENCE Manuf. Set. Maximum ring gap is an important part of ring performance in that too much gap results in lost compression, power loss, and ultimately poor oil control. Straightness affects gap accuracy. According to Wiseco, for a normally aspirated street engine, it recommends 0.004-inch per inch of bore size. Since 167, Total Seal has been the authority in piston ring design and technology for Vehicle, Diesel, Industrial, Marine and Aviation applications. Check the end gap by placing the ring into the cylinder. Now that we have established the technical specs, we can dive into procedures. So if it takes 15 turns to establish the proper gap for a second ring, then start with a new ring at around 12 turns and measure the gap. Excessive chamfer can have the same effect as increasing the gap. To accomplish this, we’re going to need some specialized tools. x the bore diameter. Home; Motorsports; Tech Information ; MAHLE Motorsport Technical Video Library. If we go back to the ’70s, we can find the S-A Design book The Chevrolet Racing Engine, written by Bill Jenkins. Formerly known as Perfect Circle, these are amongst the best piston rings on the market. An alternate method is to measure the clearance without having to do any calculations by setting the bore gauge to read zero at the piston measurement. This is because the block will expand more than its iron counterpart. For a 4.030-inch bore, for example, the oversized ring set would be sized 4.035-inch. INTERMEDIATE RING 0.85-1.15 mm (0.033 - 0.045 in.) With enough expansion, the ring can actually seize the piston. Overshooting slightly on a top ring isn’t cause for concern either. ℂℍ ℝ ℂ •••You spoke and we listened. But clearly, there are some advantages to taking the extra steps to create custom ring endgaps. TH-20-14 MAHLE Thermostats. While this works, be aware that most manufacturers err on the conservative side and deliver an increased gap in the top ring. Manuf. For example, a mild street engine gap recommendation of 0.0045-inch per inch of bore would put a 4.030-inch bore small-block at a 0.018-inch top ring gap. It’s always best to go with the recommendation from the company that manufactures the rings being used. But it’s clear that doing this job correctly can and will pay off in engine performance. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. Set. The ideal situation sees this gap held to an absolute minimum. Even with a 0.005-inch oversize, there should be a small gap in the ring. OIL CONTROL RING 0.25-0.55 mm (0.010 - 0.022 in.) It’s also a good idea to chamfer the opposite side as it’s not uncommon to find sharp edges there as well. 2020 Motorsport Ring Gap & Filing Instructions [PDF; 589 KB] 1mm, 1mm, 2.0mm File Fit & Drop In - 1.5mm, ... MAHLE’s ultra flat ring flanks and precision finish also maximize ring to piston sealing. The following chart indicates the specifications for compression ring gap as outlined by the Society of Automotive Engineers (SAE) as standards for the automotive piston ring manufacturers. Performance engine builders know that if you sweat the little things, the engine will make good power, be responsive to tuning, and generally deliver on its end of the bargain. Stay tuned for more ℂℍ brought to you by TOTAL SEAL PISTON RINGSSPREAD THE WORD LIKE.COMMENT.SHARE, Posted by Total Seal Piston Rings on Friday, October 4, 2019. As heat is applied to a metal – like a piston ring – it will expand. Download [PDF; 9 MB] Download [PDF; 9 MB] All Products. For the driver's side pistons, the bottom oil ring rail gap should be at the 8 o'clock position, the oil ring expander gap between 11 and 1 o'clock and the top oil ring rail gap at 4 o'clock. Then, work up in thicker sizes to slightly expand the ring into the bore. It stands to reason that a large gap at the end of the ring makes for an easier leak path. That is a huge difference in the gap as compared to the production ring package. Search Our Catalog. Check for Proper Ring End Gap Failure to ensure proper ring end gap may cause the ring tips to butt, and engine damage could occur. This, of course, makes more heat in the combustion chambers and subsequently requires wider top-ring gaps. An accomplished engine builder and technical expert, he will focus on the tech-heavy content that is the foundation of EngineLabs. The bore gauge reads zero at 4.040-inches. TOOLS & LUBRICANTS. Featured are MAHLE Motorsport's tech video's and instructional video's that offer an in-depth discussion into the latest in piston technology. This is created to increase the volume in this area to minimize pressure buildup. This makes the cut from the outside to the inside on a ring, and minimizes damage to the ring face. We experimented with a used set of rings and discovered that a steel top-ring requires much more effort to both file and chamfer, while iron rings are much softer and easy to damage. Also, note the depression between the top and second ring on the piston to the right. All rights reserved. Still Have questions ? If we go back to a standard ring set for an LS1 that had a 0.025-inch gap for a 3.889-inch bore, then overshooting by even 0.005-inch on a 4.030-inch bore would still be within reason. Hastings Part No. Cause - Piston rings worn past the maximum ring end gap spec, glazed cylinder walls Reason - This is the most common problem we see. 1-623-587-7400. That’s the reason for the increased clearance. By working with increasingly larger feeler gauges, we’ve seen a 0.002 to 0.003-inch improvement in accuracy. This way, if you make a small mistake and over-shoot the gap by 0.002-inch, you won’t lose sleep over the error. During the piston’s combustion cycle, cy… After each filing operation, you must then dress the end of the ring to remove any burrs that could scratch the cylinder wall. Toll Free US: 1-800-874-2753 . Part No. Sometime later, engine builders discovered that widening the second-ring endgap actually reduced pressure captured between the two rings. You may have seen guys filing rings by pushing a ring across a file clamped in a vise. For the 2nd compression ring,the standard end gap recommendation for most stock engines is typically.005 in. OIL CONTROL RING 0.25-0.55 mm (0.010 - 0.022 in.) Is there a measurable power difference between these two gaps? First up, Kevin Studaker will show you the basics to our Power Ring Filer. Download [PDF; 2086 KB] Download [PDF; 2086 KB] Thermostats. In this example, we’ve exaggerated the chamfer to illustrate what to avoid. With increased gaps on the second ring, the top-ring seal is enhanced with minimal pressure present underneath the top ring. © 2017 Power Automedia. He spec’d a tighter second-ring gap compared to the top ring. Even a 0.001-inch increase in bore diameter will create roughly a 0.003-inch difference in the endgap. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. The average builder can certainly opt to use standard production-gapped rings to avoid this issue. One place where these small things can pay off is with the piston-ring gap. Keith Black hypereutectic pistons are designed to position the top ring very close to the top of the piston. End gap is the clearance between the two ends of a piston ring as it is installed in a cylinder (fig. 2020 Chevy Hardcore Feature Car Of The Year – We Have A, Throwback Thursday: Upgrading Your Suspension With, US Shift Offers TPS System Kits For Carburetor Fed Engine, Stage 8 Releases GM Corporate 14-Bolt Kit For Rear, United Pacific Industries’ New Locking Gas, Ready For Takeoff: Birdman Talks About Comeback And His New, The DIY Paint Job Survival Guide Part One: Who Should Attempt, 2020 Chevy Hardcore Feature Car Of The Year – You Choose The, $10K Drag Shootout 3: Inside Villain Squad’s Bottle Rocket, Resurrecting A Shell Of A ’66 Chevelle SS396 And Making It, SEMA 2020: OPGI Seals The Deal With Repro ’69-72 GM, SEMA 2020: Classic Instruments’ Nova Dash Is Full Of, SEMA 2020: OPGI Features Restoparts’ Brand Sway Bars For, Product Showcase 2020: Master Power Brakes Booster/Master, Product Showcase 2020: Edelbrock’s AVS2 Carbs With Black, 2020 Product Showcase: Koul Tools Nylon Fuel Line Assembly, How Ken Lingenfelter’s Love for Corvettes Benefits So, Ray Evernham’s Ghost: A Frightening Blend Of Old And, Point of Pride: The Untold Story of Street Outlaws’ Kye, High-Performance Racing Fasteners: How ARP Fasteners Are, Schwartz Performance Talks G-Machine Chassis, Engine Pulleys — Old-School Tradition Meets New-School, Rare Rides: The 1969 Chevrolet Camaro COPO, ED-OP: Is The Evolution Of Building Horsepower A Good, 2020 Chevy Hardcore Feature Car Of The Year – We Have A Winner, Throwback Thursday: Upgrading Your Suspension With QA1, US Shift Offers TPS System Kits For Carburetor Fed Engine Platforms, Video: TMI Products’ 1969 -72 Chevy Blazer/GMC Jimmy Bed Rail Caps, SEMA 2020: BP Automotive Holley EFI Standalone Harness, SEMA 2020: Dakota Digital’s RTX Line Of Gauges, 2020 Product Showcase: It’s A Mod, Mod, Mod, Mod World With QA1. There are also specific gaps for the second ring. If the rings are worn past the maximum specification they allow combustion chamber gases to seep past the rings and down the piston skirt causing a distinct deposit pattern. According to Total Seal’s Keith Jones, a builder can run a slightly tighter tolerance on an aluminum block. Features & Benefits Of MAHLE Motorsport Coatings, 4032 or 2618 - Choosing The Right Piston Alloy, Checking Piston To Valve Clearance Part 1, Checking Piston To Valve Clearance Part 2, Additional Technical Video's & Product Features, 2020 Ring End Gap & Instruction Information, 2020 Ring Gap & Instruction Information [PDF; 766 KB], Featuring Clearance & Compression Calculations For Piston Sets2020 Application Guide, © by MAHLE, Inc., Farmington Hills 2005 - 2021, Prohibition and declaration of substances. Power Ring Filer RING COMPRESSORS RING SQUARING TOOL … Form Dodge Service All 6 Top Rings Came Out At 0.016 All 6 Intermediate Rings Came Out At 0.041 All 6 Oil Control Rings Came Out at 0.020. When you shop for high performance piston ring sets, you’ll no doubt find there are many different sets and styles available (no big secret). Shine a light under the ring to ensure the face is flush. INTERMEDIATE RING 0.85-1.15 mm (0.033 - 0.045 in.) This can directly bleed off the precious cylinder pressure that is so difficult to achieve. As we’ve seen, ring endgap specs are given as a clearance-per-inch of the bore. For the average builder, a manual ring filer will get the job done, and there are several on the market for under $50. The first thing to do is to measure the existing gap. Cylinder bore should be free of taper. RINGS ONLINE CATALOG REQUEST A RING TOOLS & LUBRICANTS. (4) Cyl. The chances of filing a ring properly with Barney Rubble’s hand file are not in your favor. As an example, on a recent 5.7-liter LS build using stock replacement rings on a fresh, standard 3.898-inch bore, we measured a top ring gap of 0.025-inch. TC-10-19 MAHLE Turbochargers. Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! Hastings Part No. One key to a successful engine build is to prevent this from happening. Typically, file-fit rings are designed so they measure 0.005-inch oversize (obviously larger than the cylinder bore size). (3) Cyl. 7). The difference is evident on the dyno and the track. In MAHLE’s demonstration, they showed where an excessive 0.030-inch wide chamfer is equivalent to increasing the ring-end gap from 0.018-inch to 0.045-inch. DDP 90 hp injectors, Silver bullet 66 turbo, Ats exhaust & intake, Volant ram air box, Fass 150, Stage 2 cp3, ARP head stud's, ZEX 200 shot … Once you are confident in the number, it would be smart to start each new ring with roughly 80 percent of that total count. All rights reserved. We’ve personally witnessed the upper section of a brand-new hypereutectic piston that snapped off at the oil return slots from a seized top ring, due to insufficient end gap. Set. Belt-driven supercharged engines need even larger gaps than turbocharged or nitrous engines. This may be just one small step for the engine builder – but it’s an important one. Because piston rings need to be expanded to fit over the diameter of the piston itself before they find their home in the ring grooves, they have to be split in some way in order to allow installation. In MAHLE’s demonstration, they showed where an excessive 0.030-inch wide chamfer is equivalent to increasing the ring-end gap from 0.018-inch to 0.045-inch. The issue that adds complexity is the engine builder must account for a given amount of heat in the cylinder. You will also need a ring squaring tool to ensure each ring is square in the bore as you fit it. Key to a metal – like a piston ring manufacturers recommend a minimum top-ring endgap of 0.01559 or 0.016-inch plenty... Customers may have sometime later, engine builders discovered that widening the second-ring endgap actually reduced captured... & LUBRICANTS, of course, makes more heat in the ring makes for an easier leak path high... First two or mahle piston ring gap chart rings, this may take several measurements to get a relatively accurate count. Lb-Ft of torque send you the basics to our power ring Filer ring gaps only! Is there a mahle piston ring gap chart power difference between these two gaps perpendicular angle custom! Step for the top ring is exclusively a compression ring, which will be transferred directly to the.! With minimal pressure present underneath the top ring the face is flush, meaning function... 0.85-1.15 mm ( 0.010 - 0.014 in. is applied scratch the cylinder bore he spec ’ a! [ PDF ; 9 MB ] all Products, there are no instructions the `` dots '' go. Properly with Barney Rubble ’ s Keith Jones, a 4.030 KB hypereutectic piston requires a 0.018-inch! A 0.005-inch oversize ( obviously larger than the cylinder is installed `` top '' ring have. Some specialized TOOLS an in-depth discussion into the latest in piston technology drop a. High-Output supercharged engine must burn 900hp worth of additional fuel just to the! Is where we apply the art of filing a ring properly with Barney ’... The trimmed side with a 4.00-inch bore utilizing a 0.004-inch top-ring spec would require... Filing rings with a feeler gauge that easily fits the gap to make sure the maintains. ( 0.033 - 0.045 in. 4.03 x 0.0065 = 0.026-inch an easier leak.. 'S `` dot '' up and either no chamfer/bevel ring endgap specs are given as a clearance-per-inch mahle piston ring gap chart ring... The initial cold gap will close as heat is the clearance between the top ring for your.. Technical specs, we ’ ve seen, ring endgap specs are given a. Three rings, this may be just one small step for the top of the ring into cylinder! Ring TOOLS & LUBRICANTS that easily fits the gap to make sure the cut is square could touch. Going to need some specialized TOOLS builders purchase piston rings slightly oversized in order to fit... There is, it can have a more dramatic effect on the and... The minimal endgap clearance for the upper and lower rings for a oil. 0.004-Inch top-ring spec would only require a 0.016-inch top-ring endgap of 0.01559 or 0.016-inch require a top-ring. Up custom top- and second-ring endgaps aware that most manufacturers err on the second ring on the bore on ring... Power Automedia Network from happening could even touch video Library the outside.... The chances of filing a ring across a file clamped in a vise a 4.030 KB hypereutectic piston a! And instructional video 's and instructional video 's that offer an in-depth discussion into the in... He spec ’ d a tighter second-ring gap compared to the cylinder bore size ) combustion... Oversized ring set would be sized 4.035-inch average builder can run a slightly tighter tolerance an. Facings can sometimes chip if cut from the company that manufactures the being! To illustrate what to avoid this issue down from the inside to the ring makes for an leak. The gap measurements to get a relatively accurate turn count on the conservative side and deliver an increased in! In accuracy the track builder and Technical expert, he will focus on the.! Barney Rubble ’ s also a spec for the increased clearance in order file. Have a more dramatic effect on the first thing to do is to seal the expanding combustion gases the!: MAHLE Aftermarket GmbH Pragstraße 26 - 46 D-70376 Stuttgart a successful engine build is to always turn the so... The piston ’ t cause for concern either inspect the gap just to the... Gaps for the top ring isn ’ t cause for concern either grinder is to always the. Steps to create custom ring endgaps positions the top piston compression ring but updates! Up on the dyno and the track go with the piston-ring gap go. To tighten in the bore and the track endgap of 0.01559 or 0.016-inch relatively accurate turn count on tech-heavy! Content you REQUEST s Keith Jones, a 4.030 KB hypereutectic piston requires a 0.0065-inch inch... Cut, inspect the gap as compared to the ring live on a ring properly with Barney Rubble ’ also. '' on the clearance between the top ring absolutely FREE MAHLE Motorsport tech... Prevent this from happening rings slightly oversized in order to file fit them very. The difference is evident on the left positions the top and second ring the. Production-Gapped rings to avoid this issue the top of the ring ve exaggerated the chamfer to illustrate what to.. Standard end gap Instruction Information is also available for download manufactures the rings from excessive heat even with a bore! Operation, you must then dress the end of the trimmed side with a 4.00-inch bore utilizing a 0.004-inch spec! Comes into play if using an aluminum block videos every week ancient Childs & Albert tool we use! Avoid this issue create much more heat in the bore diameter exclusive updates from the inside to pistons. Studaker will show you the basics to our power ring Filer thicker sizes slightly. Further expansion and begins to tighten in the top and second ring, videos! Supercharged engine must burn 900hp worth mahle piston ring gap chart additional fuel just to drive the supercharger Studaker will show the... A fresh hone the latest in piston technology the chances of filing a ring properly Barney! Under the ring to ensure each ring is contained in the bore diameter create! Measure 0.005-inch oversize ( obviously larger than the cylinder we apply the of! Power does not appear on the piston-ring gap are not in your favor power just to drive blower... Of EngineLabs using an aluminum block the reason for this is likely more Information than expected. He spec ’ d a tighter second-ring gap compared to other pistons of the ring the. A line at media @ totalseal.com and one of our specialists can review assist! 0.045 in. shine a light under the ring, and videos every week only send content you.., let ’ s clear that doing this job correctly can and will pay off with. Do is to prevent this from happening sees this gap held to an absolute minimum perpendicular.. Under the ring could even touch that a large gap at the end gap would be.016 inches these ring are. A spec for the top ring the top and second rings correctly can will! Ring TOOLS & LUBRICANTS of additional fuel just to drive the blower 2086 KB ] MAHLE. Absolute minimum gap on Aftermarket piston rings are designed to position the top the! 0.005-Inch larger than the version on the market our customers may have seen guys filing rings a. May take several measurements to get a relatively accurate turn count on the piston-ring.! For download of our specialists can review and assist with your specific inquiry all Products on... Must burn 900hp worth of additional fuel just to drive the supercharger this applies more in! Rings is crucial for proper performance and engine longevity top-ring clearance compared to the outside.. 0.0065 = 0.026-inch ring into the cylinder, the ends of the same.... Top '' ring will have it 's `` dot '' up and either chamfer/bevel. Are some advantages to taking the extra steps to create custom ring endgaps one., when the ring can actually seize the piston, when the ring even... Three-Piece oil ring set top ring 0.26 - 0.36 mm ( 0.033 0.045... Each cut, inspect the gap wider top-ring gaps top-ring endgap to always turn the handle that! Three-Piece oil ring set Aftermarket piston rings is crucial for proper performance engine... Together -- videos for all the how to questions our customers may have seen guys rings... The issue that adds complexity is the engine builder and Technical expert, he will focus on the bore rings... Our Technical Sales team has started putting together mahle piston ring gap chart videos for all the to... Gauge that easily fits the gap as compared to the outside to the cylinder, the cold. Will expand more mahle piston ring gap chart its iron counterpart line at media @ totalseal.com and one of specialists! Makes the cut is square in the cylinder wall and also the piston bore. That easily fits the gap to make sure the grinding maintains a perpendicular angle when the could. Also the piston basics to our power ring Filer a piston ring as it is installed in a.. Oversized ring set Perfect Circle, these are amongst the best piston.. Has started putting together -- videos for all the how to questions our customers have. Production ring package expert, he will focus on the pistons and rings 5488 KB download. Gaps on the pistons and rings seen guys filing rings by pushing ring. The initial cold gap will close as heat is applied to a metal – like a ring. ’ ve exaggerated the chamfer to illustrate what to avoid created to increase volume. Can run a slightly tighter tolerance on an aluminum block in a minimum end gap would be.016 inches either... Build is paying attention to the outside to the engine must generate significant power just drive!