eccelorator pump cams - 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 08-10-2002, 11:25 PM
E.T. divided by $ spent= Speed
Last photo:
Join Date: May 2002
Location: NYS america's unwiped butt
Age: 36
Posts: 1,858
Wiki Edits: 0

Thanks: 0
Thanked 5 Times in 5 Posts
Post eccelorator pump cams

I'm thinkin bout experamenting w/ eccelerator pump cams.I have a 600 vac sec 1850s holley.I rebuilt it w/ a better pump dia.(I believe 50cc).The car ocasionaly has a slight bog from off idle.I'm all so looking for a snapier rev.
My question is:is there a starting point to these or do I just expeirament???
Also I don't remember what power valve I've got in.Should I start by matching my power valve to my vac. signel befor I play w/ pump cams???

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 08-11-2002, 01:37 AM
4 Jaw Chuck's Avatar Moderator
Last photo:
Join Date: Mar 2002
Location: Manitoba, Canada
Age: 47
Posts: 5,504
Wiki Edits: 0

Thanks: 21
Thanked 274 Times in 186 Posts

Whoaaaaa there big guy, change one thing at a time. The brown cam is pretty well what I use on every engine I have built, I just wish they sold it seperately. I have to buy the whole darn kit just to get it, I must have 5 each of all the other colors. You can experiment but I always come back to brown. Black is standard.

If you have a bog check for zero clearance at the accelerator pump lever, the cam should start shooting gas as soon as the throttle moves...even a little bit. There will only be one hole position which will work well, can't remember which hole it is #1 or #2. Experiment and you will know immediately. Make sure there is 0.015-0.020" clearance at the override spring at WOT, you don't want to bottom the pump.

Once you have that sorted out you can play with power valves, I always use a valve that opens at 1 inch of mercury below what I see on a vacuum gauge at light part throttle (cruise), on mild cammed engines this is almost invariably a 65 valve. If you have a wicked 300 degree duration cam and open plane manifold with a big carb and big heads you might need to drop down to a 30. Factory stock engines usually use an 85 or 75.

If you can't get rid of the bog using these mods you might need a bigger shooter. The list of changes you can make is endless, just make sure you do one thing at a time. <img src="graemlins/nono.gif" border="0" alt="[nono]" />
Outlawed tunes from outlawed pipes
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-11-2002, 07:17 AM
dmorris1200's Avatar
doesn't play well with others
Last photo:
Join Date: Feb 2002
Location: Maine
Age: 50
Posts: 1,834
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post

There's some good info at holleys tech support website about this stuff.
<a href="" target="_blank"></a>

You can go to <a href="" target="_blank"></a> and navagate through their tech support, there's some neat info. there.

Keep in mind even ignition timing being off could cause a hesitation off idle, it is a shame, like chuck said, that you have to spend $100.00 for a whole kit when you only need one pump cam.

[ August 11, 2002: Message edited by: dmorris1200 ]</p>
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-11-2002, 08:04 AM's Avatar Moderator
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto...
Last journal entry: How to change auto shift timing on 200R4
Last photo:
Join Date: May 2002
Location: Bakersfield
Posts: 8,398
Wiki Edits: 21

Thanks: 1
Thanked 13 Times in 11 Posts

In my experience, 4-jaws advice about setting the cam to squirt immediately is the key. there should be 0-clearance (set it with 1 or 2 1000's of initial stroke at rest).
Reply With Quote Quick reply to this message

Recent Engine posts with photos
Gear in this thread - Powered by O'Reilly Auto Parts

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

All times are GMT -6. The time now is 12:49 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright 1999 - 2012. All Rights Reserved.