PP2 Swaybar Data: Anyone Have It?

[Roadway 5.0]

Is the 350R bar also solid like the PP2?

24mm DIA x 3.6mm wall (0.94 x 0.14 in ) with 8mm (0.31 in) shorter

^^^Pulled this from the GT350 vs GT350R thread and answered my own question.

So long as the above data is true, and the lever arm length is constant, this would make the PP2 solid rear bar significantly stiffer than the GT350R’s, no? Even with the R bar 8mm shorter (and is this shorter at the mounting points?), a 34mm bar completely solid should trump this I would think.

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[Ron]

I’m guessing he worked this from the C&D article that stated a 20% increase for front springs & a 13% increase for the rear springs from the PP1. Math works out exactly (w/a sprinkle of rounding).

You are correct. Tho I prefer 'reverse engineering' v. the highly technical term ... 'sprinkle of rounding'.

 

[BmacIL]

24mm DIA x 3.6mm wall (0.94 x 0.14 in ) with 8mm (0.31 in) shorter

^^^Pulled this from the GT350 vs GT350R thread and answered my own question.

So long as the above data is true, and the lever arm length is constant, this would make the PP2 solid rear bar significantly stiffer than the GT350R’s, no? Even with the R bar 8mm shorter (and is this shorter at the mounting points?), a 34mm bar completely solid should trump this I would think.

Stiffer, yeah, but probably not as much as you'd think. Bar torsional stiffness is primarily a function of the diameter^4. When you have a tube it's a function of OD^4-ID^4.

 

[BlownGP]

24mm DIA x 3.6mm wall (0.94 x 0.14 in ) with 8mm (0.31 in) shorter

^^^Pulled this from the GT350 vs GT350R thread and answered my own question.

So long as the above data is true, and the lever arm length is constant, this would make the PP2 solid rear bar significantly stiffer than the GT350R’s, no? Even with the R bar 8mm shorter (and is this shorter at the mounting points?), a 34mm bar completely solid should trump this I would think.

The way I look at this is it would be splitting hairs.
Unless you track the bars back to back. Would anybody notice a difference?

 

[Roadway 5.0]

Stiffer, yeah, but probably not as much as you'd think. Bar torsional stiffness is primarily a function of the diameter^4. When you have a tube it's a function of OD^4-ID^4.

Wow, you weren’t kidding. I just ran some generic numbers in the Fred Puhl calculator and the difference between a 3.6mm tube and solid was less than 1 lb/in with an array of arm and bar lengths.

It surprises me that more manufacturers don’t use a solid bar; it weighs a bit more but must be much cheaper to manufacture.

 

[Roadway 5.0]

The way I look at this is it would be splitting hairs.
Unless you track the bars back to back. Would anybody notice a difference?

After looking into it, maybe only Mario Andretti would notice the difference.

 

[BlownGP]

Wow, you weren’t kidding. I just ran some generic numbers in the Fred Puhl calculator and the difference between a 3.6mm tube and solid was less than 1 lb/in with an array of arm and bar lengths.

It surprises me that more manufacturers don’t use a solid bar; it weighs a bit more but must be much cheaper to manufacture.

I've seen hollow bars crack but that was a different platform.
I'm going to order the rear PP2 bar Monday.

 

[BlownGP]

After looking into it, maybe only Mario Andretti would notice the difference.

hahahaah. Probably so.

 

[BmacIL]

Wow, you weren’t kidding. I just ran some generic numbers in the Fred Puhl calculator and the difference between a 3.6mm tube and solid was less than 1 lb/in with an array of arm and bar lengths.

It surprises me that more manufacturers don’t use a solid bar; it weighs a bit more but must be much cheaper to manufacture.

Not really actually. A solid bar will cost more to make for sure. More material cost and the tooling to bend them needs to be beefier. Tubular steel is pretty cheap.

 

[Roadway 5.0]

Not really actually. A solid bar will cost more to make for sure. More material cost and the tooling to bend them needs to be beefier. Tubular steel is pretty cheap.

Good point. I was envisioning a manufacturer actually hallowing the steel. Pre-bought tube makes a lot of sense — less time to pump out bars this way too.
———
On a curious note: Would a hallow bar react any faster than a solid? My gut says yes, but maybe this is another instance of minimal gains. Thanks.

 

[Schwerin]

I believe the FPP bar is 25.2 for reference.

 

[2018OFPP1?2]

Part number sticker on the actual part...

 

[BmacIL]

Part number sticker on the actual part...

That's the engineering part number which is different from the service part number.

 

[2015Etrac]

The GT350R bars went up in price? I believe I paid around $125 for both front and rear from Levittown Ford last year.

 

[BlownGP]

The GT350R bars went up in price? I believe I paid around $125 for both front and rear from Levittown Ford last year.

Yup, now there around $125 EACH!!!

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