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Forged probe pistons will probably come in some 100 grams per piston less than the cast. Pinterest. 302 Hypereutectic vs. No, they're all hypereutectic. 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. The short version is: it has almost nothing to do with the strength of the piston. I am aware that cast pistons are eutectic, but from what I recall Hypereutectic is a different form of treatment resulting in a harder surface structure (however if I recall more brittle) It appears that a T-6 treatment is commonly used as annealing (if this is the correct terminology) to reduce the brittleness. KB has an excellent article on their website about hypers vs. forged that your should read so you understand WHY. Aftermarket performance pistons made from the most common 4032 and 2618 alloys are typically forged. Once you have too much heat in the top of the piston bad things happen, including top ring and ringland damage (the #1 cause of hypereutectic piston failure). Toyotas generally run rich everywhere as a precation against detonation. Which will make life easier on the rods, crank, bearings, etc. KB Pistons can be installed tighter than other performance pistons. Both Cast and Hyper-Eutectic pistons offer weight saving advantages over (most) forged pistons as forged pistons require a larger collar for structural rigidity (Conflicting information here more research required) I've read many negative comments about Hypereutectic pistons and the problem was caused by NOT following directions for the proper ring end gap. Assuming they are designed for boost (flat top, thicker upper land, heavy pin bosses, etc..), they'll do just as well if not better than a stock 4G63 cast piston. Re: Pistons - Cast vs Forged vs Hypereutectic I think when they say that, they are talking about 11:1 when tuned to within an inch of it's life. I get the impression that a lot of advances have been made in cast piston alloys - to the point where KB claims the hypers are MORE heat resistant than the

47. Go to the KB site and read their articles. Yes I must state that I was am looking for Stu's input here. Do you think either brand others a distinct advantage or disadvantage, in terms of reliabilty and performance. No, they're all hypereutectic. I have been looking for info on these on the internet but there's nothing on the forged pistons. Forged have their place too if the motor is going to be hammered, will experience detonation and or overheating a lot. The difference has more to do with how they manage the heat of combustion. That equates to taking one entire piston and pin out of the engine, weight wise.

KB makes both coated and un-coated. Go to the KB site and read their articles. I can see you have never installed KB Pistons in an Engine.

FORGED vs CAST vs HYPEREUTECTIC PISTONS. Lucky667 Compared to both 4032 and 2618 alloy forged pistons, hypereutectic pistons are significantly less strong. The hypereutectic pistons have some bad reports of going ka boom … In this video we are going to dive deep into the differences between forged pistons, cast pistons and hypereutectic pistons. We are going to look at the facts, see how forged and cast pistons are made, what makes them different, what are their advantages and disadvantages and then we are going to make an informed decision on … They can be installed with as little as 0.0005-inch piston-to-wall clearance on the major diameter. They are not as strong as forged pistons… In most cases forged are also the only option for limited run pistons, special applications, such as bore / stroke / piston domes. This applies more heat into the ring, which requires a larger top-ring clearance compared to other pistons of the same size. I personally have seen a set of hypers in a stock 5.0 handle a 125 dry shot of nitrous for about 5 years without breaking a sweat. Post: Hypereutectic -vs- Forged pistons (Topic#224135) NYH1 Contributor Posts: 735 Loc: Central New Yorkistan Reg: 07-15-09. In this video we are going to dive deep into the differences between forged pistons, cast pistons and hypereutectic pistons. User Info. Hi all Anyone used the KB forged 4032 alloy pistons.

Hi All, What are your thoughts on Speed Pro vs KB hypereutectic pistons for street performance use, say up to around 450 to 475 hp range. Nothing wrong with current issue KB or SE cast pistons. Pistons are broadly categorized into three main groups, namely cast pistons, hypereutectic pistons and forged pistons. Hypereutectic pistons are still cast pistons, and they will not tolerate the abuse that a forged piston will.