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Message: <blockquote data-quote="dvng" data-source="post: 184947" data-attributes="member: 196"><p>do not confused strength and stiffness. High strength does not relate to high stiffness. EG. high strength materials gives smaller x-sections hence lighter but stiffness are sacrificed. Low strength material can give high stiffness..heavier sections. 1mm thk of high strength plate is less stiff than 2mm thk low strength plate. Foaming a chassis will increase the stiffness slightly since the foam substance has lower modulus of elasticity but the a solid section is significantly stiffer than a hollow section..but then you also to look at torsional and bending stiffness which dictates flex stiffness..this is not to be confused with axial capacity or buckling capacity..this are also affected by the effective length of the cross section..zzzzzzzzzz..guys this whole issue of stiffness, strength, buckling, torsional rigidity is very complex. You also have to look at the design of the chassis itself and how the stiffness are derived on the whole. Stiffening at certain portion of the chassis will increase stiffness  but then you also have to look at where it is stiffened..the further from the centre of inertia of the chassis the better increased you will gain. Beware of claims by the manufacturer unless he is a structural engineer like me..as for whether foaming is effective or not..i leave it to you entirely..</p></blockquote><p></p>