Good point about the HAZ and susceptibilty to fatigue. However I'd like to think that I'm safe in assuming that honda tested their engine mount design sufficiently to be able to deal with the extremes of the vehicles life. Therefore a new standard mount shouldn't shear, if however we're now comparing an old welded steel mount to a new billet alloy mount, the playing field has changed somewhat
It's a comparison between two aftermarket mounts. Same company.
One is billet alloy. One is steel.
Same durometer rated bush.
Basically a trader on the DC5 forum is discounting the steel variant because he says he has seen/heard of issues but cannot or will not produce evidence of this. Incidentally, he has just become a dealer of the alloy type. :s
If the stripping of threads is related to the collapse of the mount, then I can't possibly conclude whether the Steel mount is better than the Al Alloy mount. The way the original question was worded seemed to imply that the mount's material would cause a bolt to strip the threads in the box somehow.
I just suggest doing some digging and finding out if the failure of the steel mounts is substantiated, by the sounds of it you already have and the Al mount guy is full of it.
But if the same company makes both, I'd imagine if there were issues they'd now be redesigned or discontinued
This is the point i am trying to make.
He is implying that the steel mount is more likely to cause the thread to strip than the alloy ones!
No evidence, no proof, just his hearsay
Ive done plenty of digging, and i cannot find any issues relating to his claims
Even guys running 500WHP+ dont suffer this fate!
This was his PM to me when i asked him what the issues regarding Steel Vs Alloy mounts
Absolute pish in my opinion.Stoo,
We have had issues with bolts working loose and snapping on solid front mounts and also gearbox threads eventually stripping under normal torque settings, we think it is due to direct shock loading across the thread pitch which might fatigue the alloy thread eventually.
We dont have scientific evidence of this but many racing assumptions are based on our 25+ years racing car building experience and not direct science. We did helicoil the DC5 alloy threads (which we first started doing on alloy gearboxes in 1984)and this cured the problem but it is more of a "corking a leaky dam"than building a proper dam....
Also we consulted some of our dealers who have fitted both Avid and Inovative steel mounts and the story is the same irrespective of make.Thats why we opted for Alloy Billet.
Hope this helps you in your decision.
Regardless of mount material, the forces acting upon the threads are going to be similar or the same.
Here is a picture of the mount in question (Alloy type)
Steel variant (middle of the 3)
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