Boiling Point of Gasoline? - 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 05-25-2009, 12:50 AM
001mustang's Avatar
Registered User
 
Last photo:
Join Date: Dec 2008
Location: TN
Posts: 792
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Boiling Point of Gasoline?

Does anyone know how too find the current boiling point of gasoline from any supplier?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 05-25-2009, 01:14 AM
whinny's Avatar
66 mustang
 
Join Date: Jan 2008
Location: new zealand
Age: 57
Posts: 235
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by 001mustang
Does anyone know how too find the current boiling point of gasoline from any supplier?
Take 1 gallon of gasoline, put in a tin with a lid on it,put it over a butane burner and stand next to it and light it and time it.Get back to us would you??? reminds me of what are the last words of a redneck, here, hold my beer and watch this.
Seriously, who would know that?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 05-25-2009, 02:27 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by 001mustang
Does anyone know how too find the current boiling point of gasoline from any supplier?
The following was obtained HERE. It is relatively dated, but will give some indication.


4.10.1 Vapour Pressure and Distillation Classes.
6 different classes according to location and/or season.
As gasoline is distilled, the temperatures at which various fractions are evaporated are calculated.

Specifications define the temperatures at which
various percentages of the fuel are evaporated. Distillation limits include maximum temperatures that 10% is evaporated (50-70C), 50% is
evaporated (110-121C), 90% is evaporated (185-190C), and the final boiling point (225C). A minimum temperature for 50% evaporated (77C), and a maximum
amount of Residue (2%) after distillation. Vapour pressure limits for
each class ( 54, 62, 69, 79, 93, 103 kPa ) are also specified. Note that the
EPA has issued a waiver that does not require gasoline with 9-10% ethanol to
meet the required specifications between 1st May - 15 September.
END (Bold face is mine)

You will notice the figure 225 degrees C (about 425 deg. F) given as the boiling point- other sites place a wide range of 100-400 deg F. The exact boiling point will change w/altitude and the time of year- gasoline is formulated w/different properties depending on the temperature and geographical location.

If I were to take a WAG, I'd say that you're gonna be close at 375 degrees F.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 05-25-2009, 08:20 AM
001mustang's Avatar
Registered User
 
Last photo:
Join Date: Dec 2008
Location: TN
Posts: 792
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I have seen those specs and have taken note that 10% ethanol mix has a waver from those specs. I will at least try to buy gas w/o ethanol since I don't have any data for that mix. I am aware that gasoline is mixed more volatile in the winter but don't know when the mix is varied. I have noticed that my 64 1/2 289 mustang has experienced carb bowl evaporation post hot stop this year and I never noticed that before; perhaps I was running a winter blend that tank. I am not aware of any manufacturer publishing current gasoline properties. Of course the glass fuel filter post fuel pump in my 67 must lets me see when gasoline is boiling during hot idle. I want to minimize evaporation loses of a volatile gasoline to improve fuel economy and starting post hot engine shutdown. I have taken several steps to reduce 67 underhood temps and I maintain engine temps of about 190F-200F during all conditions. I have noticed less fuel boiling in the glass fuel filter post fuel pump. The car starts faster post hot shutdown. The engines runs good in hot stop and go traffic. The engine no longer stumbles at 4500RPM WOT post hot idle. I still see the fuel boiling sometimes, to a lesser extent, when the fuel pump housing is about 140F.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 05-25-2009, 09:22 AM
4 Jaw Chuck's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Mar 2002
Location: Manitoba, Canada
Age: 46
Posts: 4,934
Wiki Edits: 0

Thanks: 2
Thanked 80 Times in 67 Posts
Gasoline does not have a single boiling point, it is a compound liquid and different fractions boil at different temperatures...hence the wide specification.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 05-25-2009, 10:14 AM
001mustang's Avatar
Registered User
 
Last photo:
Join Date: Dec 2008
Location: TN
Posts: 792
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I agree, different fractions boil at different temps. I see the gas boiling in the glass fuel filter imediately down stream of edelbrock diaphram fuel pump during hot idle when the pump housing is only 140F. The pressure measures about 5psi accoring to my gauge (gauge is not proper range). My pump does not hold pressure very long after shutdown (few minutes at most). Looks like the pump is cavitating during the low flow conditions. I don't want to add a recirculation line to increase flow thru pump. Is it typical for diaphram pumps to cavitate gasoline during low flow conditions at about 140F?

Last edited by 001mustang; 05-25-2009 at 10:21 AM.
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: 2 (0 members and 2 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
5 point harness question sexypizzaman Interior 3 08-27-2008 01:58 PM
Octane Booster Info SLR_65 Engine 46 09-30-2007 09:01 AM
5 point harness help needed elcaminodragster Interior 9 06-22-2007 10:51 PM
The death of conventional hotrodding - alternative power Mad Maggot Hotrodders' Lounge 57 01-23-2006 10:51 AM
5 point harnesses 1meancuda Interior 12 02-25-2004 08:53 AM


All times are GMT -6. The time now is 02:25 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.