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Author
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Topic: Pressed piston pins???
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Bloose
Gearhead Posts: 621
From: Milwaukee, WI
Registered: Dec 2001
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posted 03-01-2005 03:38 AM
   
Hey guys, whats the advantage to pressed pins piston pins? IE, why do the OEM's press the pins. What is the advantage to Floating pins? It would seem that there would be less work to install floating pins over pressed? Is there a down side to floating pins?B-loose
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rustang@home
Journeyman Posts: 94
From: Clarion, PA
Registered: Jan 2004
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posted 03-01-2005 06:23 AM
My guess is the pressed pins are lower cost for the manufacturers. Both assembly and less parts (spiro-locs and bushings).
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 03-01-2005 10:52 AM
It's all about time and cost.
Also, they are a bit quieter which was a concern in Detroit as V-8 engines began to develope more power.
Pressed pins are cheaper to install.
Full floating pins usually use bushed rods.
Full floating pin engines are always faster.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Bloose
Gearhead Posts: 621
From: Milwaukee, WI
Registered: Dec 2001
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posted 03-01-2005 06:37 PM
I thought it would be a cost issue but HD motors use full floaters. I've watched them go together and assembly time is really small. Smaller I'm sure than pressing them. The only thing is the small end has to be kept to very close tolerences and run on a precision hone. I would think that a pressed pin would have to be kept fairly close too but maybe not as much so. I was just wondering why they even sell pressed rods aftermarket. The extra cost is minimal and is easily made up with not having to have the rods pressed on the pins. Plus there is the HP advantage. So I was wondering if there was some disadvantage to floating pins like longevity. Something that's not important in a race motor but is definitely in a street and stock motor. Thanks,
B-loose [This message has been edited by Bloose (edited 03-01-2005).]
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 03-01-2005 07:57 PM
Noise was the primary reason in passenger cars.
It is not an issue in HD applications.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Bloose
Gearhead Posts: 621
From: Milwaukee, WI
Registered: Dec 2001
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posted 03-01-2005 07:59 PM
quote:
Originally posted by Moneymaker:
Noise was the primary reason in passenger cars.
Cool! quote:
It is not an issue in HD applications.[/B]
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