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This business of piston slap and concerns about it is crazy.

Forged pistons expand more than cast items, so when they are cold expect them to be smaller than they need to be in the bore compared to cast pistons, they need room to expand, its the nature of the construction and material.

If you planning to thrash the engine stone cold, let alone let the tempature of the oil come up first, stay with cast pistons in a lower powered build, high powered forged internals are not for you, at least its a cheap engine your destroying.

Those who know about piston slap first hand know its only for a minute or 2 till they get some heat into them while idling, they are designed to be perfectly fine while going though this phase during warn up.

It like saying dont run a exhaust or cams because the engine does not sound like a stock one does.......

  • Like 2

JE pistons don't cause the slap, the clearances the machinist picked determine that. If he felt you were going to thrash it, he will make the bore clearance larger to accommodate the expansion.

No big deal, the twin plate drowns those noises out. lol

  • 4 years later...
On 12/16/2014 at 10:08 AM, Piggaz said:

Got a link to it? I've never seen a JUN 78 mm stroker. Interested!!!

I only just found that out also. Been eyeing up their 2.8 stroker. Does anyone know if it uses 121.5mm rods or shorter ones like Tomei? 

Edited by Frracer
  • 5 years later...
On 12/12/2014 at 8:34 PM, BakemonoRicer said:

JUN is still miles ahead....

The kit itself has been used on a number of 8 second cars.

Too bad HKS discontinued their Step 3 kit that thing was tasty as well.

Did a hks 2.9 stroker kit exist as I found a GTR that som one selling that says it's a 2.9 hks but I can't find much info on it 

4 hours ago, [SKYHI] said:

Did a hks 2.9 stroker kit exist as I found a GTR that som one selling that says it's a 2.9 hks but I can't find much info on it 

as  far as I can rember the 2.9 was a rb30 custom crank in a rb26 block nothing to do with hks maybe its has a 2.8 and they have rounded it up, solid 4th post in 20 years i thought i was winning

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