[pyrohamish]

Well after too much 4wding on the belly my crossmember was rooted so I made a new one. had to get the grinder out to cut holes to access the old bolts.

[buzbox]

Nice work, personally I'd weld some tabs on the joints for extra bracing.

[Fatzook]

Any pics of it fitted? I'll be making a new one for mine soon, as it is also munted, but I'll be using 12-16mm ally flatbar. I can't help but think that your design will sit as low, if not lower than the standard cross member

[pyrohamish]

I shall take some tomorrow

[suzukiboy]

That is well bent.

Did the same on mine.

[steak_knife]

Fatzook wrote:

Any pics of it fitted? I'll be making a new one for mine soon, as it is also munted, but I'll be using 12-16mm ally flatbar. I can't help but think that your design will sit as low, if not lower than the standard cross member

Think that'll do?????

[pyrohamish]

you could use FB but I would defiantly add some vertical structure to stop the bending

the three bolt heads sit about 5mm lower than the chassis rails, if I was making from scratch again I would use 30x30RHS. I used 40 because i had it lying around.

I only noticed how bent it was because i had to fix a gasket on the exhaust which started leaking after a bit of a bump. The rubber mounts were on all weird angles.

[Fatzook]

Looks good! Better clearance than OEM cross member on the whole.

[Fatzook]

steak_knife wrote:

Fatzook wrote:

Any pics of it fitted? I'll be making a new one for mine soon, as it is also munted, but I'll be using 12-16mm ally flatbar. I can't help but think that your design will sit as low, if not lower than the standard cross member

Think that'll do?????

Yep. 16mm 6061 T6 flatbar would be stronger than 8mm steel.

[royce]

Fatzook wrote:

steak_knife wrote:

Fatzook wrote:

Any pics of it fitted? I'll be making a new one for mine soon, as it is also munted, but I'll be using 12-16mm ally flatbar. I can't help but think that your design will sit as low, if not lower than the standard cross member

Think that'll do?????

Yep. 16mm 6061 T6 flatbar would be stronger than 8mm steel.

If its was a boring grade of mild steel 6061 t6 would be as strong size for size

[pyrohamish]

Just because its stronger doesn't meant it will still be suitable
considering moments of inertia

40x40FB
I=880000mm^4
16x40FB
I=164000mm^4
and deflection of a pin-pin beam
delta=(F*L^3)/(48*E*I)

E steel ~235GPa
E Alu ~80GPa

given this the Aluminium beam will deflect ~16x more than the RHS
or in other words put some vertical structure in