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Been working on these for 9 months now! The forge tool covers bores from 3.75-4.08 and the piston is available in 2618 and 4032 forging material. These pistons generally come in less than 1/2 gram weight difference between them. I am very excited to build some big power 6's and get some small bore V8's rolling.
Check our Estore for more info
http://i2.photobucket.com/albums/y29...stonswhite.jpg
Hmmm I just heard my lil 290 perk its ears up in the garage... :mrgreen:
What's the differences between the alloys?
How soon before we have them for 360, 390, and 401?
Bob
tufcj
All others are available right now.
2618 is a lower-silicon, high-expansion alloy that is used for extreme-duty racing applications such as NASCAR, ALMS, etc. Due to its high-expansion characteristic, this alloy is engineered with additional piston to bore clearance. At the start of a cold engine, the pistons expanding process can be heard and is commonly referred to as the "piston slap". Once the engine warms up the noise subsides as the piston expands to its running clearance. 2618 is a more ductile alloy and grants higher tolerances with higher resistance to detonation. The forgiving characteristics allow for the most extreme conditions, but longevity is eventually negotiated after countless heat cycles.
4032 is a higher-silicon, low-expansion alloy. Pistons made from this alloy can be installed with tighter piston to bore clearance, resulting in a tighter seal with less noise. 4032 is a more stable alloy, so it will retain characteristics such as ring groove integrity, for longer life cycle applications. Relative to 2618, 4032 is a less ductile alloy, making it less forgiving when used with boosted and/or nitrous applications.
2618 isnt the best choice for a street motor due to its expansion (think driving it cold and ring groove wear). It is better for an all out race engine but will not last as long as 4032. 4032 is a harder alloy which is great for longevity however it is not as strong as 2618 if you have a detonation issue. Both alloys are GREAT choices for forged pistons. I have seen 800hp+ on 4032 without any issues and supercharged, turbocharged, NOS on 4032. Frankly I believe only the top HP AMC engines should ever consider 2618.
Man... If you make some for a 4.125" bore and various CH's for different stroker combos I'm in. :t:
I may be ordering a set sometime in the near future. My Stroked TJ just got killed today in a 55 MPH collision with a big SUV. He turned right in front of me, and I couldn't stop. My stroker only had 18,000 miles on it. I'm pretty sure the engine is toast since the front of the hood is near the windshield (oil and water pouring out from under the Jeep).
First I have to get another TJ (Rubicon I hope).