Well, thereís fixed amount of stress. Have to analyse it in objective and quatitative manner. Where is this stress applied and how is it absorbed?
Currently, most of this stress is concentrated on rear backbone of frame above where removable piece bolts in. Due to leverage around that point (think wedges of pie with tip at that point), tiny 0.5 degree of flex becomes 3-4cm movement at contact patches. You can upgrade suspension all you want, but main problem is wet-noodle frame that connects everything.
What solidly mounting engine does is spread out forces thatís concentrated on one spot of frame onto multiple widely spaced points so that no one spot of frame is overloaded as it is now.
Example of this is try standing one-legged balanced on small 3cm rock. All your weight is concentrated on single spot. Thereís extreme pressure on that spot huh? Without shoes, you can tear skin apart! And imagine bloke comes along and shoves you. Youíre already unstable and he can shove you off easily.
Now, compare that with standing with both feet on ground widely-spaced apart... say 60-70cm. Load is distributed over wide surface area. Even with bare feet, you wonít feel much pressure since your weight isnít concentrated on any one spot. Now try to shove you over. Much, much more difficult as you have lot more support and stability.
Thatís what solidly mounting engine to frame does. It spreads out load from single spot onto 6 widely-spaced points. Force from tyres & wheels had less leverage and bends frame out-of-whack a lot less. More stable cornering at high speeds. Numerous people have done this and reported much improved performance.
Last edited by DannoXYZ; 8-24-2019 at 10:19 PM.