Piston pins - pressed in or full floating? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 8 (permalink) Old 03-05-2003, 02:29 PM Thread Starter
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Piston pins - pressed in or full floating?

What are the advantages/disadvantages to pressed in pins vs full floating? Which is better?
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post #2 of 8 (permalink) Old 03-05-2003, 05:27 PM
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Piston pins - pressed in or full floating?

6 of one and a half dozen of the other.

Hipo engine builders and the likes usually go floating. They are easier to take apart (well, except for them darn spiral locks) without special equipment. But a lot of street strip engines use pressed fit.

So, a lot depends on what pistons and rods you buy.

Larry............
96 Ford F350 PSD CC DRW
64 Fairlaine 500 rust bucket/future Tbolt clone with 501 BBF
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post #3 of 8 (permalink) Old 03-05-2003, 06:13 PM
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Piston pins - pressed in or full floating?

ya really no big benefit either way in my opinion. Full floating give you the flexibility to mount the pistons on the rods at home, but that may be offset by the pain-in-the-ass learning curve for installing the spirolocks (two per side, four per piston)
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post #4 of 8 (permalink) Old 03-06-2003, 03:48 PM
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Piston pins - pressed in or full floating?

The main advantage for your engine is it gives an added edge again sticking a wristpin and having galling problems. That and they are easy (relatively) to take apart for reuse.
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post #5 of 8 (permalink) Old 03-06-2003, 06:14 PM
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Piston pins - pressed in or full floating?

The 302 in my mustang used press-fit 289 rods, and did just fine. They had good machine work and ARP Pro-Series bolts installed. Their beams weren't even ground down, and they performed flawlessly.

Personally, I believe spirolocks are more of a PITA than they are worth... Especially since the local machine shop has a fixture that will remove pistons from rods without damage.

Good Luck!
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post #6 of 8 (permalink) Old 03-06-2003, 11:04 PM
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Piston pins - pressed in or full floating?

Are Teflon buttons available for full-floating pins?


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post #7 of 8 (permalink) Old 03-07-2003, 12:13 AM
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Piston pins - pressed in or full floating?

They may be available but, why? Teflon is to soft to be a good pin retainer. Better is "Nylatron" plastic. Buttons are ONLY used in drag race engines that are disassembled regularly. Using them in any other application WILL result in extreme wear to the bores in line with the buttons.

Some people can break a cannon ball, in a sandbox, with their bare hands.
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post #8 of 8 (permalink) Old 03-07-2003, 05:26 PM
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Piston pins - pressed in or full floating?

Thanks for the information!

I have been using those damn buttons for 20 years on my motorcycles and was wanting to use them even on my engine project, I'm glad that I hadn't already bought a set.

Thanks again!


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