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Anyone use Nippon FRM pistons?

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Anyone use Nippon FRM pistons?

 
Old 03-25-2018, 11:16 PM
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Honestly, I really wanna stay with the 87.25mm piston choice, but the block I'm using is so out of round and scored that they said +.25mm may not cure it. The 2nd block I'm building will get a very light finish hone but no overbore and will run OEM factory pistons with an APC coating to tighten up the clearance. I'm running 2 mules here :P
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Old 03-26-2018, 04:41 AM
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Originally Posted by Charper732 View Post
That's not really saying much unless you have personal experience with failure from the coating being too thin. ...the thickest nikasil you'll ever see is .2mm...helluva lot thinner than what we are dealing with here.
Lets look at things with logic, an unmolested bore is 87mm the FRM liner is .5mm his piston is .5mm over. When the cylinder is bored out .5 over there won't be .2mm which is the boring service limit, but rather you will have ended up removing the FRM sleeve entirely. If the bores are that messed up, you might as well sleeve the block, at that point FRM pistons become a moot point unless you can find FRM sleeves.
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Old 03-26-2018, 05:48 AM
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I didnt realize he said 87.5...thought it was .25

so yeah, that block will literally be a boat anchor with no liner at all...
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Old 03-26-2018, 06:12 AM
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Which brings up a question I've wondered, why doesn't anyone make FRM sleeves?
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Old 03-26-2018, 07:23 AM
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They do, they're not cheap though.
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Old 03-26-2018, 08:22 AM
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There is also the option of Nikasil plating the block after sleeving, but as correctly pointed out, it is very expensive. There are a couple of folks running Nikasil plated liners in the 2ZZ engine, which also has this MMC material problem.
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Old 03-31-2018, 12:02 AM
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Old 03-31-2018, 12:05 AM
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So I came across a block that could be bored to 87.25mm, so I placed an order for the corresponding Nippon Racing pistons. Obviously these are nowhere as nice as the OEM units, but I'm curious to see how far these can be pushed before destruction. The PZX piston has been APC coated on the skirts and thermal coated on the crown. That piston will be running in a different mule.
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Old 03-31-2018, 08:47 AM
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WPC Treatment is another option, you can read a few articles on Moto IQ about it.
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Old 03-31-2018, 09:21 AM
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Very nice information! I would be interested in WPC for engine bearings. Thank you so much!
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