351w Rod Pins?

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wickedmach1

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Apr 8, 2003

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Austin, TX

Jul 5, 2004

#1

• Jul 5, 2004

• #1

What is the difference and benefits/cons between bushed (floating) fit pins and press fit pins on 351w rods? What does this actually mean and what would be preferred on a 393 stroker?

 

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fastcoupe68

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Mar 10, 2004

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nj

Jul 5, 2004

#2

• Jul 5, 2004

• #2

A floating piston which the rod has a bushing so the pin floats has much less friction. less friction more horsepower. The bushed rod and piston combo also has less side load on the cylinder walls.

 

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D.Hearne

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Sep 29, 2000

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south louisiana

Jul 5, 2004

#3

• Jul 5, 2004

• #3

Another benefit to floating pins----- if the pin happens to seeze in either the piston or rod bushing, it may still pivot in whichever location it's not seezed ( ie : the rod or piston)

 

brianj5600

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Sep 19, 2003

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Middle TN

Jul 5, 2004

#4

• Jul 5, 2004

• #4

And you can assemble your own rod/pistons. No press needed.

 

brianj5600

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Sep 19, 2003

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Jul 5, 2004

#5

• Jul 5, 2004

• #5

Bushed rods are an engineers answer. Pressed pins are an accountants.

 

Route666

Active Member

Aug 16, 2003

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Brisbane, Australia

Jul 5, 2004

#6

• Jul 5, 2004

• #6

Yep the floating ones are stronger and more efficient. You could coat them with a low friction coating I would assume too, although there may be too much pressure on their surface for the coating to handle, so you might not be able to. If you could, it would give you an even more efficient junction.

 

Max Power

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Jul 31, 2003

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St Paul

Jul 6, 2004

#7

• Jul 6, 2004

• #7

""Another benefit to floating pins----- if the pin happens to seeze in either the piston or rod bushing, it may still pivot in whichever location it's not seezed ( ie : the rod or piston)""

LOL... if any part of my rod bushing is seizing, I think I would want to know about it right away!!!

Seriously, I think pressed is fine for most street applications....

 

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fastcoupe68

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Mar 10, 2004

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nj

Jul 6, 2004

#8

• Jul 6, 2004

• #8

Max Power said:

""Another benefit to floating pins----- if the pin happens to seeze in either the piston or rod bushing, it may still pivot in whichever location it's not seezed ( ie : the rod or piston)""

LOL... if any part of my rod bushing is seizing, I think I would want to know about it right away!!!

Seriously, I think pressed is fine for most street applications....

Click to expand...

I am pretty sure you will know right away because you will most likely do some major damage, on the other hand if you have a foating set up and it does happen to sieze you are less prone to damage. If I am correct the floating set up was designed for racing applications and high rpm durability

 

brianj5600

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Sep 19, 2003

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Jul 7, 2004

#9

• Jul 7, 2004

• #9

I'm guessing that early engines, 1890's, had floating pins, and pressed was to speed production and save money.

 

Max Power

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Jul 31, 2003

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St Paul

Jul 7, 2004

#10

• Jul 7, 2004

• #10

I think you may be right fastcoupe.

The reality probably is that in street application, seizing one part of the rod won't be noticed until the secong part locks.

 

D

D.Hearne

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Sep 29, 2000

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south louisiana

Jul 7, 2004

#11

• Jul 7, 2004

• #11

brianj5600 said:

I'm guessing that early engines, 1890's, had floating pins, and pressed was to speed production and save money.

Click to expand...

The 1890's ?? We're digging back a bit far ain't we?

 

Max Power

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Jul 31, 2003

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St Paul

Jul 8, 2004

#12

• Jul 8, 2004

• #12

LOL! Those 1890s pistons were the size of coffee cans and yeilded a 3:1 compression ratio!

 

brianj5600

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Sep 19, 2003

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Jul 8, 2004

#13

• Jul 8, 2004

• #13

I stand by my statements.