Tunnel Ram on a Chevy 350 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 04-21-2008, 07:25 PM
Registered User
 
Last photo:
Join Date: Jun 2007
Location: carlisle, Indiana
Posts: 9
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Tunnel Ram on a Chevy 350

I have recently purchased a brand-new tunnel ram with two 600 cfm holley's for my GM 350, with double hump heads. I know the two 600's are too much for my motor, two 450 cfm would possibly work. My question is, since I already own the 600's will the engine perform if I only connect the one, and the other one just set there for looks.

Thanks, Mark

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-21-2008, 07:29 PM
carsavvycook's Avatar
My 2 cents worth
 
Last photo:
Join Date: Sep 2007
Location: Lakeside, CA
Age: 58
Posts: 2,855
Wiki Edits: 3

Thanks: 2
Thanked 2 Times in 2 Posts
No! It will not distribute the a/f mixture to the other cylinders.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-21-2008, 07:37 PM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 7,095
Wiki Edits: 0

Thanks: 4
Thanked 541 Times in 457 Posts
Quote:
Originally Posted by markedwarde
I have recently purchased a brand-new tunnel ram with two 600 cfm holley's for my GM 350, with double hump heads. I know the two 600's are too much for my motor, two 450 cfm would possibly work. My question is, since I already own the 600's will the engine perform if I only connect the one, and the other one just set there for looks.

Thanks, Mark
Tunnel rams are just plane doggie on the street, they are a race engine item and as such like to work way up in the RPM range. The problem isn't so much of excessive carb CFM (although its present) but is more of a lack of signal in the venturis. This is the result of several factors, the port runners being too big softens the signal, the plenum being really too big softens it more, and all the reversions from too many overlapping cylinders causes gaps and unwanted augments to the metering signals.

So it's really tough to get these things to function on the street with all this chaos going on. It can be made acceptable but it is a pain to set up. Basically you've got to reduce port and plenum volume. And still---------?

It works best with a manual gear box and really stiff gears out back, which takes you back to where I started, high revs.

Bogie
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-21-2008, 07:42 PM
NEW INTERIORS's Avatar
Believe in yourself !!!!!!
 

Last journal entry: 41 WILLYS FRAME
Last photo:
Join Date: Jul 2007
Location: In My Shop..
Age: 49
Posts: 10,317
Wiki Edits: 0

Thanks: 1,442
Thanked 693 Times in 509 Posts
I was running two 600's and went to two 450's and it ran a lot better.My motor was a 11 to 1. In a 2300 pound 32 roadster.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 04-21-2008, 08:31 PM
Registered User
 
Last photo:
Join Date: Jan 2006
Location: cornelius
Posts: 710
Wiki Edits: 0

Thanks: 47
Thanked 12 Times in 12 Posts
Most tunnel rams have adapters to run a single carb. Never used one but it might be worth a try. If its a mild 350 you might be able to get away with one of the 600 carbs you already have.

Jordon
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 04-21-2008, 08:48 PM
Registered User
 
Join Date: May 2007
Location: Winona, mn
Posts: 79
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
If you can do without the tunnel ram look for a street motor I seriously recommend selling the tunnel ram and getting a performance dual plane manifold.. search for test comparisons etc and you can find some intakes that will make you driving on the street much more enjoyable.. unless you already have a high stall converter, gearing, the know how to tune that thing right.. and a love high rpms, engine wear, and money for more gas. Tunnel rams can be rather cranky with the warm up as posted above as well. You can get dual plane manifolds that perform very well from off idle to over 6k rpms. the throttle response and power band were 90+% of street engine driving occurs is substantially better with the dual plane manifold..
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last 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 for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hi. just wondering why the 350 chevy small block is so good... judgedredd Hotrodders' Lounge 78 06-25-2010 09:01 AM
350 chevy help joesnova2 Engine 7 11-08-2009 06:46 AM
Tunnel Ram information xntrik Engine 79 08-17-2008 03:15 PM
El Camino Engine - 350 Chevy or 455 Pontiac bjam2 Engine 16 08-07-2007 04:45 PM
tunnel ram w/ 2 450 cfm or 1 single 850 cmf what do you think is beter?? tiresmoke55 Engine 12 08-28-2006 10:15 PM


All times are GMT -6. The time now is 02:49 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.