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never really seen this before...oiling passage at the wrist pin

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Old Apr 10, 2007 | 03:10 AM
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Default never really seen this before...oiling passage at the wrist pin

I come across this on yahoo auctions japan today. Thought it was sorta interesting. Anyone on here ever do this? Pretty obvious what it does. They pretty much say its for oil cooling, and wrist pin cooling. thoughts?
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Old Apr 10, 2007 | 11:24 AM
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Default Re: never really seen this before...oiling passage at the wrist pin (junkyard racer)

It means they "free-floated" the pins, theirfore they need oil.
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Old Apr 10, 2007 | 11:41 AM
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Default Re: never really seen this before...oiling passage at the wrist pin (DonF)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF &raquo;</TD></TR><TR><TD CLASS="quote">It means they "free-floated" the pins, theirfore they need oil. </TD></TR></TABLE>exactly. they machined the rods to use aftermarket pistons w/ floating wirst pins.
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Old Apr 10, 2007 | 03:11 PM
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Default Re: never really seen this before...oiling passage at the wrist pin (gsrious)

ahh...ok.
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Old Apr 10, 2007 | 05:23 PM
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Default Re: never really seen this before...oiling passage at the wrist pin (gsrious)

anyone care to explain what a floating wrist pin is.
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Old Apr 10, 2007 | 05:29 PM
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It means it doesn't have to be pressed on to the rods, and can pretty much spin freely. They use a snap ring to hold them in place.
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Old Apr 10, 2007 | 05:37 PM
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Default Re: (crxowner)

i wonder which aftermarket piston's wristpin size got used when they got the machining measurement
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Old Apr 10, 2007 | 05:59 PM
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Default Re: (crxowner)

i see....what advantages do they offer over stock?


do the stock wrist pins have a descriptive term as well ?
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Old Apr 10, 2007 | 06:55 PM
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Default Re: (Suck my DX)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suck my DX &raquo;</TD></TR><TR><TD CLASS="quote">i see....what advantages do they offer over stock?


do the stock wrist pins have a descriptive term as well ?</TD></TR></TABLE><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suck my DX &raquo;</TD></TR><TR><TD CLASS="quote">i see....what advantages do they offer over stock?


do the stock wrist pins have a descriptive term as well ?</TD></TR></TABLE>

stock wrist pins must be pressed into the rod and the piston floats on the pin. aftermarket wristpins float within the rod and the piston floats on the pin which is held from sliding out of either side with a circlip.

this means under normal circumstances you need aftermarket rods to use aftermarket pistons. unless you mod your stock rod as such.

what this guy wanted to do originally was stick something like a wiseco piston in his motor and didnt want to shell for the rods which probably werent needed anyway if it was a mild set up. so he had the little end of the rod machine a few .001 larger, then drilled that chamfered oil hole to lube the wristpin.

thats all. its nothing big, been done many times and theres nothing wrong with it on a sub 250whp/10k rpm NA motor as long as the hardware is upgraded as well.
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Old Apr 10, 2007 | 07:02 PM
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Default Re: never really seen this before...oiling passage at the wrist pin (Suck my DX)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suck my DX &raquo;</TD></TR><TR><TD CLASS="quote">anyone care to explain what a floating wrist pin is.</TD></TR></TABLE>
It means that when you put it in water it sits at the top of the water i think..?
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Old Apr 10, 2007 | 07:08 PM
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Default Re: never really seen this before...oiling passage at the wrist pin (Sol Rosenberg)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xDicktonesx &raquo;</TD></TR><TR><TD CLASS="quote">

stock wrist pins must be pressed into the rod and the piston floats on the pin. aftermarket wristpins float within the rod and the piston floats on the pin which is held from sliding out of either side with a circlip.

this means under normal circumstances you need aftermarket rods to use aftermarket pistons. unless you mod your stock rod as such.

what this guy wanted to do originally was stick something like a wiseco piston in his motor and didnt want to shell for the rods which probably werent needed anyway if it was a mild set up. so he had the little end of the rod machine a few .001 larger, then drilled that chamfered oil hole to lube the wristpin.

thats all. its nothing big, been done many times and theres nothing wrong with it on a sub 250whp/10k rpm NA motor as long as the hardware is upgraded as well.</TD></TR></TABLE>

ahhh i see....thanks for the clarification...

now you say that it is good under ~250whp/10k rpm.... are you referring to the process done to the above rods? or any floating wrist pin in general?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sol Rosenberg &raquo;</TD></TR><TR><TD CLASS="quote">
It means that when you put it in water it sits at the top of the water i think..?</TD></TR></TABLE>
BAN!
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Old Apr 10, 2007 | 07:15 PM
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Default Re: never really seen this before...oiling passage at the wrist pin (Suck my DX)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suck my DX &raquo;</TD></TR><TR><TD CLASS="quote">

ahhh i see....thanks for the clarification...

now you say that it is good under ~250whp/10k rpm.... are you referring to the process done to the above rods? or any floating wrist pin in general?


BAN!
</TD></TR></TABLE>

no im talking about stock honda rods. they are plenty for streetable NA is most scenarios. notice i didnt use any "always" or "never" statements.
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Old Apr 10, 2007 | 08:11 PM
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in the auction thread, it says 'for cooling'. like, its only an efficiency thing.
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