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Thread: Cardboard-like factory lower engine cover

  1. #31
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    These are the ones I was able to source. Should be able to test them out in the next few days.





    Current: 1993 SC 5.0L Auto Red, 1994 SC 5-speed Teal, 1995 SC 5-speed Chameleon Blue
    Old: 89 SC auto Twilight Blue, 89 SC stick Titanium, 90 35th stick, 92 Sport 5.0L stick, 94 SC stick Black, 1994 SC Auto Teal
    Also: 1992 Feature Mustang Convertible 5-speed Vibrant Red, 1991 BMW 850i 6-speed Red, 1994 BMW 850CSi 6-speed Red

    www.mamn12.com for your mid-atlantic mn12 needs!

  2. #32
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    So, I acquired a lower engine cover for the teal 94. Apparently, at some point instead of using the metal wingnuts pictured in this thread, Ford moved to this plastic fastener. Anyone know when the change to the plastic fastener may have happened? Perhaps anyone with a 94-95 with an engine cover can check and confirm? Both of mine don't have the cover so I cant check.









    Current: 1993 SC 5.0L Auto Red, 1994 SC 5-speed Teal, 1995 SC 5-speed Chameleon Blue
    Old: 89 SC auto Twilight Blue, 89 SC stick Titanium, 90 35th stick, 92 Sport 5.0L stick, 94 SC stick Black, 1994 SC Auto Teal
    Also: 1992 Feature Mustang Convertible 5-speed Vibrant Red, 1991 BMW 850i 6-speed Red, 1994 BMW 850CSi 6-speed Red

    www.mamn12.com for your mid-atlantic mn12 needs!

  3. #33
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    I can't say when they first started using them, but the one on my '95 looks just like the pics Kurt posted and has the black plastic hardware

  4. #34
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    Quote Originally Posted by Ira R. View Post
    I can't say when they first started using them, but the one on my '95 looks just like the pics Kurt posted and has the black plastic hardware
    Thanks IRa!

    I have a feeling that the switch took place for 96-97...like many other things. But, hopefully other folks will chime in to confirm. I gotta clean up the cover and will try to install this weekend using the metal ziptwist wing nuts.
    Current: 1993 SC 5.0L Auto Red, 1994 SC 5-speed Teal, 1995 SC 5-speed Chameleon Blue
    Old: 89 SC auto Twilight Blue, 89 SC stick Titanium, 90 35th stick, 92 Sport 5.0L stick, 94 SC stick Black, 1994 SC Auto Teal
    Also: 1992 Feature Mustang Convertible 5-speed Vibrant Red, 1991 BMW 850i 6-speed Red, 1994 BMW 850CSi 6-speed Red

    www.mamn12.com for your mid-atlantic mn12 needs!

  5. #35
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    Sorry for the very long response. I ran across this thread while at home so I did it right away.
    Name:  metal_wing-nut(20171020_132732).jpg
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    Name:  plastic_front_clip(20171020_132844).jpg
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    I can also state that my 92 has the plastic replacements for the metal wing nuts.
    Kurt K (e-mail)
    SCCoA Member #: 443
    '92 SC AOD -- 11.521s @ 116.748mph, 2.0 AR power
    . . . . . . . . . -- 13.547s @ 101.01 mph, only w/ bolt-ons
    '95 SC 5spd -- All Stock, except 17" Simmons wheels.
    '90 SC 35th Anny 5spd -- 3rd owner, 16k miles
    2 '89 XR7 5spd's -- on their way out, really!

  6. #36
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    Wow....I've swapped that stuff out so many times with whatever crap I could find at Pep Boys. Why can't they all just standardize on a 1/4" diameter fastener of some type.
    Brian Oatway
    '94 SC 2.6KB C4 Auto
    9.956 @ 135.12 mph 1.364 60'
    514rwhp/460rwtq
    "Super Uber Club Member" - per Ira
    SCCoA Member # 705

  7. #37
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    Cleaned the cover, put new plastic fasteners and used the metal wing nuts. I can confirm they fit just right and are, indeed, the replacement for the OEM wingnuts.

    With that said, I'm a little confused at the purpose of this thing . I figured that it was a cover, like in many other cars, that would prevent splash from the road to come up to the engine bay...but with those wingnuts fastened, it doesn't really cover much more than if there was no cover?? At the end, after snapping the pictures, I opted for removing the wingnuts and letting the cover extend over the metal tube. This car is still seeing some all-weather driving so I would rather have that bit more extra shielding until the time comes when the car will stay in a garage most of the time ....still ways away from that. At least now I have the little wingnuts.

    Anywho, on to the pix!





    PS...coincidentally, I found out that the same plastic fasteners used for this cover are the same that are used to secure the clutch hydraulic fluid reservoir.
    Last edited by CaifanSC; 10-22-2017 at 05:24 PM.
    Current: 1993 SC 5.0L Auto Red, 1994 SC 5-speed Teal, 1995 SC 5-speed Chameleon Blue
    Old: 89 SC auto Twilight Blue, 89 SC stick Titanium, 90 35th stick, 92 Sport 5.0L stick, 94 SC stick Black, 1994 SC Auto Teal
    Also: 1992 Feature Mustang Convertible 5-speed Vibrant Red, 1991 BMW 850i 6-speed Red, 1994 BMW 850CSi 6-speed Red

    www.mamn12.com for your mid-atlantic mn12 needs!

  8. #38
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    Quote Originally Posted by CaifanSC View Post

    With that said, I'm a little confused at the purpose of this thing
    Airflow thru the radiator (at speed) is exhausted back and down, onto/around the engine, under the body, then out the rear. That flow depends on positive pressure in the nose and negative pressure under the engine sides and rear. The chin spoiler helps set up the negative pressure, and I believe this skirt helps promote positive pressure flow directly onto the engine, rather than letting it dump out right at the front of the engine.

    Part of this is for engine bay cooling, along w/fuel efficiency and wind noise reduction, I think, by ensuring a smooth flow in, under, around and behind the vehicle, vs. stirring, stalling, tumbling underneath that would increase resistance. I'm still amazed how quiet my 'Anny is regardless of speed. From flush fit glass to this humble skirt, it would be a shame to have such a wind cheating body shape just to kill the airflow underneath. Note: 700 hours of wind tunnel testing gave the 1989 Thunderbird a 0.31 drag coefficient (better than the '89 'Vette).

    Last edited by KMT; 10-22-2017 at 06:05 PM.

  9. #39
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    Quote Originally Posted by KMT View Post
    Airflow thru the radiator (at speed) is exhausted back and down, onto/around the engine, under the body, then out the rear. That flow depends on positive pressure in the nose and negative pressure under the engine sides and rear. The chin spoiler helps set up the negative pressure, and I believe this skirt helps promote positive pressure flow directly onto the engine, rather than letting it dump out right at the front of the engine.

    Part of this is for engine bay cooling, along w/fuel efficiency and wind noise reduction, I think, by ensuring a smooth flow in, under, around and behind the vehicle, vs. stirring, stalling, tumbling underneath that would increase resistance. I'm still amazed how quiet my 'Anny is regardless of speed. From flush fit glass to this humble skirt, it would be a shame to have such a wind cheating body shape just to kill the airflow underneath. Note: 700 hours of wind tunnel testing gave the 1989 Thunderbird a 0.31 drag coefficient (better than the '89 'Vette).

    Heat extraction! Well...good enough reason to me...adding the little wingnuts next time I'm under there Thanks for the input bud!
    Current: 1993 SC 5.0L Auto Red, 1994 SC 5-speed Teal, 1995 SC 5-speed Chameleon Blue
    Old: 89 SC auto Twilight Blue, 89 SC stick Titanium, 90 35th stick, 92 Sport 5.0L stick, 94 SC stick Black, 1994 SC Auto Teal
    Also: 1992 Feature Mustang Convertible 5-speed Vibrant Red, 1991 BMW 850i 6-speed Red, 1994 BMW 850CSi 6-speed Red

    www.mamn12.com for your mid-atlantic mn12 needs!

  10. #40
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    Dec 2014
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    Where does one get that little cover. My 90 never had that under my bumper unless that was added on the later years.

  11. #41
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    The original skirt on my '90 was torn at one of the mount points & ATF soaked, by the time I got the car in 2008. Took two tries from junkyard donors to get the right one to replace it. You might want to post in the parts wanted section to see if someone has a good clean one you can use - you'll most likely need all the fasteners, too. Seems tough to get them cleaned up once they get oil soaked, etc.

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