2tg full floating rod

[metcap]

Hi guys, anyone done this mod before? Would like to know if there's enough metal on the stock 2tg rods to accept a bushing for full floating piston pin?

[styler]

if you had a few sets of rods i would say you could choose
4 that had the best casting on the small ends.
this could be a good solution but stock rods need resizing, balancing,
floating bush insert and linishing which costs a few hundred dollars.
this could be put towards a new set of rods?

[jeffro ra28]

agree'd.

I know eagle make rods for the 3t. Are these the same as 2t?

There is enough metal there but it would be an expensive operation to perform on a set of shitter stock rods.
Unless smaller diameter custom piston pins could be used which would require the use of custom pistons aswell. Yet again, an expensive operation.

Really not worth the hassle when you could buy a set of forged H beams for about the same cost.

[Sam_Q]

dumb question time: whats the advantage of a floating pin over a press in?

[CHB]

the gudgeon pins in a normal conrod are pressed into the rod. the piston can rotates on the gudgeon pin, but the rod cannot. Full floating means that both the piston and the rod can rotate on the pin. Full floating, because the pin now "floats" in the whole assembly, no longer attached by force to anything. C-clips in the pistons prevent the pin falling out.

[Sam_Q]

thanks I am familiar with that part but whats the advantage/disadvantages?

[w810sc]

easier to assemble piston/rod and moves freely (able to rotate in the piston and rod).
I've heard of stories of the piston pin seizing in the piston in a non floating pin application.

"Would like to know if there's enough metal on the stock 2tg rods to accept a bushing for full floating piston pin?"

like this picture?
fonz

[CHB]

The full floating rods are considered to be "safer" from a reliability standpoint in racing. If for some reason the pin seizes in the piston, you have a backup that allows the rod to rotate in the piston and the engine to continue running till the end of the race (possibly!). The extra clearance from the pin to rod interface does not seem to be an issue as this is what is generally done on big buck high horsepower and high RPM engines. If someone is converting stock rods to this there is always the risk that they are not doing it right. I believe that most of the time they put bushings in the small end when making/converting to this spec. Now if you design a rod to have the bushing you can put how ever much steel around the bushing to make the part strong enough. If you are adding the bushing to an existing rod you have to cut the small end bore oversize for the thickness of the bushing. This will weaken the rod to some extent as the bushing does nothing to add strength and there is less rod material to take the load. If you are doing this kind of stuff to your rod you are probably loading it higher than it was designed for (higher RPM), and then you are weakening it to install the bushing? Does not sound like a good idea to me, but it might work on okay on some applications and not others.

[Sam_Q]

ok thanks, I have been wondering about that

[jeffro ra28]

Has anyone ever seen a rod break at the small end due to not enough metal? Generally speaking, the rods bigest weakness by a long shot is the bolts, then the beam itself.

I think a 2tg rod could very possibly be fitted with a bush. However, its cost would far outweigh the benefits of just buying a billet forged rod to start with!!!!!!!!!

Also, small end bushes tend to fail before the pin seizes in the piston! A full floating rod is simply a way of reducing friction = More mechanical efficiency............