Difference Between 2618 and 4032 Forged Pistons 

Silicon....not silicone...rrally good explanation

Good explanation. Most of what I use is 4032. Because of street car and and occasionally bracket race. And mild power adders. I prefer to use it because you can usually run .001/.0015 tighter piston to wall tighter than 2618. Most of these engines are built for more longevity. However higher compression and higher horsepower applications almost require the 2618 material. Great subject and content. Take care, Ed.

Thanks for the info coverage! I recently acquired a set of summit 2618 pistons for a drift motor build & have started to do research on the different metals for valves/pistons/rods/etc! Hoping I made a good choice but seems like they’ll serve the intended purpose for now after seeing this!

Great explanation very precise and to the point.

This was very informal. Thank you for putting this out. I'm currently putting together an LS3 that needed a Bore, .30 to clean it. Only to find out, I shouldn't have. It made the block weaker. I picked up Hypereutectic pistons only to find out, they won't be good for 15 lbs of boost (LSA) So, I've been on Forge Piston education hunt. From your video, I think the 4032 would be better. This will be in a car I drive to work on Fridays and State to state to get away (Summertime only) Spinning some tires here and there. I think if I would go with 2618, it will wear quicker and I'll need another block because the block was already weakened the first round. If I wrong if you have any input, pls share. Again, Thanks for time you put into this

Another great video, very informative

Great info I've always been to cheap to run a set of Forged I just melt and replace lol

A lot to know about pistons before choosing one, very good Explanation of the two, i always used the forged back in the day, catch you later Brian and have a great week

nicely done

Very good nicely done 👍

Great video, it's a poorly understood subject. Alcoa is the supplier of 2618 and 4032 alloy to most piston makers in North America. In fact, a division of Alcoa supplies unfinished and semi-finished forgings to many piston companies. Only a few piston makers forge their own blanks, Mahle and DSS do, Wiseco makes many of their own forgings. There may be others making their own forgings, but not many. The advantage of the 2618 alloy is it's high ductility. This is a benefit in high boost, high cylinder pressure applications. The 4032 isn't as ductile. As you said, the 4032 expands much less and is more scuff resistant allowing tighter clearances for quieter operation. I have run 4032 pistons to 4 digit power numbers. The 2618 alloy can really take monster power. Thanks for the video.

"I can't remember all the material" after off the top of his head listening all the material. Well done sir lol 👍

I guess I did not know there were two different materials lol makes sense!

All we used to run was 4032, so it's been around a long time and a proven metallurgy in racing. Of course, everyone and their grandmother wasn't running 8 turbos and making 7200 pounds of boost either!

I'm running AutoTec 4032 forged custom pistons in my 351m build.

I have a 2012 srt 8 392 and I purchased the 4032 pistons and went with a redeye cam lifters and also have long tubes. This will be a street car with very minimal drag runs. I plan on adding forces air and my goals are 650-700 at most rwhp did I make the right decision or would y’all have recommended the 2618? Thanks in advance !

2618 - high expension rate or high expension amount ? Can you elaborate please?

Whats the max power of a 4032 pistons can handle, thanks

Could you comment, 4032 in 3.4 2j street use, approx up to 700whp(pump fuel permitting) ?

Your screen print out info contradicts what you started out saying !!??

It's sili-con not silicone, its not caulk. It's not a bathtub sealant, so lose the E off the pronunciation and you'll be good 👍