Results 1 to 3 of 3

cam confusion

This is a discussion on cam confusion within the Internal Engine forums, part of the LSx Technical Help Section category; i dont understand the cam numbers what do they mean...

  1. #1
    Junior Member
    Join Date
    Apr 2008
    Location
    Broken Arrow
    Posts
    51

    white
    95 f-150

    cam confusion

    i dont understand the cam numbers what do they mean

  2. #2
    Track Whore 570SX's Avatar
    Join Date
    Jul 2008
    Location
    Central Florida
    Age
    32
    Posts
    63
    1989 Nissan 570SX

    you'll find more info if you go to a major cam manufacturer's website, i.e. Comp Cams or something.

    basically there's:
    advertised duration, measured in degrees: theoretically how long the valve is seeing a force exerted on it by the cam. not particularly relevant to anything, but you can still compare cams against each other based on this number. degrees are of crankshaft rotation.
    maximum lift, measured in inches at the valve (or mm if you're looking at imports): the most the valve opens at any point
    duration @ 0.05" lift: how long the valve is at open at least 0.05". much more indicative of actual duration. interestingly, the closer this number is to the advertised duration, the quicker the cam is ramping up to max lift, which is a good indication of how harsh the cam will be on the valvetrain components.

    for any of these things, larger numbers generally mean more power in the top end, with sacrifice of low end. read up on a cam manufacturers' websites for more in-depth coverage.

    there's also lobe separation, measured in crankshaft degrees as well. for this, the lower the number, the more lopey the sound, and it will drastically affect the difference between top end and low end/midrange power. a few degrees less separation can make a cam come alive at 5000rpm instead of 3000rpm.

    check this out for some reading:
    http://www.cranecams.com/?show=productNews
    scroll to the bottom and start reading.
    ~Jason
    2005 Acura RSX: Daily Driver duties
    1994 Toyota Corolla: the beater that just won't die!
    "Fast, Cheap, Reliable. You can only have two."

  3. #3
    Member chieftransam's Avatar
    Join Date
    Nov 2006
    Location
    Germany
    Posts
    382

    Blue
    2001 Pontiac Trans Am M6


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Lowering Confusion
    By wicked1 in forum Suspension and Handling
    Replies: 5
    Last Post: 11-16-2011, 02:05 PM
  2. Question: Muffler Confusion
    By camaroluvr447 in forum External Engine
    Replies: 17
    Last Post: 03-12-2011, 01:35 AM
  3. Confusion: HID for T/A
    By BashamWS6 in forum Appearance Section
    Replies: 7
    Last Post: 11-22-2010, 09:42 AM
  4. 98 4l60e confusion
    By dfdexplorer1166 in forum Automatic Transmission
    Replies: 6
    Last Post: 06-25-2006, 06:20 PM
  5. tire confusion
    By baseballss in forum Wheels and Tires
    Replies: 12
    Last Post: 06-07-2006, 01:01 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •