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08-29-2007, 03:43 PM
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CC Member
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Join Date: Apr 2007
Location: Mission Viejo,
ca
Cobra Make, Engine: Lone Star Classics, 351W/435 HP, alum heads, roller cam, forged pistons
Posts: 16
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Not Ranked
Engine backfiring question
I just got my Temporary Operating Permit the other day, so I can now drive my Cobra legally on the street. One thing I noticed is that I get a loud backfiring, which I hear at the exhaust pipe on the passenger side, when I let off on the gas after a HARD acceleration. This doesn't happen when I'm cruising at low RPM's, just after I really get into it. Any ideas/suggestions to alleviate this situation?
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08-29-2007, 03:50 PM
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Canadian Gashole
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Join Date: Mar 1999
Location: Quebec, Canada,
QC
Cobra Make, Engine: Johnex 427 S/C, 351W, 472 HP, 444 lbs. torque
Posts: 2,455
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Not Ranked
Sounds to me like the header bolts may be loose or the gasket is broken allowing air to get sucked into the exhaust.
Wayne
__________________
Don't get caught dead, sitting on your seat belt.
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08-29-2007, 04:17 PM
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CC Member
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Join Date: Jan 2002
Location: Bridgewater,
NJ
Cobra Make, Engine: B & B
Posts: 1,323
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Not Ranked
Wayne -nailed it. Sounds like a leak to me.
__________________
Just enough knowledge to build a cobra and be dangerous...
You can observe a lot from just watching.
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08-29-2007, 04:19 PM
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CC Member
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Join Date: Jan 2002
Location: Bridgewater,
NJ
Cobra Make, Engine: B & B
Posts: 1,323
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Not Ranked
Congrats by the way for getting your car on the road!
__________________
Just enough knowledge to build a cobra and be dangerous...
You can observe a lot from just watching.
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08-29-2007, 05:46 PM
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CC Member
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Join Date: Feb 2006
Location: Thousand Oaks,
CA
Cobra Make, Engine: Classic Roadster
Posts: 1,367
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Not Ranked
With mine it was always the flange bolts getting loose. Keep em tight and no more back fire. Hope that's all it is. I use the RTV Copper silicone for a sealer there too. Good luck!
John
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08-30-2007, 10:40 AM
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CC Member
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Join Date: Apr 2007
Location: Mission Viejo,
ca
Cobra Make, Engine: Lone Star Classics, 351W/435 HP, alum heads, roller cam, forged pistons
Posts: 16
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Not Ranked
Wayne-Thanks for the diagnosis, I'll retighten the header bolts when I get home from work
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08-30-2007, 10:43 AM
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CC Member
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Join Date: Apr 2007
Location: Mission Viejo,
ca
Cobra Make, Engine: Lone Star Classics, 351W/435 HP, alum heads, roller cam, forged pistons
Posts: 16
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Not Ranked
Jams-Thanks for congrats on getting the car on the road. As you may know, it's no small feat in California! I grew up in NJ, I wish the Ca. registration/smog process was a little easier!
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08-30-2007, 10:49 AM
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CC Member
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Join Date: Apr 2007
Location: Mission Viejo,
ca
Cobra Make, Engine: Lone Star Classics, 351W/435 HP, alum heads, roller cam, forged pistons
Posts: 16
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Not Ranked
John-thanks for your input also. Seems like everyone sees it the same way. Nice color on your Cobra, I just painted mine Titanium Gray Metallic, and it came out really well. I'll post new pics this weekend.
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