valve size VS gas mileage - Hot Rod Forum : Hotrodders Bulletin Board -- 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
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 07-01-2012, 11:21 AM
Registered User
Join Date: Mar 2012
Posts: 18
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
valve size VS gas mileage

hey everyone , just curious if 2.02 valved heads on a SBC will change my gas mileage negatively VS 1.94 heads

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 07-01-2012, 11:49 AM
eloc431962's Avatar
Evil Wicked Mean And Nasty
Last wiki edit: Pilot bearing and bushings
Last journal entry: roof repair
Last photo:
Join Date: Nov 2008
Location: back in the garage.
Posts: 13,766
Wiki Edits: 37

Thanks: 50
Thanked 31 Times in 26 Posts
Originally Posted by i heart square bodys View Post
hey everyone , just curious if 2.02 valved heads on a SBC will change my gas mileage negatively VS 1.94 heads
Let us know everything about the build so we can see what you really need. what all has been done to the engine ?
And to answer you question i don't think you will see any noticable difference in the gas mileage. from the 194 - 2.02 valves. JMO

Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-01-2012, 12:42 PM
Registered User
Last photo:
Join Date: Jul 2004
Location: At Speed
Age: 54
Posts: 2,004
Wiki Edits: 0

Thanks: 44
Thanked 206 Times in 182 Posts
All other things being the same, then no it will not hurt the mileage. Anything that lowers the dynamic compression of the engine will lower its efficiency, including fuel efficiency.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-01-2012, 12:56 PM
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 31
Posts: 9,544
Wiki Edits: 0

Thanks: 20
Thanked 404 Times in 377 Posts
The loss in mileage would only be very slight, probably not noticed. It depends a LOT on the head. Any oem sbc head doesn't need 2.02" valves and unless they are very heavily ported they will hurt performance. BUT refit a 220cc head with 1.94" valves and you'll lose power and mileage. It all needs to work together.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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
Gas mileage recnepswilliams Engine 12 09-12-2010 03:17 PM
2000 Sunfire Horrible gas mileage, and erratic gas gauge jordan2011 Engine 8 08-07-2008 07:56 AM
gas mileage kirk Engine 1 02-28-2008 08:32 PM
gas mileage V6 vs V8 firestone Engine 12 02-01-2008 04:44 PM
gas mileage john seawell General Rodding Tech 1 08-25-2005 03:55 AM

All times are GMT -6. The time now is 04:50 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.