Understanding Cam Specs a bit more. - 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 01-10-2008, 08:36 AM
Farmer Buck
 
Join Date: Sep 2007
Location: West Virginia
Age: 72
Posts: 49
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Understanding Cam Specs a bit more.

Hey, Big time Cam Guys!!! (Not to be confused with "Big time Car Girls" +GRIN+ )---You folks have helped me in sorting out cam info, and I've bought the cam I wanted for my project through your help.

As I've went through countless books and catalogues on different cams I'm still somewhat confused on how to read some of the information. Maybe you could straiten me out.

Trying to understand how Duration is listed. Some cams list duration at .050", example 207/213. ---Some list Duration as "advanced" and usually have one figure, such as 266 degrees. --Some listings just list Duration, and give one figure, I suppose there is some settled upon standard? --I don't know how to compare the figures, and I don't know what the two figures are ie: 207/213. (When I bought my cam from Summit, the teck told me it was 210 duration. I don't know how that compares with two figure stuff, and "advanced" vs .050". )

On one of my vehicles, a 91 F150 Ford, the speck sheet lists duration info as INTAKE Closed 72/82 INTAKE open 196/212. And EXHAUST Closed 76/84, EXHAUST Open 190/210. ----If I'm to compare this information with the ONE figure stuff like the Summit teck does, What would be that duration? And how do you arrive at it?

This is not a world shaking problem at all: Just an interest one. I'd like to be better able to know and understand what I'm reading.

Thanks folks! Appreciate your time!

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-10-2008, 12:31 PM
richard stewart 3rd's Avatar
Registered User
 

Last journal entry: 351W rebuild
Last photo:
Join Date: Jan 2006
Location: tremont, pa.
Age: 70
Posts: 2,218
Wiki Edits: 0

Thanks: 14
Thanked 15 Times in 14 Posts
Hi F-Bird & Lloyd,
That was a good article F-Bird, but like most of the stuff
written in the mags, they don't go far enough, they
leave you hanging wanting & sometimes needing
more information, I realize the information is on the
net, but if I payed the $6. for a mag., I'd want all the
info on that subject.
Take care,
rich
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-10-2008, 01:17 PM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: Found an LQ9 today
Last photo:
Join Date: Dec 2005
Location: Carlisle, PA
Age: 41
Posts: 5,319
Wiki Edits: 16

Thanks: 20
Thanked 26 Times in 20 Posts
You have to understand that some of the angles are measured in crank degrees and some are in cam degrees. Since the cam rotates at half the speed it gets confusing. Once you figure it out, its simple math.

The only "standard" is the @ .050 measurement. Some companies do their "advertised" at .002 lift, some at .004, some at .006. Although they're all different, as long as you know where its measured they're all important numbers.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-10-2008, 03:08 PM
malc's Avatar
Living At The Speed Of Life
 
Last photo:
Join Date: Jun 2003
Location: Espaņa Right Coast
Posts: 3,323
Wiki Edits: 0

Thanks: 121
Thanked 162 Times in 133 Posts
Understanding Camshafts at CHP.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-11-2008, 03:06 AM
malc's Avatar
Living At The Speed Of Life
 
Last photo:
Join Date: Jun 2003
Location: Espaņa Right Coast
Posts: 3,323
Wiki Edits: 0

Thanks: 121
Thanked 162 Times in 133 Posts
Seems like I goofed.
Posted a link that was previously posted.
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:
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
cam shaft specs azza250 Engine 2 12-05-2003 12:01 AM
L88 cam specs Tiros Engine 1 11-03-2003 12:52 PM
IGNITION and CAM TIMING sum87mustang Engine 3 07-11-2003 08:52 PM
Anyone know the stock cam specs from a '73 Ford 302? 66StangBoy Engine 10 11-23-2002 07:06 PM
Cam Specs 66chevy2ss Engine 3 09-12-2002 03:40 PM


All times are GMT -6. The time now is 12:13 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.