logo
12 Port News - Features
12 Port History
Casting Numbers
Online Store
Tech Tips
Become a Member
Previous Thread
Next Thread
Print Thread
Rate Thread
#91924 05/23/17 12:26 AM
Joined: May 2017
Posts: 11
J
Active BB Member
OP Offline
Active BB Member
J
Joined: May 2017
Posts: 11
Greetings
I am a newbie. I decided to have a mechanic add an Offy 5416 intake and a Holley 8007 4 barrel carburetoralong with HEI as a lot of forums recommended this setup. I am experiencing back fire on deceleration. Can anyone share their experience. The motor is stock. I appreciate any constructive comments.

Joined: Apr 2004
Posts: 3,566
Likes: 37
1000 Post Club
****
Online Content
1000 Post Club
****
Joined: Apr 2004
Posts: 3,566
Likes: 37
Are you sure it is back firing? Could it be more of a exhaust rattle or rasping?

What is the timing settings?


Inliner Member 1716
65 Chevelle Wagon and 41 Hudson Pickup
Information and parts www.12bolt.com

Joined: Aug 2014
Posts: 821
G
Major Contributor
Offline
Major Contributor
G
Joined: Aug 2014
Posts: 821
Timing is probably too advance or you're running too lean. Check the timing first.

Joined: May 2017
Posts: 11
J
Active BB Member
OP Offline
Active BB Member
J
Joined: May 2017
Posts: 11
I will ask them to check the timing thanks.

Joined: May 2017
Posts: 11
J
Active BB Member
OP Offline
Active BB Member
J
Joined: May 2017
Posts: 11
Running to lean?

Joined: Aug 2014
Posts: 821
G
Major Contributor
Offline
Major Contributor
G
Joined: Aug 2014
Posts: 821
Originally Posted By: James1972
Running to lean?


Meaning not enough fuel being dumped through the carb. Lean or too advanced will both give backfires.

How about you check the timing and tell us what it's at then pull a spark plug and take a picture of the sparky-end for us to see? Reading spark plugs is an art that many have lost.


Last edited by gbauer; 05/24/17 10:59 AM.
Joined: May 2017
Posts: 11
J
Active BB Member
OP Offline
Active BB Member
J
Joined: May 2017
Posts: 11
Thanks for the great advice. I will try to do it this weekend and a will post the result. I appreciate the guidance.


Moderated by  stock49, Twisted6, will6er 

Link Copied to Clipboard
Who's Online Now
0 members (), 125 guests, and 27 robots.
Key: Admin, Global Mod, Mod
Newest Members
Hairyclive, THarper, crash, ocean1907, Jabez House
6,816 Registered Users
Sponsored Advertisement
Sponsored Advertisement
This Space is Available
Powered by UBB.threads™ PHP Forum Software 7.7.5