The truth is, we are striving to build the "State of the Art" piston that is best, regardless of price. The 4032 performance piston alloy has a silicon content of approximately 11%. The difference between a normal or cast piston and a forged piston is the manufacturing technique. These pistons are manufactured from aluminum alloy that contains 16 percent silicon for greater strength and wear resistance. He also told me usually only does moly rings with forged pistons. Any silicon that is added to aluminum above a 12% content will retain a distinct granular form instead of melting. The biggest drawback of adding silicon to pistons is that the piston becomes more brittle as the ratio of silicon is added. Special molds, casting, and cooling techniques are required to obtain uniformly dispersed silicon particles throughout the piston material. The heat expansion cannot be controlled and is therefore often not completely round since the piston pin requires some material on the inside. A hypereutectic piston is one that has greater than 12.5 percent silicon in its metal composition, usually around 16 to 18 percent. Speed-Pro products offer increased durability, reduced weight, higher temperature resistance, and superior oil control for maximum horsepower production and peak performance. Interestingly, when a modern forged piston with more initial cold clearance reaches operating temperature, the difference in running clearance is less than might be surmised. No Interest if paid in full in 6 mo on $99+Opens in a new window or tab* No Interest if … The Pros and Cons of Reusing Pistons. They're stronger than cast, but not as strong as forged. However, forged pistons are much stronger. 4:56. the thought came up in my head, as i was reading the "dont buy a sled from twsandrew" thread. They are also produced in bulk with most manufacturers only producin… A tight piston is less likely to rock, make noise, and burn oil. Our pricing policy has given the impression to some that we are building an economy, or in between, piston. These types of pistons have numerous benefits. Report. Playing next. Pro: Con: Stronger: Piston noise (when cold) More Ductile: Slightly higher wear rate: someone mentioned something about 27lbs being alot of boost, which yeah, thats alot. I'm soon to be in the military(US ARMY- MOS 11B) and me and my wife are thinking about getting matching trucks. Volume production is expected to keep the price reasonable. Members Profile. As the product becomes accepted, weight reductions are scheduled as regular product upgrades, as justified with actual race testing. 2 0. … The KB T6 hypereutectics are considerably different than the forgings. Details about Speed-Pro Hypereutectic Pistons. It is often heavier since the manufacturer has to increase wall thickness in order to achieve sufficient strength. Original equipment design is almost never suitable for performance applications. What we find is that the majority of the current cast pistons that are being fitted to performance factory engines are generally quite close to the eutectic point. This means that it expands less than a piston with no silicon, but since the silicon is fully alloyed on a molecular level (eutectic), the alloy is less brittle and more flexible than a stock hypereutectic “smog” piston. Home | Phone: 309-745-9558 | Email: information@hughesengines.com. design hypereutectic pistons for high performance. Dome Piston Design and Manufacture of a Dome Shaped Piston Head April 10, 2015 A hypereutectic piston is an internal combustion engine piston cast using a hypereutectic alloy–that is, a metallic alloy which has a composition beyond the eutectic point. When auto enthusiasts want to increase the power of the engine they may add some type of forced induction. At a blend of 25% silicon there is a significant reduction of strength in the piston alloy so stock hypereutectic pistons commonly use a level of silicon between 16% and 19%. Translate Topic. AMC Apprentice Joined: Nov/17/2007 Post Reply. If you're looking for pistons with an unbeatable combination of performance and value, then Speed-Pro hypereutectic pistons are for you. SPEED PRO Hypereutectic .340" (30cc) Dome Pistons+moly Rings Kit compatible with Chevy 7.4L 454+30 (4.280" bore). Prev. We will EXCEED or MEET any advertised price on AFR heads! This makes them structurally more durable. Hypereutectic pistons allow for far tighter bore clearances which are more supportive of low tension rings. These pistons can survive mild detonation with less damage than stock pistons. Please speak on Price, Size of interior, Customization, Duration and what the Pros and Cons … Mr. Ellas . With this in mind, we caution the reader about the use of non-T6 heat treated O.E. Performance replacement alloys. The pistons are Speed Pro Hypereutectic. 4.4 out of 5 stars 2. Hypereutectic 390 refers to a unique aluminum piston alloy that contains dissolved and free silicon. It is often heavier since the manufacturer has to increase wall thickness in order to achieve sufficient strength. Speed-Pro Hypereutectic Pistons. This also makes them more affordable. A rigid piston rocks less in the cylinder and improves ring seal. I forget what cam, but better than the original Hypo cam. Condition: New. Many customers have asked if it's okay to reuse their pistons. I have been doing some research as to what parts to get for my up coming project. Only 1 left in stock - order soon. Small runs of forgings are more economical than small runs of permanent mold pistons because of the complexity of permanent mold tooling. The heat expansion cannot be controlled and is therefore often not completely round since the piston pin requires some material on the inside. Although internal combustion engine pistons commonly contain trace amounts (less than 2% each) of copper, manganese, and nickel, the major element in automotive pistons is aluminum due to its light weight, low cost, and acceptable strength. The KB pistons have shown improvement in power, fuel economy, cylinder sealing, service life, and cost effectiveness. Follow. Silvolite and others do make replacement-type hypereutectic pistons that are worthwhile for stock replacement applications. For pistons used in competition applications, this isn’t a major consideration since they will be replaced in the search for ultimate power long before significant wear is introduced. It is cheap. No high performance useage, just a stock cruiser. The choice between using a Cast, Hypereutectic or Forged piston is dictated by the application. Where quantities justify, expect to see future KB pistons developed that are lighter and stronger than anything else on the market. The 2618 performance piston alloy has less than 2% silicon. Speed-Pro manufactures a wide range of Hypereutectic and Powerforged pistons, main bearings, piston rings, rod bearings, wrist pin bushings, timing chains, valves, valve springs, and retainers. Piston heads can range from perfectly flat tops to dished pistons with a depression in the middle and their polar-opposite domed equivalents; each design has pros and cons that are heavily dependent upon other factors, like cylinder head design. A standard cast aluminum piston has around 8-to-10 percent silicone content, which improves the hardness and helps reduce wear around the ring grooves, skirt and pin boss. Pistons are broadly categorized into three main groups, namely cast pistons, hypereutectic pistons and forged pistons. The piston will be weaker in structure. The use of forged pistons by racing tuners and mechanics is evidence of this particular piston's capability. I just need to read up on pros and cons of different subjects like Rod lengths, compression ratios, RPM ranges, etc. This allows you to rebuild your engine and other areas of your vehicle with upgrades to gain that max torque and power. The forged piston requires thick skirts to achieve comparable piston rigidity. Chev SB, Chev BB, Ford SB Hypereutectic Pistons, Speed Pro Hypereutectic Pistons, KB (Silv-O-Lite) Claimer Pistons, KB Performace Hypereutectic Pistons Reasonable pricing is just an added benefit. Machined head profiles are easily changed with our CNC equipment so we will stay current with new cylinder head developments. The KB line of hypereutectic pistons were designed around the 390 alloy. First of all before everyone goes crazy here let me describe the application. This is a stock non-modified motor in a 84 Turbo GT. If the piston is to be used as a stock replacement, more than a 10% weight reduction will mandate that the engine be re-balanced. Overhauling An Aircraft Engine - Cylinders, Valves & Pistons (1945) US Office of Education part 2/2. Reply. Find Members Posts. More HP and greater longevity of the reciprocating assemblies.. Today’s pistons cannot be compared to what we knew 20 years ago. They are also produced in bulk with most manufacturers only producing sizes that are close to factory specifications. The reduced thermal expansion rate allows the piston to be run with reduced clearance, which reduces losses due to gases escaping past the sealing rings. Hypereutectic 390 refers to a unique aluminum piston alloy that contains dissolved and free silicon. Now, with focus on peak cylinder pressure timing, ring sealing dynamics, cylinder air tumble and swirl, combustion chamber science, and extended RPM ranges, we need to consider some new piston options. The design flexibility enjoyed by the KB series of pistons has an advantage over present day forging practices. The result is a much stronger material. This limitation makes it difficult to make a light weight piston without sacrificing strength. Price: US $200.00. Forged pistons are well known in the racing and performance industry because of their ability to withstand more heat, higher RPMs, higher boost and higher temperatures. This means running the stock 8-10PSI. The close fit of the KB piston allows the piston rings to truly seal, minimizing blow-by. Stock engine pistons just could not handle the pressure. I asked about Silvo Lite's "390 Aluminum" they say they use in their hypereutectic pistons. A rocking piston wears rings and increases blow-bye. Silicon in this context can be thought of as “powdered sand”. Pros and Cons of Cast Pistons, Forged Pistons: Post Reply : Page 1 2 3 > Author: Message Topic Search Topic Options. so i wanted to kno the pros and cons of hypereutectic pistons compared to the other forged pistons that come in foxbodys . Hypereutectic pistons are more brittle and subject to failure when exposed to preignition. The die for a forged piston must be designed so it can be easily removed. I called him and he will exchange the cast rings for moly rings and said it should not effect the balance job. Another advantage to a forged piston is that they can be individually made to any custom size or specification without the high cost of casting. Im doing my own research but opinions from people can help make my decision. 07 GT/CS manual - STOCK 88 LX automatic-SOLD 01 GT manual-UNDER CONSTRUCTION 97 GT automatic-SOLD. $294.69 $ 294. Hyper's are a compromise. The forged pistons' thick skirts add weight. Flat top hypereutectic pistons. This alloy is capable of experiencing the most detonation and abuse while suffering the least amount of damage. Forged pistons are always considered an upgrade to cast and hypereutectic pistons. However, the minor additional cost of a forged piston can save your motor from disaster in a marginal situation. Jump to Latest Follow 41 - 58 of 58 Posts. Speed Pro performance cam. But forged pistons are not just for professional racers. A cast shaped component signifies that the material being used has been first melted and then poured into a specific mold to shape the piston. Ford 385 Series Engine Builder's Forum (370, 429, 460) Founded October 25, 2000 > The advantages are many, for example: a possibility to add other components like silicone, carbon, zinc and so on in order to gain certain properties. Piston design has long been a point of contention among hot-rodders, and for good reason. Some current KB pistons are not super light for several reasons. Speed Pro Hypereutectic Pistons at Competition Products! Aftermarket performance pistons are most commonly made from 4032 and 2618 alloys and are typically forged. Any recommendaions on resources? Be the first to write a review. The KB pistons' utilization of the permanent mold with multiple die parts allows undercut areas above the pin hole and material distribution in the skirt area that stiffen the entire piston unit. (Reprinted from KB-Silvolite website http://www.kb-silvolite.com) Crankshaft Tech – “SAY NO TO CROSS – DRILLING”, Bessel Motorsports Announces the Industry – Exclusive BBS System. A cast shaped component means that the material has been melted and then poured into a mold that basically shapes the piston. Item Information. And contrary to popular belief, hypereutectic pistons where we've got more than 12% silicon content aren't specifically any stronger than a eutectic piston. Add to Buddy List. Hypereutectic pistons are used in some original equipment engines. 69. Cast pistons. There are disadvantages also, of course. 1967 C5AE block. Printable Version. Forged pistons are mechanically shaped into a piston shape. Forgings have long been the mainstay of the performance business and did well in the big cubic inch engines of the 60’s. Common sense suggests that the introduction of a new product be extra strong at the initial release. Non-heat treated 390 hypereutectic alloy aluminum has slightly less strength than conventionally cast F-132 aluminum. Forged produces a finer grain structure and is subject to fewer manufacturing defects. 1966 COAE-M 289 heads that were ported/polished/decked, valve job, screw in studs, GT40 valves 184 Intake/154 exhaust all new springs, valves, etc. There are disadvantages also, of course. These are known as hypereutectic pistons and their chief advantage is a very low expansion rate. They can be installed with as little as 0.0005-inch piston-to-wall clearance on the major diameter. Hypereutectic -vs- Forged Pistons. I need your opinions on the pros and cons of using hypereutectic pistons in a turbo motor. The result is a high performance part intended to give the performance engine builder access to the latest in piston technology. There will always be a market for custom forged pistons. okay, so ive done a search on titanium pistons, and came up with nothing. The material can be T6 heat treated to high strength and stiffness. The word eutectic refers to a condition in chemistry when two elements can be alloyed together on a molecular level, but only up to a specific percentage, at which point any additional secondary element will retain a distinct separate form. FREE Shipping. So the extra expense might mean early engine failure. “Hypereutectic” means over eutectic. By compressing more air and fuel into each intake cycle, the power of the engine can be dramatically increased. I have a couple of stock bore blocks that are a tad … The alloying element of concern in automotive pistons is silicon. Create New Topic. The material can be T6 heat treated to high strength and stiffness. The reduced thermal expansion rate allows the piston to be run with reduced clearance. They are hammered, pressed (forged) into a mold forming the piston in turn removing any possible porosity and also pushes the alloy grains together tighter than can be achieved by simple casting alone. Bored 30 over, Stroked with 1968/1969 302 3 bolt crank shaft. They are favored because of reduced scuffing, improved power, fuel economy and emissions. IN YOUR HONEST OPINION WHICH TRUCK IS A BETTER PERFORMER. 2618 Alloy Pros and Cons. Hypereutectic pistons are made of an aluminum alloy which has much more silicon present than is soluble in aluminum at the operating temperature.Hypereutectic aluminum has a lower coefficient of … The aluminum itself doesn’t build up inner tension as much. Speed Pro Hypereutectic Coated Pistons (8) H860CP +.030" moly rings compatible with Chevy 350 383. These casting people I spoke with had never heard of anything called 390 aluminum. Find Speed-Pro Hypereutectic Pistons and get Free Shipping on Orders Over $99 at Summit Racing! The density of the material doesn’t increase which means it could be kept light. Save Share. 11 years ago | 634 views. They are favored because of reduced scuffing, improved power, fuel economy and emissions. Aftermarket engine pistons can help minimize wear and tear under these straining conditions by design modifications and special coatings that help reduce friction. millcylinder. Hypereutectic pistons are actually favored because of reduced scuffing, improved power, and fuel economy. Cast pistons don't expand with heat as much as forged pistons do, so cast pistons can use tighter piston to cylinder wall clearances. They were familiar with T6 heat treatiung however, and felt that the secret was probably in that rather than the unknown 390 alloy. By utilizing state-of-the-art CNC machines, most manufacturers can maintain exact specifications and tolerances. They inherently have metallurgical characteristics that differ from their cast counter parts. The piston will be weaker in structure. This also increases the heat and pressure in the cylinder. Hypereutectic pistons are stronger than more common cast aluminum pistons and used in many high performance applications. Send Private Message. The design of KB pistons gives us the option to build the lightest pistons on the market. A question on terminology; My old advisor had a 350 that preformed well by the seat-of-your-pants dyno, and he always talked that he liked to build a "tight" motor and explained it as when throttled it was … Forged pistons may not be absolutely necessary in all applications. Hypereutectic pistons are used in some original equipment engines. Traditional cast pistons are considered good enough by most engine tuners and builders when it comes to stock setups, and suffer no drawback in terms of … Browse more videos. I also had him balance the setup. 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Gt manual-UNDER CONSTRUCTION 97 GT automatic-SOLD as much upgrades, as i was reading the `` State of 60... €¦ forged pistons, hypereutectic or forged piston is less likely to rock, make noise, superior! Manufacturer has to increase wall thickness in order to achieve comparable piston rigidity..... Kb Performace hypereutectic pistons are mechanically shaped into a piston shape in bulk with most manufacturers only producing that! A couple of stock bore blocks that are lighter and stronger than anything else the. Producin… hypereutectic pistons are used in some original equipment engines up on pros and cons of hypereutectic are. Silicon in this context can be T6 heat treatiung however, and cooling techniques are required obtain. Part intended to give the performance engine builder access to the Latest piston! With 1968/1969 302 3 bolt crank shaft are used in some original equipment design is almost never for... Help minimize wear and tear under these straining conditions by design modifications and special coatings that help friction...