Club Cobra Gas-N Exhaust  

Go Back   Club Cobra > Cobra Talk Areas > ALL COBRA TALK

Nevada Classics
MMG Superformance
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
Advertise at CC
Banner Ad Rates
MMG Superformance
MMG Superformance
MMG Superformance
December 2024
S M T W T F S
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31        

Kirkham Motorsports

Like Tree7Likes

Reply
 
LinkBack Thread Tools Display Modes
  #21 (permalink)  
Old 06-11-2024, 04:49 AM
CC Member
Visit my Photo Gallery

 
Join Date: May 2015
Posts: 626
Not Ranked     
Default Updates

I DID see spark jumping, replaced the engine ground wire, cleaned up everything real good. Still have noise, wondering if the cylinder not firing caused other damage? There is no way in my mind that any sort of internal issue is going to cause spark to jump.

Also why just that hole?
\
It DOES sound like its up high though f#ck i hate stuff like this…
I ran it with the vc off and everything looks right. Pulled the rockers off, they are fine pushrods don't look beat up.
I did not look at valve springs…
__________________
Superformance 1764
Ford Racing 427 SB
Reply With Quote
  #22 (permalink)  
Old 06-11-2024, 05:10 PM
Gaz64's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2008
Location: Brisbane, QLD
Cobra Make, Engine:
Posts: 2,797
Not Ranked     
Default

The spark is from WHERE to WHERE?
The side of the plug lead to the head?
And it is still happening with a good plug AND lead?
And a video of the sparking jumping please, or have you torn too much?
Gary
__________________
Gary

Gold Certified Holden Technician
Reply With Quote
  #23 (permalink)  
Old 06-11-2024, 05:40 PM
Gaz64's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2008
Location: Brisbane, QLD
Cobra Make, Engine:
Posts: 2,797
Not Ranked     
Default

Double post. Moderators, Please fix this issue.
__________________
Gary

Gold Certified Holden Technician

Last edited by Gaz64; 06-11-2024 at 05:42 PM..
Reply With Quote
  #24 (permalink)  
Old 06-13-2024, 04:29 AM
CC Member
Visit my Photo Gallery

 
Join Date: May 2015
Posts: 626
Not Ranked     
Default Well think i figured it out (sort of)

Removed the entire exhaust on the captains side and discovered a (now) obvious exhaust leak Between the top of the header flange and the head not really visible with the header on…Still doesn't explain the spark.

I DID just have a system ground problem though, (the battery ground wire was actually cracked clear through, amazed it ran at all)…

I installed a new stout engine ground along with battery ground.
Things i checked
#7 compression
#7 valve spring on the seat force
#7 topside valve gear inpect -rockers push rods

I put it all together and ran it and used the stethiscope no internal noise…

Back to exhaust leak…

Why i was sseing arcing is still a mystery, UNLESS the leak would blow the boot off? Dunno
__________________
Superformance 1764
Ford Racing 427 SB
Reply With Quote
  #25 (permalink)  
Old 06-13-2024, 04:48 AM
Gaz64's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2008
Location: Brisbane, QLD
Cobra Make, Engine:
Posts: 2,797
Not Ranked     
Default

From Post 1:
Got home and started troubleshooting, discovered that the tick/tap stopped when plug wire 7 was pulled off the distributor. Tried switching plugs and wires no change.

An exhaust leak will likely stop when you pull the corresponding plug lead.
An exhaust leak can also sound like spark jumping.
I don't think it is spark from the plug you are seeing, but more than likely combustion still occurring as the exhaust valve opens, and hence "looks" like a spark through your "leak".
Fix the leak and you'll fix the "spark" issue.
Tommy and eschaider like this.
__________________
Gary

Gold Certified Holden Technician

Last edited by Gaz64; 06-13-2024 at 04:50 AM..
Reply With Quote
  #26 (permalink)  
Old 06-13-2024, 07:22 AM
Buzz's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2000
Location: St. Lucia, West Indies, WI
Cobra Make, Engine: Unique 427SC 383 stroker
Posts: 3,767
Not Ranked     
Default

Quote:
Originally Posted by Gaz64 View Post
From Post 1:
Got home and started troubleshooting, discovered that the tick/tap stopped when plug wire 7 was pulled off the distributor. Tried switching plugs and wires no change.

An exhaust leak will likely stop when you pull the corresponding plug lead.
An exhaust leak can also sound like spark jumping.
I don't think it is spark from the plug you are seeing, but more than likely combustion still occurring as the exhaust valve opens, and hence "looks" like a spark through your "leak".
Fix the leak and you'll fix the "spark" issue.
^^This^^
I had a similar issue that turned out to be an exhaust leak. It's amazing how much a void in a header gasket can sound like a mechanical tap.
__________________
Tropical Buzz

Grant me the serenity to accept the things I cannot change, the strength to change the things I can, and the wisdom to know the difference. -(wasn't me)

BEWARE OF THE DOGma!! Dogmatism bites...
Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 10:45 PM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy
Links monetized by VigLink