Blower Carb CFM? - 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 07-29-2010, 03:13 AM
QParker's Avatar
Six Offender
 
Last photo:
Join Date: Apr 2010
Location: Fairbanks, Alaska
Posts: 203
Wiki Edits: 0

Thanks: 4
Thanked 0 Times in 0 Posts
Blower Carb CFM?

I took this off the BDS site:

http://blowerdriveservice.com/faq.php

It says :" To measure CFM on a blown engine:
{(CID x RPM) ÷ 3456} x {Boost ÷ 14.7) + 1} = CFM required.

So on a 292 I6 spinning 6000RPM w/ 10#'s it'd be:
(292x 6000)÷ 3456x (10÷ 14.7)+ 1= 851CFM Right?


P.S: where the #?*! is the #?*!ing divide key on the key board? I just copied and pasted the one from the link...
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-29-2010, 03:14 AM
QParker's Avatar
Six Offender
 
Last photo:
Join Date: Apr 2010
Location: Fairbanks, Alaska
Posts: 203
Wiki Edits: 0

Thanks: 4
Thanked 0 Times in 0 Posts
I also found this to find the final compression ratio:

Final Compression Ratio (FCR) = [ (Boost÷14.7) + 1 ] x CR

That would mean I'm running around 14:1 compression with 8.5:1 base and 10 lbs boost...
Maybe I'd better go with 8:1 to bring it down to around 13:1...
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-29-2010, 05:08 AM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,206
Wiki Edits: 326

Thanks: 595
Thanked 757 Times in 647 Posts
8.0:1 SCR and 8 lbs boost should be pump gas friendly, assuming you built in a good squish and rounded all sharp corners in the chamber.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-29-2010, 05:32 AM
345 desoto's Avatar
Registered User
 
Last photo:
Join Date: Sep 2006
Location: Skaneateles, NY Summer/Port St.Lucie, FL Winter
Age: 70
Posts: 416
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I'm running 2 500 CFM Carter Competition series carbs with 5 lbs boost on a 291 Hemi, and it goes like a scalded dog...
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-29-2010, 12:05 PM
bigdog7373's Avatar
Of course it's fast
 
Last photo:
Join Date: May 2010
Location: florida
Posts: 2,673
Wiki Edits: 0

Thanks: 13
Thanked 48 Times in 48 Posts
The divide button is a forward slash.
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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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
blower carb kwopper07 Engine 2 02-10-2008 09:46 PM
750 cfm carb - tuning - smaller jets or 600cfm? 65truck Engine 8 01-20-2004 06:13 PM
holley 600 cfm carb ap0001 Engine 9 01-17-2004 09:30 AM
ENGINE, Blower, Pistons, Heads, Carb, Distributor, and more 84Z Hotrodders' Lounge 0 12-21-2003 10:54 PM
what makes cfm in a carb fordracing Engine 3 04-01-2003 10:01 AM


All times are GMT -6. The time now is 01:40 PM.


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.