engine is sluggish - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old Dec 10th, 01, 03:20 PM Thread Starter
 
Join Date: May 2001
Location: Poquoson, va
Posts: 25
Post

I just installed a Holley 750 on my 406 with twisted wedge heads. When I run it through the gears it is fine, but when I floor it in third below 2500 rpm it feels sluggish. When I am above 2500 it pulls fine. Do I need a lighter secondary spring or a heavier one?
78lt is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old Dec 10th, 01, 03:35 PM
DjD
Retired
Dennis
 
DjD's Avatar
 
Join Date: Apr 1999
Location: Fortuna, CA
Posts: 26,453
Garage
Post

Sluggish or a bog? If it bogs then maybe a lighter spring would help. What cam are you using? It may not make power before 2500 and third gear can't over come being out of the power zone like 1st or 2nd can.

------------------
...Dennis
"The '69, the '96 & the club"
DjD is offline  
post #3 of 3 (permalink) Old Dec 12th, 01, 06:38 PM
Senior Tech
Cameron
 
Join Date: Oct 2000
Location: Lexington, KY
Posts: 771
Post

I have a 406 with Trick Flow 23 degree heads, Performer RPM intake, XE274 camshaft, and a 750 Holley that I just put on last weekend. I currently have the white spring (lightest spring you can get) on the secondary diaphram. I have great low end response. Even with the 2.73 rear end and the four speed, mine doesn't bog at any RPM. I can easily lug mine around at 1200 RPM in fourth gear. I can stomp the gas at 1300-1500 RPM in first gear and melt the right rear tire (posi needed bad).

What are your cam specs? What kind of intake do you have? What gears are you running in the rear? A big cam and a single plane intake with high gears would perform as you describe. What did you have on it before and how did it perform?

When you say "bog", what do you mean? Does the car accelerate good in third then bog when the secondaries open? If that were the case, you would need a heavier secondary spring. Or, does it just not want to gain RPM? If that were the case, you might want to try a lighter secondary spring and/or look at the way your carburetor is tuned more closely. Another possibility is, like Dennis suggested, your engine, with that particular carburetor might not be in its power band below 2500 RPM. The higher gearing of third gear could just be magnigying the problem.
Cameron 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