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  1. #481
    Armchair General Mirek's Avatar
    Join Date
    Jun 2007
    Prague / Eastern Bohemia
    Liked 4,477 Times in 1,934 Posts
    IMO it's more precisely described in homologation regulations.
    Stupid is as stupid does. Forrest Gump

  2. #482
    Junior Member
    Join Date
    Apr 2017
    Liked 19 Times in 10 Posts
    Well Nick, if Metal Matrix "Composite" is not a composite material, then what is? For once, the public copy of the regulation shows the same information as the working copy in this case:

    The use of composite is allowed for the following parts:
     Timing cover
     Air filter box
     Air ducts for cooling (cockpit and boot (FR) / radiators / intercooler / engine auxiliaries / brakes)
     Homologated exterior bodywork parts (see article 902)
     Windscreen lower trim
     Door trims (FR)
     Dashboard (FR)
     Seats
     Supports and fixings fitted inside the cockpit (except seat brackets) and inside the rear boot
     Protection covers fitted inside cockpit and inside rear boot (FR)
     Foot rest for driver and codriver (FR)
     Console / support for switches…
     Steering wheel
     Heat shields
     Protections of the bodywork parts (side, floor, inner wheel arch)
     Leakproof box for fuel tank (see article 401) (FR)
     Underbody protections (see article 902)
     Mountings for front and rear bumpers
     Headlight units and tail light units
     Additional headlights housings (see article 503)
     Paddles for power assisted gearshift control
     Supports and fixings fitted inside the engine compartment (except engine / transmission supports)
     Discs for differentials
     Baffles fiited inside engine oil sump and transmission housing
     Fuel tank internals
     Electric connecting box
    All composite material parts fitted directly on the engine (parts mentioned in Article 3) and the parts fitted in the cockpit or in the boot mentioned above (FR) must be made from fire‐
    retardant material (seats and driver / codriver equipment / energy‐absorbing material: see FIA standarts). The external face of the part must have a V0 level of acceptance respecting
    the "UL94" US standard (fire‐retardance capability).
    Basically, this list precludes any meaningful use of MMC on these cars.

    Somewhere in this discussion indeed lies the truth about the finish on the part. What can I say, it's painful to see all three cars go out with the same broken part (whatever the circumstances), and it's not the first time they failed this year...

  3. Likes: NickRally (10th October 2017),sonnybobiche (10th October 2017)
  4. #483
    Senior Member racerx1979's Avatar
    Join Date
    Jun 2017
    Liked 193 Times in 93 Posts
    Unfortunately a bad design can not be saved by a coating or process at the end of the day. If they had hub failures breaking the connection for the lower wishbone at the ballpoint for many rallies than its time to design a new hub. Or at lease revised the connection of the ball joint to hub. I bet they will do this moving forward.

    On thing I noticed when looking at the pics was the diameter of the l tapered ball joint stud. It was unnecessarily huge in my opinion. Never see Any WRC cars use such a large stud. This could result to huge loads on the hub and also reduce the amount of thickness in that area due to space limitations. On most arms we’ve worked on we would use a 5/8 heim (rose) joint or 14 mm in metric. The Hyundai ball joint stud looks huge. Like 20 mm, but this could be the image being zoomed in. The shear loads on a 14/16 mm heim or rose joint is more than enough for lower control arms used in McPherson suspension. I bet they will also change mountings for the shock body and the shock top mounts as well because the loads are going straight up from the ball joint to the top mounts. I’ve been lucky enough to see Toyota, Ford and Citroen suspension components and in terms of design and tech (not strength) Toyota is above Citroen which is above Ford. Have no clue what Hyundai stuff looks like. They’re actually pretty good at keeping things behind the scenes . Oh and the weight of the Toyota assemblies is incredibly light.
    Last edited by racerx1979; 10th October 2017 at 10:39.

  5. Likes: Munkvy (11th October 2017),OldF (11th October 2017),sonnybobiche (10th October 2017)

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