Cold Starts Chevy 468

Old 02-22-2013, 09:38 AM
  #1  
nashtychevy
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Aug 2007
Location: Fremont Ohio
Posts: 3
Default Cold Starts Chevy 468

Only 350 miles On 468 BBC ,750 Holley No Chocke ,Why Do I Have To Pour Gas In Carb When Its Cold To Start ,When Its warmed Up No Problem ,Carb Is squirrting Gas Thanks Nashty chevy
nashtychevy is offline  
Old 02-22-2013, 06:00 PM
  #2  
mopar1968
Senior Member
RACING JUNKIE
 
mopar1968's Avatar
 
Join Date: Dec 2006
Location: Abingdon,Virginia
Posts: 3,579
Default

Well first of all, In my opinion a 750 isn't big enough for a engine that size, I tried a 750 on my 440 Mopar in my Challenger same problem as you have bought a 850 and it starts and runs fine cold or warm :!: JMO


Mark
mopar1968 is offline  
Old 02-23-2013, 12:28 AM
  #3  
ken0069
Senior Member
MASTER BUILDER
 
Join Date: Jul 2003
Location: Concord, Va
Posts: 201
Default

EDIT
ken0069 is offline  
Old 02-23-2013, 10:28 AM
  #4  
jmarksdragster
Senior Member
RACING JUNKIE
 
jmarksdragster's Avatar
 
Join Date: Jul 2007
Location: Florida
Posts: 635
Default

It has to to do with the amount of vaporized fuel and combustion ability of the engine. A pump gas engine with lower compression will not burn the fuel as easily, so it needs more vaporized fuel to get it to light. Since it's cold, you have no heat in the induction to help, so you have to add even more fuel to get enough of it to vaporize. Add to that a larger cam with lower vacuum at idle and it's even worse. If it's a street car a carb with a choke is the way to go, if it's for race only you can just pump about 3 times before starting it. One other area depends on what 750 it is, the newer HP carbs have a relocated idle circuit that makes it harder to pull fuel through the idle circuit. The idle jet really needs to be at the bottom.
jmarksdragster is offline  

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


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service