Page 1 of 2 1 2 LastLast
Results 1 to 10 of 12
  1. #1
    pedro15's Avatar
    Join Date
    Jul 2014
    Location
    SW florida
    Posts
    159
    +1
    9

    Camshaft question

    My friend got a crt cam and the engine on idle has a vacuum of -1 to -2 when the normal vacuum should be -7 to -8 and its throwing a air pressure code as a result.

    First question; is it normal for a regrind cam to have those numbers of vacuum when idle?

    Second question; if it shouldn't, could be just a case of a bad regrind job?

    Any input will help, thanks


  2. #2
    Greggpru's Avatar
    Join Date
    Sep 2015
    Location
    Nj
    Posts
    1,516
    +1
    133
    Double check cam timing .

  3. #3
    Eastside Powersports Slow 91's Avatar
    Join Date
    Sep 2008
    Location
    River Crew CT
    Posts
    4,296
    +1
    556
    shouldn't CRT know the answers to your questions?

    What are their cam specs? also how did you setup the timing?

  4. #4
    pedro15's Avatar
    Join Date
    Jul 2014
    Location
    SW florida
    Posts
    159
    +1
    9
    we ask carlito but it was a lost cost, the guy its impossible to reach. the cam timing was first set to factory, then we advance it and retarded it with the same results. when i get a chance i will measure the cam specs. Hey chris with your cam the vacuum at idle is normal -7 to -8?

  5. #5
    Greggpru's Avatar
    Join Date
    Sep 2015
    Location
    Nj
    Posts
    1,516
    +1
    133
    My stage 2 is -7to8

  6. #6
    pedro15's Avatar
    Join Date
    Jul 2014
    Location
    SW florida
    Posts
    159
    +1
    9
    Greg do u know if your cam is just lightweight with the same lift or it has bigger lift?

  7. #7
    Greggpru's Avatar
    Join Date
    Sep 2015
    Location
    Nj
    Posts
    1,516
    +1
    133
    Lift is .426

  8. #8
    Greggpru's Avatar
    Join Date
    Sep 2015
    Location
    Nj
    Posts
    1,516
    +1
    133
    .425 lift 276 dur IN. .416 LIFT 272 DUR. EXT

  9. #9
    Sanfish's Avatar
    Join Date
    Jun 2014
    Location
    S/E Florida
    Posts
    2,540
    +1
    780
    Quote Originally Posted by pedro15 View Post
    Hey chris with your cam the vacuum at idle is normal -7 to -8?
    I am running his cam and can tell you my idle is smooth and after playing with fuel cells between 1.8K to 3.5K, its butter smooth.

    While I have no idea what the specs of that CRT cam is, the CRT cam sounds like it has too narrow of a lobe separation. While that's great for N/A motors (or those that prefer that lumpy big cam "sound"), its not ideal for boosted applications...which prefer a wider lobe angle.

    Does the engine sound very lumpy? (potato, potato, potato)

  10. #10
    pedro15's Avatar
    Join Date
    Jul 2014
    Location
    SW florida
    Posts
    159
    +1
    9
    Yea it has that big cam sound. I will messure the cam and i will post it later

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Camshaft interchangeable question
    By elviswongg in forum Kawasaki PWC Performance (4-stroke)
    Replies: 4
    Last Post: 10-08-2009, 07:39 PM
  2. RXT handling question
    By MPower in forum 4-Tec Performance
    Replies: 5
    Last Post: 08-11-2009, 10:04 AM
  3. 158 Thermostat question...
    By rx4pain in forum 4-Tec Performance
    Replies: 34
    Last Post: 11-21-2008, 10:36 PM
  4. Question for the Hulk
    By Therock in forum 4-Tec Performance
    Replies: 3
    Last Post: 05-20-2005, 07:13 AM
  5. RXP VTS Question
    By 1FastTrespiper in forum 4-Tec Performance
    Replies: 4
    Last Post: 05-08-2005, 10:53 PM

Posting Permissions

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