Pistons designed for forced induction will typically feature a thicker piston deck area. Some racers are using hypereutectic pistons successfully … Warning! UEM manufactures the Silv-O-Lite OE aftermarket piston line, KB Performance Pistons (including the motorcycle division), and The Claimer Performance Piston Series. Originally, there were some forged piston part numbers in the KB line, but all forged pistons have been moved to the new Icon line up. Reactions: Noobz347. They can be installed with as little as 0.0005-inch piston-to-wall clearance on the major diameter. Hypereutectics work just fine till something goes wrong like a … Or worse.. Re: Summit Racing Speed-Pro Hypereutectic Pistons? I have also seen people spraying 94-95GT’s with 150 shot’s with no problem and I have also seen 94-95GT’s with S-trim blowers with no problems. Aug 18, 2017 1,301 602 143 51 Connecticut . I will be using a kit with Hypereutectic Pistons, and a set of aluminum heads that will give me 9.3:1 C/R and I want to run about 8-10 PSI from the turbo with Water/Meth injection. These, known as hypereutectic pistons, have additional silicon added to the alloy that raises it to a 16-18 percent level in the mixture. May 17, 2018 1,969 1,400 123 40 Enterprise AL. For a stock style bottom end they are OK. Don't risk your high performance engine with a set of cheap pistons. Compression ratio. Call 800.979.0122, 7am-10pm, everyday. Free Shipping; $191.99. Hypereutectic pistons are more difficult to cast because the silicon does not always disperse itself evenly throughout the aluminum as it cools. The hypereutectic pistons can handle boost and Nitrous. Keith Black Pistons in-stock with same-day shipping. I've never broken them except while working my way up a fairly steep learning curve with my last few supercharged engines. Tweet; Nitrous gets a rap for being hard on parts, but with the right engineering, a nitrous engine can be a tough, long-lasting performer. My 2 cents . It is the primary silicon that gives the hypereutectic it’s thermal and wear characteristics. When compared to traditional cast pistons, which are not designed for performance use, the Hypereutectic’s are significatly stronger, particularly in the highly loaded ring land, skirt and pin bore areas. … Head Sealing. IMG_2304.JPG Shared with Dropbox. It may go. Some of these pistons are heat treated for additional strength. In addition to greater strength, scuff, and seizure resistance, the hypereutectic will improve groove wear and resist cracking in the crown area where operating temperatures are severe. KB pistons make more HP by reflecting heat energy back into the combustion process and, as a result, the top ring runs hotter and requires additional end clearance. These are known as hypereutectic pistons and their chief advantage is a very low expansion rate. I know a few people have boosted over 12psi on stock cast aluminum so i assume they should be good if i get a good tune but thought i would ask. Higher octane fuel will allow you to run higher boost levels, approximately 1 psi for every 2 points of octane. Learn what it takes to create a piston optimized to survive and thrive on the bottle. Aftermarket hypereutectic performance pistons are available for upgrading a wide variety of engines including SB/BB Chevys and Fords, as well as many late model engines and sport compact engines. Pistons, Hypereutectic, Flat, 4.000 in. Hypereutectic pistons are typically assembled with closer-to-cast piston clearences, where a forged piston is typically put together with much looser clearence IN RACING APPLICATIONS. Bore, 5/64 in., 5/64 in., 3/16 in. P. pmuller9 2K+ VIP Member. I recommend the use of hypereutectic pistons on a boosted street driven engine. The mfr. Not Yet Reviewed. To do so, you can either machine these through the main journals like certain factory oil squirters are or install an aftermarket squirter kit. Unlike forged pistons where you will get piston slap when starting a cold motor because of the thermal expansion The term 'hypereutectic … Hypereutectic pistons are actually favored because of reduced scuffing, improved power, and fuel economy. Not everyone can afford $400 for a set of pistons. I do plan on installing a five speed or Gear Vendors OD unit, but that's another chapter. Many factory turbo cars have a compression ratio of between 8.5:1 and 9:1, but 8:1 is a safer ratio for 20+ psi boost applications. Hypereutectic pistons push the level of silicone beyond the amount that can be alloyed into the metal, and that's where the funny name comes from: hyper, meaning above or … Answer Save. March 9, 2018 / by Paul Huizenga. 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. The tech guy I spoke with said a hypereutectic piston would be good for at least 500 HP and is a better piston for a street motor that won't see much more than 6000 RPM. Get at least the 4032 forged pistons. Got the DOHC block checked out and it is good to go .040 over I plan on boosting around 8-10 daily and around 13-15 at the track but am wondering how the hyper pistons hold up to boost. Ring Grooves, Chevy, Set of 8. Small-block pistons are forged from 4032 alloy, with big-block, nitrous and boost application pistons produced from 2618 aluminum for additional strength. One good rule of thumb is to drop compression by about one point for every 15 pounds of boost. Lowering compression ratio will decrease engine horsepower off boost, but it will allow you to safely increase your boost settings for more top-end power. Relevance . Increasing ring end gap does not affect performance or oil control because normal end gaps are realized at operating temperatures. 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. Favorite Answer. Are hypereutectic pistons in a 350 Chevy Crate Engine strong enough to handle 5 to 7 LBS of supercharger boost. to expansion & contraction. United Engine and Machine Company is now enjoying more than 98 years in business. Shop Keith Black Pistons and get Free Shipping on orders over $99 at Speedway Motors, the Racing and Rodding Specialists. Mar 4, 2020 #4 Very informative. Hypereutectic pistons are suseptable . V. vdubn ... 2018. Part Number: UEM-9902HC-STD. I am wanting to build a single turbo Chevy 383 stroker. Hypereutectic pistons have silicon content above 12%. Olivethefet Slap me as well as point and laugh. Keith Black hypereutectic pistons are designed to position the top ring very close to the top of the piston. Hypereutectic Keith Black Pistons with Low Boost Supercharger. Pro Tru pistons are made with the same features as the company's conventional forged piston; however, Wiseco includes a high-quality plasma moly ring set. Thomson suggested placing an oil squirter on the pistons, as the LS3 has siamese bores that don’t pull any heat out of the pistons and can become a real problem when you begin to put boost to the engine. Our Hypereutectic pistons operate perfectly with standard ring end gaps, and have conventional ring land locations. My point is more then forged vs. hyper needs to be addressed. In many instances, the OEM hypereutectic pistons can handle engine modifications that boost power up to 30 percent or more over stock. Thanksgiving dinner at the Power Adder family table is always awkward. 5 Answers. I broke a hypereutectic piston (ok, it was with 8 psi of boost) and wouldn't put them back in a high performance engine. of a racing forged piston doesn't have 100K miles on … The T-6 heat treatment often used on performance pistons will increase strength by as much as 30 percent. These pistons are manufactured from aluminum alloy that contains 16 percent silicon for greater strength and wear resistance. Does anybody have any experience with running hypereutectic pistons in a turbocharged engine (I'll be running about 15-18 psi max), or know if the pistons will hold up? Boost Vs. Juice: Designing A Piston For Nitrous Oxide. RedCavalac wrote: Not everyone can afford $400 for a set of pistons. High compression pistons also increase the detonation potential, which makes engine compression the primary limiting factor where boost is concerned. I think Ford stopped using hypereutectic pistons during the Fox Body run. Such as the Sealed Power H5199-P 020. Cheaper and much less possibility of knocking the ring lands out. Hypereutectic pistons are made of an aluminum alloy which has much more silicon present than is soluble in aluminum at the operating temperature. Supporter 2018. Chris Delano . … Emphasis added as 5.0 Ford/forged OEM pistons fly in the face of that argument. tony; Yes they should. The piston is still made by the casting process but by increasing the silicon content it gives us a stronger part which also has better thermal efficiencies to handle higher power levels. I have a freshly rebuilt stock bottom end 302, running Edelbrock aluminum heads, with Keith Black Hypereutectic pistons that net about 10.5:1 compression. The KB hypereutectic pistons offer a great compromise of high performance with reasonable prices. At $18 each you cant go wrong. Pistons. The use of quality forged or billet pistons is highly recommended. Find Speed-Pro Hypereutectic Pistons and get Free Shipping on Orders Over $99 at Summit Racing! Today at 4:02 PM #3 The stock EFI head has a combustion chamber volume of 68-69cc The new aftermarket EQ replacement head I posted measured closer to 65-66cc last time we measured one. If you're looking for pistons with an unbeatable combination of performance and value, then Speed-Pro hypereutectic pistons are for you. They are quieter and last longer, just like the Car Craft article says. For pump gas (91-93 octane) applications, a compression ratio of 8.5:1 to 9:1 is recommended for boost levels of 8-10 psi. Jump to Latest Follow 1 - 7 of 7 Posts. engine: 93 block (3.661" bore) stock crank stock connecting rods In addition to KB Hypereutectic pistons, UEM now offers a line of forged pistons also which are marketed under the brand name of Icon. Estimated Ship Date: Monday 2/8/2021 if shipped by air. For mild amounts of n2o and boost they should be perfect. Not that that is saying much.... Steel1 Mustang Master. 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. This video shows information regarding Piston ring end gap on Hypereutectic pistons. The major difference between a naturally aspirated engine and a nitrous or blower motor is cylinder pressure and operating temperatures, so it’s important to design a piston accordingly. Wednesday, December 05, 2007 8:10 PM. Re: Summit Racing Speed-Pro Hypereutectic Pistons? Thanks. Estimated Ship Date: Monday 2/8/2021 if shipped by air. Mar 5, 2020 #5 Interesting watch. My experience with KB or any other hyperutectic piston has not been that great. This applies more heat into the ring, which requires a larger top-ring clearance compared to other pistons of the same size. on a build like that, very very mild no boost or nitrous, I'd just as soon toss in a set of sealed power cast pistons. COVID-19 Update: We are OPEN, shipping daily! Even though forged pistons are remarkably stout, power adder applications call for extra-rugged pistons designed specifically for boost and nitrous. Depending on the amount of boost and resulting cylinder pressure, OE cast or hypereutectic pistons may not be able to handle the increased temperatures and cylinder pressure. This is for a positive displacement application. I learned something. I also plan on coating the tops of the pistons … Problem is Ring Land problems with supercharged … Cast and hypereutectic pistons can be used but should be limited to lower horsepower (approx 450-500 hp) applications. 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. They (the hypereutectic ones) don't hold up well to the kind of vicious detonation that can happen in a nitroused or boosted application, but I've run quite a few sets of them in many motors successfully. Guillaume Charest 1995 DGGM Caprice, 355ci twin turbo, TH400, F.A.S.T. bill d. 1 decade ago. Products to Compare (max of 3) X. Customer Service Since 1952 in All... All Street Race Truck in Search. And the 4:30 gear, you're right. xdclevo. However, keep in mind that dropping compression too far will reduce engine power when off of boost, increasing turbo lag and decreasing driveability. 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. The Toolbox Cart. Track Order. 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