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Wiseco piston questions

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Post  gcj February 11th 2021, 8:17 am

Hi all:

I need to purchase a set of 4.42" pistons for my 472 - to replace the broken set of L2404´s:

I have looked at what tech info there is on the Wiseco website, but these two issues are vaguely covered - or I am missing the correct place to look:+

1. What is the required piston to bore clearance on the Wiseco? (PTS530A6)

2. Does the Wiseco piston use pressed or floating pins? ( I plan to use the D0OE CJ rods - pressed pins )

G.

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Post  dfree383 February 11th 2021, 8:48 am

Typically modern pistons are sized the the overbore. At .030 you have what they recommend.

I’d suspect them to be floating pins As that set up can be used either way.

But I would suggest you call up their tech line and get it strait from them
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Post  gt350hr February 12th 2021, 1:20 pm

.004 Piston to wall and leave out the supplied locks if you go press fit.

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Post  Mark O'Neal February 14th 2021, 5:22 am

Clearance depends on the application, most aftermarket pistons have .004 built in. They usually make the most power at .005 to .0055. If it's a street car with no power adders, .004 is fine....assuming you're not spinning the snot out of it.

Most aftermarket pistons are set up for full float. However the piston doesn't care which way the rods want to go, they believe in diversity. Innies....outies....it's all the same to them. If it has the grooves for locks you can just leave the locks out and press them on, as gt3550hr stated.

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Post  gcj February 18th 2021, 12:13 pm

Thanks guys for the response.

I had the block bored for the TRW L2404F60 for a bore of 4.42" with a clearance of .004 as recommended by TRW at time of purchase. I only have 2000 miles on the assembly.

Honing should be within the clearance limits. Chime if you disagree.

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Post  dfree383 February 18th 2021, 4:31 pm

You should be fine with a light hone
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Post  Paul Kane February 18th 2021, 7:09 pm

The original TRW L2404's had a piston-to-wall spec of 0.0015"-0.0020".  That said, they will work fine at 0.004".

If the current SpeedPro L2404 is revised and set up for 0.004" P-t-W then that's fine too.

Since you have press fit stock rods, even a cast rebuilder piston set (21cc dish) could work and even weigh about the same as the L2404s, so you most likely wouldn't need to rebalance.  So if your engine makes 500 HP or less then they could be a viable option as well.
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