Carb Adapter - 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 03-15-2004, 05:22 PM
Erk Erk is offline
Member
 
Join Date: Feb 2004
Location: Vincennes,IN
Age: 25
Posts: 112
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Carb Adapter

I have a Professional Product RPM airgap and its SQUARE BORE.
Now i am getting a Holley 650cfm spreadbore.
I cannot find a square bore 650 vacuum for the life of me..So does an adapter work as a spacer also or is it just an adapter?

-Eric
Reply With Quote
  #2 (permalink)  
Old 03-15-2004, 05:51 PM
lluciano77's Avatar
Short changed on common sense
 
Last photo:
Join Date: Jun 2003
Location: california
Age: 36
Posts: 3,548
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The adapter is a one inch spacer.

Holley just recently started making their squarebore 650 vacuum secondary carb. Why not use an 1850, 600 CFM carb?
Or get a 750 vac. sec. How do you know 650 is the right size?
Reply With Quote
  #3 (permalink)  
Old 03-15-2004, 06:13 PM
Erk Erk is offline
Member
 
Join Date: Feb 2004
Location: Vincennes,IN
Age: 25
Posts: 112
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I did the calculations and i need around 615cfm..but that doesn't mean anything..My best friend has basically the same setup and is running a 650 and runs good but might be able to go to a 750.
Setup is 9.5:1 compression 360-375(EST) chevy 357(.040).
Another thing is i am having trouble with finding an adapter from spread bore to square bore. All i can find is square bore to spread bore intake.The performer RPM airgap is a square bore intake so thats why i need it..If you have any other suggestions/carbs it would be appreciated.

-Eric
Reply With Quote
  #4 (permalink)  
Old 03-15-2004, 09:02 PM
poncho62's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Streetbeasts links
Last journal entry: at car show
Last photo:
Join Date: Oct 2003
Location: Hanover, Ontario, Canada
Age: 60
Posts: 16,320
Wiki Edits: 5

Thanks: 6
Thanked 108 Times in 85 Posts
Flip the adapter over.......................

Adapters are notorious for giving carb problems....should avoid them, if possible.
__________________
Ontario Rodders
Reply With Quote
  #5 (permalink)  
Old 03-16-2004, 02:44 PM
Erk Erk is offline
Member
 
Join Date: Feb 2004
Location: Vincennes,IN
Age: 25
Posts: 112
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I could avoid it by going with the 650 Double Pumper route which is square bore.I only have $150 to spend on a carb(rebuilt).

-Eric
Reply With Quote
  #6 (permalink)  
Old 03-16-2004, 05:07 PM
lluciano77's Avatar
Short changed on common sense
 
Last photo:
Join Date: Jun 2003
Location: california
Age: 36
Posts: 3,548
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Do not follow that formula. That formula does not work for performance vehicles.

I am sure you could run a vac. 750 or a 650 DP with no problems.
Reply With Quote
  #7 (permalink)  
Old 03-16-2004, 07:31 PM
rifraf's Avatar
Member
 
Join Date: Dec 2003
Location: washington
Posts: 576
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I would rather have one a little small over a mis match with a spacer,at least it would run good and have good response.
Reply With Quote
  #8 (permalink)  
Old 03-16-2004, 10:06 PM
lluciano77's Avatar
Short changed on common sense
 
Last photo:
Join Date: Jun 2003
Location: california
Age: 36
Posts: 3,548
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
If it is making 360 to 375 hp, a 650 CFM DP would be conservative.
Reply With Quote
  #9 (permalink)  
Old 03-16-2004, 10:35 PM
FiveFeezy's Avatar
Fishing poles in the hot rod!
 
Last photo:
Join Date: Mar 2004
Location: Richmond, CA
Posts: 109
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I would use the adapter as a temporary thing until you can get a good square-bore holley. I used an adapter once and my motor ran fine. But when I finally got a carburetor that didn't need an adapter the motor ran a lot better at the top.
Reply With Quote
  #10 (permalink)  
Old 03-18-2004, 04:52 AM
rifraf's Avatar
Member
 
Join Date: Dec 2003
Location: washington
Posts: 576
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Conservative puts your shoulders in the seat all the way threw,not just begging for a high rpm rush with an indecisive screwdriver. Adapters are indecisive.
Reply With Quote

Recent Engine posts with photos


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

Posting Rules
You may not post new threads
You may not 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 07:23 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.