Im debating on which piston to go with in my turbo engine. The ITM are hypereutectic from what I understand. Not sure if thats good or bad for a boosted engine. The other choice is Ross forged pistons.
The engine will be a street/track motor making 300-350whp.
What are the pros and cons of each?
Forged, for sure. Hypereutectics tend to explode if there is even moderate detonation.
Hypereutectic is better than cast for an na motot but has no place in a boosted motor, when your upgrading pistons that is. Forged all the way
Heh, Toyota put hypereutectic pistons in the 4AGZE (vs. cast in other 4AG variants).
What about adding a ceramic coat to the top of the piston?
Ceramic coatings have been proven to improve piston durability
In reply to NickD:
Thats what I had read but Im always skeptical of claims like that. Do you have a link or anything? I love reading up on the engineering of parts.
There is a lot more to it than just hypereutectic or forged. Generally, hypereutectic pistons are weaker but forged wear faster due to the looser tollerances required. They are both a compromise. But- there are some strong hypereutectic pistons out there. Design is important, ring land size, spacing, etc.. 4G63's used them all all the way up to the EVO 9. 200hp per liter isn't very weak, and I've seen lots making that power that have 200,000 miles on them- it would be very hard to get a forged piston motor to last that long. On the forged side, there are multiple options, all with their own strength Vs. longevity trade offs. Different alloys have different properties. The most common are 4032 and 2618 alloys. The 4032 expand less and can be used with tighter tollerances, but aren't as strong. The 2618's are stronger, but will wear faster. I used 4032's in my Subaru engine build. I'm not building a race motor, but the factory pistons are a know weak point (my stock car cracked the ring lands on two.) for me the 4032's were the best compromise.
That said- ring gaps have a huge role in piston life. I think Subaru's problem was more of the too small ring gaps than just weak pistons.
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