just curious if my snake came with hypereutectic pistons. i seem to be getting mixed answers from elsewhere, sources appreciated.
Hypereutectic Piston
- Thread starter XtremeAceX
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the Hypereutectic ones are the forged aluminum/silicone alloy ones, generally with the teflon pads on the major and minor thrust sides to reduce friction from the connecting rod geometry.. any idea if these are the ones that are used? or just forged pistons?
Forged Zollner pistons, not that "crappy". Unless you're planning on having an all out drag car, the stockers are plenty strong. :rockon:
lol word, but less parasitic load on the engine = more power = more fun :burnout:
Precisely, the stockers are heavy slugs but plenty strong... thats the only negative aspect i can come up with. Less weight is always a plus on these beefy ponys.
They were used on all of the N/A 4V engines. The S/C 2003/2004 went forged.
Don't forget about tight PTW (piston to wall) tolerances. I consider that a big negative, especially if you have any thoughts about a top end run.
03 and 04 cobras have forged pistons, not hypereutectic. prior year cobras have the hypereutectic pistons. Forged pistons in the 03-04 cobras are great for high power applications. Hypereutectic pistons should be limited to around 425 rwhp.
the hypereutectics are forged, rather than cast, of a silicone/aluminum alloy. at least the ones that i have had experience with as far as i know ..
and from what i was told, my dad used the hypereutectics in his drag car with about 925hp to the wheels, so im not sure about the limitations on them
and from what i was told, my dad used the hypereutectics in his drag car with about 925hp to the wheels, so im not sure about the limitations on them
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^^^ i don't know where you heard that, better talk to Dad. Yea Forged zollner pistons 4032 alloy what we have stock w anti friction skirts. They are setup tight but give them a few 1000's mi they will do better imo. A normal 4" bore is set around 3 to 4 thousands w forged pistons. a hyper or cast is set sround 1.5 thousands. Reason is a lot of cast have a steel insert. But they are brittle, I broke several skirts on a 428 w over rev. Usually I don't quote this but it explains easier than I want to.
http://en.wikipedia.org/wiki/Hypereutectic_piston
http://en.wikipedia.org/wiki/Hypereutectic_piston
Someone correct me if I'm wrong, but I thought that one of the best benefits of hypereutectic pistons was that they had a better "self-lubricating" property that made them preferred for high piston speed applications such as stroker motors? I've always heard that hypereutectic pistons are only recommended in a NA motor.
If what I have always heard is correct, then we should have forged pistons in the Cobras.
If what I have always heard is correct, then we should have forged pistons in the Cobras.
Hypers are better for that person that starts their car and takes off within a few sec. Im not at all saying its a good thing.
With forged pistons you gotta let them warm up for quite a few minutes.If you just take off and get on the throttle too much when its cold your asking for trouble.
With forged pistons you gotta let them warm up for quite a few minutes.If you just take off and get on the throttle too much when its cold your asking for trouble.
omg, this thread is full of just the dumbest shit I've seen in a long time.
01cobravortech
Banned
If you're doing top end runs to begin with, then you get what you deserve.
:lol:
I would say our stock pistons are ANYTHING but crappy. We got a hell of a stout motor in these cars. How many 600+rwhp 03/04's are roaming the streets on stock internal?????
The difference is in the thermal expansion properties. Hypercrapola pistins expand very little between cold and hot vs Forged pistons. Ford used them because cold, they sealed very well so emissions and fuel economy was more consistent from a cold start to operating temperature.
The main problem with them is that they are more brittle and so dislike detonation much more so than forged pistons do. With a supercharger, they are more prone to breaking a skirt, and since Ford was interested in keeping the stock 03-04 engine together for at least 36,000 miles, they went forged. But not the best pistons and connecting rods, just good enough to last longer than the warranty. After all, Quality is job 1, but Cost is job 0.95.
Killer, thanks everyone who able to help me out in gathering the information I was lookin for.
And thanks Snakebit, you definately seem to know what your talking about.
And thanks Snakebit, you definately seem to know what your talking about.
To be fair, it should be noted that the 2 major problems with stock Terminator pistons are:
1) Very shallow compression ring, high up on the piston, creating a thin piston land, prone to breakage. This is done 100% for emissions reasons, as a deeper ring and land leaves more dead space which traps air/fuel that doesn't get ignited.
2) The tight piston/cylinder clearance, which has been explained several ways, including preventing piston slap when cold and limiting blowby for emissions reasons.
I think it is unfair to say that Ford put in marginal pistons. They are appropriate for stock and even heavily modified motors. I am certain that the vast majority of piston failures are because of tuning or A/F problems on modified cars. If you're going to extreme twin screw levels of boost or playing near the edge with tuning, you should expect to install sturdier pistons if you don't want to experience a failure- just like on any other production engine.
1) Very shallow compression ring, high up on the piston, creating a thin piston land, prone to breakage. This is done 100% for emissions reasons, as a deeper ring and land leaves more dead space which traps air/fuel that doesn't get ignited.
2) The tight piston/cylinder clearance, which has been explained several ways, including preventing piston slap when cold and limiting blowby for emissions reasons.
I think it is unfair to say that Ford put in marginal pistons. They are appropriate for stock and even heavily modified motors. I am certain that the vast majority of piston failures are because of tuning or A/F problems on modified cars. If you're going to extreme twin screw levels of boost or playing near the edge with tuning, you should expect to install sturdier pistons if you don't want to experience a failure- just like on any other production engine.
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