Carb issues - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old Dec 24th, 08, 12:46 PM Thread Starter
Senior Tech
Brandon
 
Join Date: May 2004
Location: Monroe, NC
Posts: 2,092
Garage
Carb issues

Hey guys new issue for me now.

Changed out the cam from theCc 270H as a lifter locked up and ate a lobe.

So changed out to a summit cam .465/.465 282 duration w/ 114 lobe separation. Not as steep as the CC270H but a bit longer duration.

So after this I dropped from the 750 vac sec to a 670 street avenger as the 750 was too much. I just got done rebuilding the 670 last night with all new gaskets, needle valves, the works with a new holley kit.

So, now getting it started was fun as I ended up having to nearly max out the idle to get it to stay running at what I believe to be near the 850rpm area. The exhaust smells of unburnt fuel and is somewhat black. Trying to set for best vacuum has got me stumped on this one. Given that it's a longer duration cam I know the hg would drop but not to the 6hg level. Opening and closing the needles hasn't had any effect. Finally I pulled the vacuum line off the carb from the guage and suddenly the rpms go up and she idles better.

So I'm asking if it's possible that the primaries are too closed up and need to be opened somewhat from below to allow for more air flow?

Now that's about all the info I've got on it at the moment

Brandon J. licence 1NASTY67

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Nantooch is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old Dec 24th, 08, 01:22 PM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,755
Garage
Re: Carb issues

Ignition lead would help. See if the secondaries have a setscrew on the throttle shaft/bracket/base to open them just a hair. I use a feeler gauge to assist, then after done, screw out the screw and start it from the top of the throttle base plate for easier access, or not.

Any action to get the priimary throttle plates closed so idle mixture screws can have an influence

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden enjoy your next chapter.
Everett#2390 is offline  
post #3 of 4 (permalink) Old Dec 24th, 08, 04:21 PM Thread Starter
Senior Tech
Brandon
 
Join Date: May 2004
Location: Monroe, NC
Posts: 2,092
Garage
Re: Carb issues

Got it figured out. Partly to blame was the secondaries being open, fast idle was messed up, but I think the bigger part was that the gasket between the metering block and the carb base on the primary side had a slight tear in it. Straightend out those items and vacuum went to 13 and car idles with barely any idle and the set screws definately have influence now.

Brandon J. licence 1NASTY67

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Nantooch is offline  
 
post #4 of 4 (permalink) Old Dec 25th, 08, 05:28 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,755
Garage
Re: Carb issues

Cool !!

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden enjoy your next chapter.
Everett#2390 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome