351w Rod Pins?

[wickedmach1]

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?

 

[fastcoupe68]

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.

 

[D.Hearne]

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]

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

 

[brianj5600]

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

 

[Route666]

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]

""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....

 

[fastcoupe68]

""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....

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]

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

 

[Max Power]

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.Hearne]

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

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

 

[Max Power]

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

 

[brianj5600]

I stand by my statements.