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08-13-2008, 04:54 PM
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CC Member
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Join Date: Aug 2003
Location: Gilbert,
AZ
Cobra Make, Engine: Backdraft #90, 351w,Tremec 3550, SB100 SOLD
Posts: 577
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Not Ranked
Motor mount problems?
I keep getting this annoying vibration in my car that doesn't seem to be traceable. (most of the driveline has been checked for loose fasteners, u-joints, etc.) It has been suggested that perhaps it is a collapsing motor mount. I am not sure what kind of motor mounts are on a Backdraft. Could they collapse? Are they solid? Did Backdraft supply them or are they from my local (since out of business) dealer?
I would appreciate any insight into this, or the darn vibration.
Thanks
SkipB
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08-13-2008, 04:56 PM
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CC Member
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Join Date: Dec 2001
Location: San Diego,
CA
Cobra Make, Engine:
Posts: 2,979
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Not Ranked
It could a bellhousing alignment problem. What type are you using?
__________________
Remember, It's never too early to start beefing up your obituary.
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08-13-2008, 09:26 PM
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CC Member
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Join Date: Jul 2004
Location: Cypress,
TX
Cobra Make, Engine: BDR #491, Red with Black Stripes, 438 Windsor by Keith Craft Racing dynoed at 640hp, Street and Race Prepped.
Posts: 308
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Not Ranked
The motor mounts are supplied by Backdraft. You'll need to jack up one side of the motor and remove the motor mount. Double check to see if the rubber bushing has come loose. If not, then check the other side. If you do one side at a time, then you can easily do it with a jack and a board to spread the load.
Bests, James
__________________
Radical Roadsters of Texas LLC
www.radicalroadsters.com
Backdraft Racing Dealer
281-804-5730
Watch out! You may get BIT!!! 
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08-13-2008, 10:31 PM
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CC Member
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Join Date: Apr 2004
Location: Saint Charles,
IL
Cobra Make, Engine: FFR 5013 - Warmed up & enlarged 302, carb- Painted RED
Posts: 518
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Not Ranked
Check your Harmonic balancer. Mine just failed, after having an untraceable vibration for a while.
__________________
It's not the size of the dog in the fight, it's the size of the fight in the dog!
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08-14-2008, 02:40 AM
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CC Member
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Join Date: Oct 2006
Location: Virginia Beach,
va
Cobra Make, Engine: BDR #250
Posts: 234
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Not Ranked
I had a similar issue and it turned out that the clutch slave was just close enough to contact the body when the motor torqued. It was hard to track down because when I looked under the car it was clear....Good luck Mac
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08-14-2008, 06:09 PM
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CC Member
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Join Date: Aug 2003
Location: Gilbert,
AZ
Cobra Make, Engine: Backdraft #90, 351w,Tremec 3550, SB100 SOLD
Posts: 577
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Not Ranked
Guys,
Thanks. All good things to check.
I think I'll have a few beers, jack the car up and roll underneath tonight. Whoops. Forget it the Olympics are on soon.
SkipB
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08-15-2008, 12:23 PM
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CC Member
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Join Date: Feb 2006
Location: San Diego,
CA
Cobra Make, Engine: BDR #259 351W
Posts: 91
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Not Ranked
Skip,
Does it happen more in 5th than 4th gear when on the hwy.
I have also suspected that the vibration I get is the motor mounts.
John
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08-15-2008, 02:12 PM
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CC Member
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Join Date: Oct 2006
Cobra Make, Engine:
Posts: 8
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Not Ranked
Harmonic/engine vibration
Just finished wrestling with that problem. Call to Frank suggested I install 2 washers under the trans. mount. When we got the car on the lift, sure enough the drive shaft was out of line, not only vertically but even worse ,hoizontally. Installed the washers as suggested, then pulled the rear trans. mount and re-aligned it ( it was out 3/8th of an inch) by re-drilling the mount holes. This has put added stress on the engine mounts which I have not addressed yet. What aggrevates me about this problem and a dozen other issues I've had with this car is not the fact that they are more than willing to advise you on correcting it, but that it was so poorly put togeather in the first place, and as owners we are expected to find and correct the gremlins.
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08-17-2008, 07:52 PM
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CC Member
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Join Date: May 2003
Location: Hudson Valley NY,
NY
Cobra Make, Engine: Backdraft, 302, Tremec 3550. #038
Posts: 863
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Not Ranked
__________________
Kids in the backseats cause accidents, accidents in the backseat causes kids ! Good reason to get a Cobra !!!
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