carb mod

General Engine Discussion

Moderator: John_Heard

Post Reply
Message
Author
joe69Z
Posts: 55
Joined: Mon Oct 03, 2011 10:37 am
Location: Kinston N.C.

carb mod

#1 Post by joe69Z » Fri Jun 15, 2012 6:50 pm

I'm just milled off chock horn on a 650 cfm double pumper, Will I need to change jets or any thing else to make carb still perform like it was, Just trying to get a little more airflow? Or have I just messed up! Pro's and con's about this modification? :scratch:

User avatar
wikd69
Posts: 2077
Joined: Sat Feb 23, 2008 12:42 pm
Location: Rocklin, CA
Contact:

Re: carb mod

#2 Post by wikd69 » Sat Jun 16, 2012 1:53 am

joe69Z wrote:I'm just milled off chock horn on a 650 cfm double pumper, Will I need to change jets or any thing else to make carb still perform like it was, Just trying to get a little more airflow? Or have I just messed up! Pro's and con's about this modification? :scratch:
I know thats something that a lot of folks have done in the past for the same reason. I don't think you'll have an issue, other than having lost the ability to choke it at start up. Of course, all of the 4150 HP carbs run without chokes, etc.
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

joe69Z
Posts: 55
Joined: Mon Oct 03, 2011 10:37 am
Location: Kinston N.C.

Re: carb mod

#3 Post by joe69Z » Sat Jun 16, 2012 10:57 am

wikd69 wrote:
joe69Z wrote:I'm just milled off chock horn on a 650 cfm double pumper, Will I need to change jets or any thing else to make carb still perform like it was, Just trying to get a little more airflow? Or have I just messed up! Pro's and con's about this modification? :scratch:
I know thats something that a lot of folks have done in the past for the same reason. I don't think you'll have an issue, other than having lost the ability to choke it at start up. Of course, all of the 4150 HP carbs run without chokes, etc.
True, We didn't use chock anyway, Thanks Great numbers on your car!

User avatar
wikd69
Posts: 2077
Joined: Sat Feb 23, 2008 12:42 pm
Location: Rocklin, CA
Contact:

Re: carb mod

#4 Post by wikd69 » Sat Jun 16, 2012 1:14 pm

joe69Z wrote:
wikd69 wrote:
joe69Z wrote:I'm just milled off chock horn on a 650 cfm double pumper, Will I need to change jets or any thing else to make carb still perform like it was, Just trying to get a little more airflow? Or have I just messed up! Pro's and con's about this modification? :scratch:
I know thats something that a lot of folks have done in the past for the same reason. I don't think you'll have an issue, other than having lost the ability to choke it at start up. Of course, all of the 4150 HP carbs run without chokes, etc.
True, We didn't use chock anyway, Thanks Great numbers on your car!
thanks :-)
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

User avatar
BracketNova
Posts: 618
Joined: Sat Apr 25, 2009 6:46 pm
Contact:

Re: carb mod

#5 Post by BracketNova » Wed Jun 20, 2012 7:06 pm

I did it to mine before I had my carb converted to E85. You gain 30 cfm, give or take. You might have to go one jet richer, but it really depends on what your car likes.
"I always compare drag racing to lighting $100 bills on fire, only it's more expensive." - Craig W.

Check out my website...
http://www.findmoneyraces.com


'71 Nova E85
6.69 @ 100.2 MPH 9/6/14
1.4257 60'
1700' DA

13:1 439 BBC
3330 lbs

User avatar
wikd69
Posts: 2077
Joined: Sat Feb 23, 2008 12:42 pm
Location: Rocklin, CA
Contact:

Re: carb mod

#6 Post by wikd69 » Thu Jun 21, 2012 1:58 pm

BracketNova wrote:I did it to mine before I had my carb converted to E85. You gain 30 cfm, give or take. You might have to go one jet richer, but it really depends on what your car likes.
Wow, really ? Does the choke horn cause that much restriction in inlet air flow ? I never suspected that. Thats a good thing to learn.
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

User avatar
BracketNova
Posts: 618
Joined: Sat Apr 25, 2009 6:46 pm
Contact:

Re: carb mod

#7 Post by BracketNova » Thu Jun 21, 2012 5:38 pm

That's what my carb guy said.
"I always compare drag racing to lighting $100 bills on fire, only it's more expensive." - Craig W.

Check out my website...
http://www.findmoneyraces.com


'71 Nova E85
6.69 @ 100.2 MPH 9/6/14
1.4257 60'
1700' DA

13:1 439 BBC
3330 lbs

Post Reply

Who is online

Users browsing this forum: No registered users and 5 guests