mighty demon to big - 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 02-15-2005, 09:09 PM
Member
 
Join Date: Sep 2004
Location: claremore
Age: 37
Posts: 79
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
mighty demon to big

my cam specs are

valve lift is .575 intake and .575 exhaust
duration at 50 thousands is 300
lobe seperation is 110 at .050

357 chevrolet
about 11.5:1
victor jr heads
victor jr intake

Problem.
850 mighty demon

WIll I be able to get the motor to idle right with this carb and will the motor run right with this big carb.
What can I do besides getting a new carb or building a bigger motor to fix this problem? example, are there any mods I can do to the carb to make it work...

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-15-2005, 10:16 PM
underdog305's Avatar
Member
 
Join Date: Dec 2004
Location: Greer, SC
Age: 47
Posts: 154
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It sounds like you haven't tried it yet? I would suggest putting that 850 on and seeing what happens..
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-16-2005, 06:39 AM
rick458's Avatar
Wookie
 
Join Date: Sep 2003
Location: La Porte Texas
Age: 50
Posts: 244
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I would think a 750 would be lots better
but give it a shot, looks like it should rev with that cam, at least you have an Idle ease to help out
__________________
Rich

77 Impala
74 260Z (a Work in SLOW Progress)
69 Big Block Chevelle (long gone)
Semper Fi My Brothers
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-16-2005, 06:43 AM
Hotrodders.com Moderator
 

Last journal entry: PICTURE TEST
Last photo:
Join Date: Jan 2004
Location: york pa
Age: 52
Posts: 2,795
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
carb

If you have a 11.5;1 static and a cam with 300@.050 it will never idle no matter what carb you put on...

Keith
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 02-16-2005, 09:43 AM
Ratoflic's Avatar
Big cubic inches small Chevy!
 
Last photo:
Join Date: Nov 2004
Location: Jonquiere, Quebec
Age: 37
Posts: 305
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Too big

Quote:
Originally posted by rick458
I would think a 750 would be lots better
but give it a shot, looks like it should rev with that cam, at least you have an Idle ease to help out
Like Rick, I will definetly go with the 750, there is the requirement for the 850:

Radical Street/Strip Mechanical Up to 260 Manual
Street Rods W/Annular Dual Plane, or or 3,000+ stall
850 425 - 540 Single Plane 18 to 20


There for the 750 Mighty demon:

Radical Street/Strip Mechanical Dual Plane, or Manual
Street Rods 355 - 477 Single Plane or 3,000+ stall
750 Up to 260 18 to 20

Or you can asked to BG tech and they absolutly answer your email with the right carb with the tech sheet to fill.

tech-sales@barrygrant.com

My 0.02 cents

Just for your info, I have a 750 mighty demon with a strong 468 CI...

Stephane
__________________
Chevy man forever!
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 02-16-2005, 12:30 PM
Member
 
Join Date: Sep 2004
Location: claremore
Age: 37
Posts: 79
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
demon

I already have the 850 on the car. I would prefer to not sale it, lose money and then have to buy another demon. If I have to then I will but I would prefer to get some ideas on how to make this one work decent.

Anybody have any idea of the hp differences I can expect from using my 850 mighty demon instead of getting the correct size carb.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 02-16-2005, 12:46 PM
Ratoflic's Avatar
Big cubic inches small Chevy!
 
Last photo:
Join Date: Nov 2004
Location: Jonquiere, Quebec
Age: 37
Posts: 305
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Re: demon

Quote:
Originally posted by mychevystang
I already have the 850 on the car. I would prefer to not sale it, lose money and then have to buy another demon. If I have to then I will but I would prefer to get some ideas on how to make this one work decent.

Anybody have any idea of the hp differences I can expect from using my 850 mighty demon instead of getting the correct size carb.
-You can remove and play with the ''Jet'', it can be a solution!

Just my 2 cents

Stephane
__________________
Chevy man forever!
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 02-26-2005, 11:22 AM
Technical Support Barry Grant
 
Last photo:
Join Date: Jul 2003
Location: Dahlonega, GA
Posts: 1,503
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Running an 850 on an engine of this size will most likely result in a rich idle, poor acceleration, and possibly lean wide open throttle. A 750 would be a much better choice. You've most likely listed your advertised duration. 300 duration @ .050" for a cam of this size would not seem normal.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 02-26-2005, 07:24 PM
lluciano77's Avatar
Short changed on common sense
 
Last photo:
Join Date: Jun 2003
Location: california
Age: 37
Posts: 3,548
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by mychevystang
I already have the 850 on the car. I would prefer to not sale it, lose money and then have to buy another demon. If I have to then I will but I would prefer to get some ideas on how to make this one work decent.

Anybody have any idea of the hp differences I can expect from using my 850 mighty demon instead of getting the correct size carb.
That is what Ebay is for. You can sell it and keep most of its value, and then buy a the right one. I have tried out about 8 carbs on my engine this way. I usually end up breaking even, or just loosing the cost of shipping.
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



All times are GMT -6. The time now is 09:00 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.