Hks Pistons Noisy? 2.8 Stroker..

[DannyzGTR]

Just wondering if other ppl have the same issues with hks pistons or stroker kits. Mines pretty noisy for till

About 20 mins of driving..

[Piggaz]

What's the piston to bore clearance that HKS recommend and what was the engine actually built to?

[Piggaz]

Double post

[scotty nm35]

It's obviously the piston's fault, not the clearance.

Get on to your machinist/engine builder and ask him exactly what Piggaz asked above. My guess is he set it up loose because you want to lean on it hard, hence you will get a bit of noise.

[djr81]

Isnt it usually either 2 or 4 thou depending on what type of alloy the piston is?

[drpheel]

very common for forged pistons, p2w ( piston to wall clearance ) will vary depending on the load / heat the engine will endure , Since forged piston expand with heat (more then stock) some builder will run a higher piston to wall clearance then recommended by the MFG so the piston will not hit the cyl wall when it will expand a bit more depending on the load / heat. This is what you call piston slap. It will quiet down as your car gets to operating temperature because of the expansion of the piston with the heat.

If the noise persists when hot, now that would be another issue.

I would like to know if you have the build sheet or could ask your engine builder what piston to wall clearance he is using for your aplication

[DannyzGTR]

Well the apparently hks gave pre cut rings for the 2.8 stroker kit.. I wanna hear from hks piston owners lol

[KiwiRS4T]

Ring gap is one thing. Difference between piston size and bore size is another.

[Ben C34]

Well the apparently hks gave pre cut rings for the 2.8 stroker kit.. I wanna hear from hks piston owners lol

I like the way you haven't answered how much piston to bore clearance you are running.

[KiwiRS4T]

Well the apparently hks gave pre cut rings for the 2.8 stroker kit.. I wanna hear from hks piston owners lol

And aren't all piston rings "pre-cut"? They would be pretty hard to get on the pistons otherwise. Gap can only be adjusted by removing material!

[DannyzGTR]

Not sure on piston to bore gap, machinist took care of that..

[GTRPSI]

So ask your machinist.....he set it up.

If you want to quieten it down you could always get new bigger pistons and rings and rebore/hone it correctly or friction coat the piston skirts which takes up a little clearance.