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Old 11-07-2009, 01:40 AM
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Hypereutectic vs. forged pistons?

Hello im new to this site and i like it so far. Very good and understandable answers. I was reading the q/a's on pistons. My question is the same as all the others but people are asking about the street/strip. What about off road and street? we drive my 77 Blazer all around town and drive the heck out of it in the mud on the weekends. Would it be beneficial for the forged since it is hard driven on the weekends? Or the eutectic because it is not a constant load every day?
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Old 11-07-2009, 02:35 AM
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Hyper pistons are pretty stout and will live providing you keep the engine out of detonation. Forged pistons are one in the same, only they last a little longer under detonation. I`ve used the speed pro hyper coated skirt pistons in several successful builds and one of those builds is a daily driven street vehicle that gets raced on the weekends. However mudding is completely different than drag racing and since we used to mud race as well as mud ride I know the conditions engines run into like super thick mud that lugs the engine down so in that case I would use forged pistons.
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Old 11-07-2009, 05:19 AM
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Unless you're going to race, save your money and buy the hyper pistons...
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Old 11-07-2009, 06:17 AM
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Agree with DoubleVision, if you are going to lug it into the mud very much get the Forged pistons. Mud is a pretty hard enviroment for the engine to work in.
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Old 11-07-2009, 09:27 AM
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hyp in my opinion. They'll take a lot of abuse.
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Old 11-07-2009, 11:12 PM
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Hi there, welcome to the site! I suggest you read this thread I posted a while ago after my engine exploded, LITERALLY! Blow-by 383 rings not seated? (video inside) . Now a big part of that was likely my fault but I would not suggest using KB hypers after what I experienced. Every single person I have talked to about these pistons says they are the absolute worst pistons you could buy.
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Old 11-08-2009, 03:07 AM
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There`s no reason why a hyper piston like a speed pro wouldn`t work. I`m only saying since I`ve had experience playing in the mud there`s a lot of variations to think of, it takes power to drive the whole system from transmission to transfer case to gears and tall mud tires then lastly you factor in how much mud the tires must move to put the vehicle in motion. Mud`s flying everywhere and getting all over everything so in turn the engine runs hotter as there isn`t as much air flow plus the mud on the engine makes it run hotter as it makes it act kind of like a blanket. Sometimes you hit a hole that`s got the really thick suction mud and it lugs the engine down. One of the worst things you can do to a engine is lug it, and sometimes in the mud it can`t help but happen and when a engine is lugged that`s when detonation will set in and since detonation alone is bad enough when the engine is lugging it`s X2 worse. But we have broken hyper pistons since sometimes in the mud high RPM`s have to be used for long periods of time. That`s the biggest reason I recommend forged pistons, since in mud, every type of condition the engine must endure is there.
If you use hyper pistons then make sure the piston to bore tolerence is correct, set the Quench distance from .040 to .045, jet the carb one step richer, run spiral core spark plug wires and route them correctly and keep them away from each other, run a 180 degree thermostat with one 3/16 hole drilled in the outer paremeter, use high octane fuel, carefully set the spark timing, plumb cold air induction to the carb, and most importantly, keep the compression ratio around 9.5:1. All these steps help keep the detonation monster at bay.
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Old 11-09-2009, 06:33 AM
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Quote:
Originally Posted by sexypizzaman
Hi there, welcome to the site! I suggest you read this thread I posted a while ago after my engine exploded, LITERALLY! Blow-by 383 rings not seated? (video inside) . Now a big part of that was likely my fault but I would not suggest using KB hypers after what I experienced. Every single person I have talked to about these pistons says they are the absolute worst pistons you could buy.

I've used a few sets of KB's and was actaully impressed by them for their price. They cannot be ran like any other piston though and that has to be taken into account or you will run into detonation.
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