Club Cobra

Club Cobra (http://www.clubcobra.com/forums/)
-   Small Block Talk (http://www.clubcobra.com/forums/small-block-talk/)
-   -   351 windsor question (http://www.clubcobra.com/forums/small-block-talk/100304-351-windsor-question.html)

SPRBLKXX 10-15-2009 04:58 PM
351 windsor question
 
i have a cobra 351 windsor and have a issue when heavy accel starts popping then takes off hard, ive rebuilt carb, test msd dist, replaced coil, adjusted valves, ck timing, holley carb been gone thru. what else help.

blykins 10-15-2009 05:26 PM
What are you calling popping?

What was your initial/total time set at?

bobcowan 10-15-2009 06:59 PM
You need to check fuel pressure under acceleration. That can be tough to do without a dyno, though.

If you can buy/borrow a LM-1 or something similar, you can see what the AFR is doing when it's popping. I'd bet that's well above 14:1.

Gaz64 10-15-2009 10:53 PM
Quote:
Originally Posted by SPRBLKXX (Post 993665)
i have a cobra 351 windsor and have a issue when heavy accel starts popping then takes off hard, ive rebuilt carb, test msd dist, replaced coil, adjusted valves, ck timing, holley carb been gone thru. what else help.
Some more info about the engine would be helpful, compression, cam timing etc and what carb you're running.

"carb been gone through"? Was it running ok before?

Continous popping? or backfire through the intake on hard acceleration?

Either way the engine's not liking the momentary incorrect A/F ratio, accelerator pump volume correct and duration too long or short (pump nozzle) or volume incorrect (pump cam).

Double pumper, vac sec?

Rick Parker 10-15-2009 11:20 PM
Quote:
Either way the engine's not liking the momentary incorrect A/F ratio, accelerator pump volume correct and duration too long or short (pump nozzle) or volume incorrect (pump cam).
Gary is on the money, check the accelerator pump circuit.

blykins 10-16-2009 06:30 AM
He needs to clarify what kind of popping it is....could be a lot of different things, including detonation if he's hammering it under a load at a very low rpm.

SPRBLKXX 10-16-2009 06:41 AM
The car is a kit car, 200 miles on it. Friends car, Engine is a summit 351w with a holley carb ,I ll get size soon. Under normal driving its fine but under heavy accel it starts popping (like its clearing it throat) then it takes off, breaks tires loose type take off. when you get towards the end of that gear starts again. fuel pressure is 6-7 lbs.

Clois Harlan 10-16-2009 11:55 AM
Sounds like you have a bad accelorator pump on your carb or you are loading up. First check your fuel bowl levels and make sure you are not getting to much gas in your carb.


All times are GMT -7. The time now is 08:49 AM.

Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2025, 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: