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Old 12-28-2003, 07:55 PM
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full floating wrist pins

i'm going to ask a stupid question. what is the purpose of full floating wrist pins? all the engine builder around here act like it's a big secrete or some thing. thanks

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Old 12-28-2003, 08:31 PM
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Full floating pins are commonly used on race engines, because they can be easily serviced, piston, rod eye and pin slide together and pin is retained with clips. The pin is free to rotate in all bores and this adds a little more surface area to act as a bearing. Press pins are harder to assemble. but add a little more latteral stability to the piston rod assembly and tend to be quieter.
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Old 12-29-2003, 10:26 AM
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i understand all that, but is there any horse power to be gained? it couldn't be much if any, i wouldn't think. thanks
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Old 12-29-2003, 02:10 PM
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Re: full floating wrist pins

Quote:
Originally posted by 406 ss monte
i'm going to ask a stupid question. what is the purpose of full floating wrist pins? all the engine builder around here act like it's a big secrete or some thing. thanks
One thing I love about oldsmobiles, full floating pistons/pins

The bad part is that even though many olds engines came with full floating pistons, no-one sells them after market.
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Old 12-29-2003, 04:25 PM
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Chevys had'em, Fords had'em, Dodges had'em, too. Big deal. The principal advantage of a full floater is that if one wear surface was to gall or seize, there would still be an operating pivot point for the piston or rod to move on.
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Old 12-29-2003, 06:42 PM
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IF this is a street driven car, I wouldn't get "floating wrist pins". As stated earlier, racers like them because maintenance is easier, but they break down an engine after every race ...sometimes. On the street you won't even come close to that. It adds no horse power, it's more expensive to do, AND if one of them retaining rings fail and the pin goes into the cly. wall ...kiss the block good bye! ...Stick with the pressed in pins! ...You won't be sorry! Good Luck! ...Mark
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Old 12-29-2003, 09:17 PM
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i wouldn't mind sticking with pressed pins but all the after-market h-beam rods i've seen have full floating pins. i bought a set of new 5.7" Cat h-beam rods to use in my 406. my pistons are set up to go either way so it's no big deal there. i'll make sure i have good pin retainers on them though. anybody got a preference on them?
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Old 12-29-2003, 09:22 PM
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If all you can get is full floating rods, I would not worry about it, go ahead and use them. Just about all hi po engines of the late sixties, early seventies used floating wrist pins. There is a very slight HP to be gained by using them. I have never heard of a properly installed retaining clip failing and destroying a block. If it is installed right and the clearances are correct, it's bullet proof.

Vince
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Old 12-29-2003, 10:04 PM
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Be careful not to bend the tension out putting them in and if they are the stamped out style there will be a slight edge on one side,put it toward the outside of piston,give a gentle twist to be sure they are seated.
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