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Thoughts on 4032 pistons?

Murray_Calavera
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Murray_Calavera Mentor

Murray_Calavera

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Hi all, 

I wanted to get some thoughts on running 4032 forged pistons. 

I'm only looking to make around 300kws as I'll be limited by stock exhaust manifold and internal gate. The car will mainly be used on the street however will get track abuse every other month or so. 

The more I think about it, 2618 just doesn't seem appropriate for my needs. I'll have to run a larger cylinder to wall clearance, so more engine wear, more blow by, more engine noise to filter out with the knock sensors etc and I'll never see anything close to the power they are rated at. 

The issue I'm having is trying to find 4032 pistons, it looks like Supertech and Mahle still do them however at a cost of about $1,500! I was expecting 4032 to be a cheaper option but I guess the price is due to the low demand. 

With my power figure in mind and the cost of 4032's, I'm starting to think if I should just run factory pistons? I had a quick look, seems like I should be able to get a set of new oversized stock pistons for about $700.

Hmm...

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Murray_Calavera Mentor

Murray_Calavera

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The motor is getting torn down anyway as I've spun a bearing. The clock shows 250,000k's at the moment and I think it's had a hair cut when it came in to Australia. 

I haven't pulled apart the block yet but I'd be amazed if I could get away with a hone and reusing the factory pistons. 

I was thinking as I'll need to buy a set of oversize pistons, why not spend a little more and throw some forged pistons in instead. Initially I was thinking I should be able to get a set for around the $1,000 so only a bit more over stock and worth the money. 

If I'm paying double the cost of a factory piston, I'm not sure if it's worth it.

AngryRB Grand Master

AngryRB

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Posted

I pulled 2 RB25's and an RB30 apart recently and they just arnt worn much at all.

There is a larger ring end gap than factory but even the std size hastings rings had a bigger end gap than a 30yr old nissan ring.

They build them good from the factory.

 

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