Results 1 to 11 of 11

Thread: Cam suggestions for my build

  1. #1
    Registered User
    Member ID
    CZCC-30520
    Join Date
    Jun 2014
    Location
    Chilliwack BC Canada
    Age
    36
    Posts
    51

    Default Cam suggestions for my build

    Hi guys, I have a 72 240 with a 2.9 stroker. F54 flat top block and N42 head. Dual Z Therapy SU's with SM needles, nismo motorsport 6-2-1 header, 2.5 inch exhaust all the way, port matched intake and exhaust.

    its got a stock l28 cam in it however, and it falls on its face around 5500rpm, and has a nasty flat spot right around peak advance (3000rpm) that might have something to do with my static compression ratio from what I have read.

    I have also read that with my compression (should be over somewhere just over 10:1) i should be running a cam with somewhere in the neighborhood of 270-290 duration on this build.

    is this about right for this engine? and will i need better valve springs and lifters as well? or will the stock ones do the job?

    Also, i'm not sure if I need an oil bar, I believe my n42 is from a newer engine, so I will need a cam that is right for my head i believe. or does it matter what type of cam you use?

    I'm in the market for a cam as we speak, so if you have a combo that is suitable for the car, please let me know.

  2. #2

  3. #3
    Supporting Member Diseazd's Avatar
    Member ID
    CZCC-14126
    Join Date
    Mar 2007
    Location
    Richmond
    Posts
    1,852

    Default

    I agree.....Isky is the way to go.....have them regrind your camshaft to Stage III. The Datsun metals are compatable with other parts in the L series engine. I would suggest that you install new or remanufactured rockers and make sure you understand geometrying a camshaft (centering wipe patterns) with the rockers. Also remember to run Isky valve springs to allow for the extra lift, which requires the shorter valve seals. H.P. is expensive eh? IMO
    Last edited by Diseazd; 09-02-2014 at 06:22 AM.
    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

  4. #4
    Registered User
    Member ID
    CZCC-30520
    Join Date
    Jun 2014
    Location
    Chilliwack BC Canada
    Age
    36
    Posts
    51

    Default

    Looks like the Isky stage 2 or 3 cam is what i will want. coupled with springs and thicker lash pads.

    While i'm doing this i plan on having the head ported out more. I'll also replace the valve guides and seals (she smokes a bit on decel) so i'll just have the shop install all the replacement parts since the stock stuff will be removed anyway.

    Probably looking at about a grand for the job I'd imagine. but she should go like a raped ape after shes done.

  5. #5
    Registered User Jeff G 78's Avatar
    Member ID
    CZCC-7975
    Join Date
    Mar 2005
    Location
    Northville, Michigan
    Age
    53
    Posts
    1,895

    Default

    I run a Web Racing #91 grind cam and my 260's 2.8L pulls strong to 7k. They too know what they are doing and have been making Z cams for decades. My cam is a new billet, but they also sell regrinds. Bryan Little talks about the Web Cam on his site.

    Datsun Z Garage- ZCAR Performance Mods

    Web Cam Inc. - Performance and Racing Camshafts
    Jeff
    Northville, Michigan
    IZCC #1285
    '78 280 10:1 CR, Arizona Z Car header, urethane bushings, Tokico springs, Illumina struts, Panasports w/Hankook R-S2 225/50R16 tires, Maxima 105 amp alternator
    http://www.classiczcars.com/photopos...00&ppuser=7975
    '74 260Z BRE look-alike crap can for Optima Batteries ChumpCar World Series Racing racing
    https://www.facebook.com/Jeff.Grauer

  6. #6
    Registered User
    Member ID
    CZCC-15312
    Join Date
    Oct 2007
    Location
    Toronto, Canada
    Posts
    57

    Default

    I'am also running a Web Cams #91 re grind on my 10:1 L28. Very happy with it, pulls hard to 7k no problem.

  7. #7
    Registered User madkaw's Avatar
    Member ID
    CZCC-7622
    Join Date
    Dec 2004
    Location
    bloomington IN
    Age
    56
    Posts
    2,288

    Default

    I've run a Schneider cam with good results
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

  8. #8
    Registered User Jeff G 78's Avatar
    Member ID
    CZCC-7975
    Join Date
    Mar 2005
    Location
    Northville, Michigan
    Age
    53
    Posts
    1,895

    Default

    Quote Originally Posted by AlexS13 View Post
    I'am also running a Web Cams #91 re grind on my 10:1 L28. Very happy with it, pulls hard to 7k no problem.
    Alex, are you running L-Jet or carbs/aftermarket FI? I could not get my L28 L-Jet to run at all with a performance cam. I went back to the OE cam in that car and used the Web cam in my L28 SU car. It runs great with SU's.
    Jeff
    Northville, Michigan
    IZCC #1285
    '78 280 10:1 CR, Arizona Z Car header, urethane bushings, Tokico springs, Illumina struts, Panasports w/Hankook R-S2 225/50R16 tires, Maxima 105 amp alternator
    http://www.classiczcars.com/photopos...00&ppuser=7975
    '74 260Z BRE look-alike crap can for Optima Batteries ChumpCar World Series Racing racing
    https://www.facebook.com/Jeff.Grauer

  9. #9
    Registered User siteunseen's Avatar
    Member ID
    CZCC-24724
    Join Date
    Jul 2011
    Location
    Alabama
    Posts
    1,967

    Default

    Does their #91 grind require new springs and shorter valve stem seals?

    Thanks!
    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

  10. #10
    Supporting Member Diseazd's Avatar
    Member ID
    CZCC-14126
    Join Date
    Mar 2007
    Location
    Richmond
    Posts
    1,852

    Default

    I've heard, anything over .460 lift requires new springs to prevent stacking. Dave Rebello sells an outter spring that can be used with a stock inner spring that allows up to .500 lift. You can use the stock retainers with up to a .210 lash pad according to him. I like the Isky Valve Springs, but in the early heads, you need to use a shorter valve seal to prevent contact with the bottom of the retainer (not good).
    siteunseen likes this.
    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

  11. #11
    Registered User
    Member ID
    CZCC-15312
    Join Date
    Oct 2007
    Location
    Toronto, Canada
    Posts
    57

    Default

    Jeff, I'm running SU's on my L28.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Need some suggestions
    By Jonu in forum Help Me !!
    Replies: 8
    Last Post: 03-26-2012, 06:08 PM
  2. Need some suggestions.
    By shelbyhestla in forum Exhaust (S30)
    Replies: 1
    Last Post: 09-03-2010, 10:13 AM
  3. Exhaust Suggestions?
    By ZohanIsBack in forum Exhaust (S30)
    Replies: 3
    Last Post: 08-20-2010, 12:57 AM
  4. Suggestions, Anyone ???
    By 1 Bravo 6 in forum Open Discussions
    Replies: 18
    Last Post: 04-10-2005, 03:07 AM
  5. New Cam suggestions
    By seerex in forum Engine and Drivetrain (S30)
    Replies: 2
    Last Post: 12-04-2003, 12:21 PM

Bookmarks

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
  •