backfire through carb, increase or decrease decrease accel pump - MustangForums.com

Go Back  MustangForums.com > Ford Mustang Tech > Classic Mustangs (Tech)
Reload this Page >

backfire through carb, increase or decrease decrease accel pump

Notices
Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

backfire through carb, increase or decrease decrease accel pump

Reply

 
 
 
Old 05-20-2010, 07:33 AM
  #1  
kalli
6th Gear Member
Thread Starter
 
Join Date: Oct 2006
Location: Cork, Ireland
Posts: 6,417
Default backfire through carb, increase or decrease decrease accel pump

Hi all,

buddy with a 396 chevy. backfires through carb when quickly revving up the engine in neutral. it's way better if initial timing is increased to 25 degrees, but i don't want to run the engine like that.
I was thinking maybe it's just getting completely wrong amount of fuel. so with 16 degrees in idle it backfires badly. (268 duration cam. rather mild for that engine)
the carb is a 770 street avenger. the pump is 50cc and yellow cam (all stock).
This (in my opinion) is the biggest you can actually go. is it worth trying to reduce (let's say just use a pink cam). or should we increase the nozzle size?

more or less? :-)

Last edited by kalli; 05-20-2010 at 07:36 AM.
kalli is offline  
Reply With Quote
Old 05-20-2010, 07:40 AM
  #2  
kalli
6th Gear Member
Thread Starter
 
Join Date: Oct 2006
Location: Cork, Ireland
Posts: 6,417
Default

ohhhh forgot to mention. when he revs it a few times (quickly) i get sick behind his car with black smoke. so my guess is it's too much.

I'm mostly wondering: "is too much pump causing backfire through carb" ? so far I always thouht this is ignition only problem
kalli is offline  
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
jwog666
Pipes, Boost & Juice
6
01-07-2018 08:16 AM
Bokeo
Street/Strip
6
10-10-2015 09:28 PM
bradleyb
California Regional Chapter
0
10-01-2015 02:02 AM
1996cobraconvertible
SVT Forums
3
09-30-2015 03:01 PM
mrappe
V6 (1994-2004) Mustangs
0
09-26-2015 11:16 AM


Thread Tools
Search this Thread
Quick Reply: backfire through carb, increase or decrease decrease accel pump


Advertising
Featured Sponsors
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.