Club Cobra

Club Cobra (http://www.clubcobra.com/forums/)
-   FE TALK (http://www.clubcobra.com/forums/fe-talk/)
-   -   Fuel Pressure on a 427 FE (http://www.clubcobra.com/forums/fe-talk/143916-fuel-pressure-427-fe.html)

cobrabritt83 08-03-2020 03:05 PM

Fuel Pressure on a 427 FE
 
Looking to see what electric fuel pump I would need for my 427 s/o. The engine is build for street use and has a duel quad setup with Holley 450 carbs. I'm not sure how much flow I need i a pump or how much fuel pressure this engine requires.

FredG 08-03-2020 05:44 PM

Fuel pressure
 
You are not going to need a large electric pump for a carb. Regardless of the pump, it would be wise to install a fuel pressure regulator and gauge on the fuel line. Holley 4150 & 4160 carbs can get a little finicky when it comes to fuel pressure. Holley recommends 5-7 psi.



Fred


Quote:

Originally Posted by cobrabritt83 (Post 1480821)
Looking to see what electric fuel pump I would need for my 427 s/o. The engine is build for street use and has a duel quad setup with Holley 450 carbs. I'm not sure how much flow I need i a pump or how much fuel pressure this engine requires.


bobcowan 08-03-2020 11:22 PM

Do not confuse volume with pressure. Volume is dependent on the fuel pump and lines. Pressure is dependent on the the pressure regulator.

Carburetors generally need about 5-7 PSI. Webers generally need about 3 psi. And EFI generally needs about 55-60 psi.

A 427 needs a reasonable flow, like 255 lph or so. Racing at 7,000 rpm will need a bit more. FI will also need a bit more. Doesn't matter if it has 1 carb or 4, it needs about that much fuel. If you're planning on e-85, it will need about 25% more than that. There are a number of web sites available that will help you calculate the fuel requirements.

blykins 08-04-2020 03:34 AM

4-5 psi is all you want.

cobrabritt83 08-04-2020 01:30 PM

Thanks for the help

maui 08-13-2020 04:43 PM

fuel pressure at idle is one thing it's another when you're on the throttle. Thats were the volume portion mentioned earlier becomes important. You can run a gauge on it if you think it's an issue. Other wise when pressure gets too low the car will nose over as it goes dead lean.


All times are GMT -7. The time now is 03:58 PM.

Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2020, 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: