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spawn of 225 swap thread

Discussion in 'Early CJ5 and CJ6 Tech' started by madmax79, Jul 27, 2004.

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  1. Jul 27, 2004
    madmax79

    madmax79 New Member

    St. Augustine,...
    Joined:
    Jul 23, 2004
    Messages:
    32
    OK. Everyone knows more power is good and if a motor is shot, why not replace it with a newer more powerful motor. That being said, convince me that the F-head 134 (which is in perfect shape) in my '67 CJ5 is really trail worthy and explain the "Tellico Tested" F-heads and what mods they have.

    My goal is to have a good trail rig that won't need help through the hard stuff. Restoration is already out of the question for me since that's not my style.
     
    madmax79, Jul 27, 2004
    #1
  2. Jul 27, 2004
    vanguard

    vanguard

    A picture is worth a thousand words :hurrican:

    [​IMG]
     
    vanguard, Jul 27, 2004
    #2
  3. Jul 27, 2004
    vanguard

    vanguard

    My CJ5 is currently powered by a F-head and did well up at big bear in a stock configuration with the sole exception of a solex carb. I did however have to flat tow up to Big Bear, but on the trails Betsy ran fine.

    Here's a link to some of the common F-head mods:

    http://www.film.queensu.ca/CJ3B/Tech/KamunenEngine.html

    Common upgrades include the weber (or solex) carbs, pertronix ignition modules and clifford performance headers.
     
    vanguard, Jul 27, 2004
    #3
  4. Jul 27, 2004
    John A. Shows

    John A. Shows Comic Relief

    Mendenhall...
    Joined:
    Sep 24, 2002
    Messages:
    938
    After driving Scott Klecka's 60 with the F-Head I'd say there's absolutely nothing wrong with the F-Head and I run the V6.

    I may have more power than the F-Head but heck fire!...I never use it.

    I can do exactly what I do now with a 4 cylinder as long as the gears are right.

    I run 3.73's so there may be difference with my gearing but considering most are in the 4's at least and some in the 5's a Briggs and Straton would probably be sufficient.
     
    John A. Shows, Jul 27, 2004
    #4
  5. Jul 27, 2004
    michigan_pinstripes

    michigan_pinstripes I'm not lost, I'm wandering

    Clarkston MI...
    Joined:
    Aug 20, 2003
    Messages:
    605
    For some reason I sense some F-134 dyno curve charts in this thread's future --not sure why I think this. :D
     
    michigan_pinstripes, Jul 27, 2004
    #5
  6. Jul 27, 2004
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
    Messages:
    3,437
    I've seen the advantage go to the V6 on long hills, especially where the base is fairly loose and wheelspin is needed clean up to the top. In those cases, the 4-banger guys just plain run out of motor. :(
    However, 90% + of the time, a good running Hurricane will do as well as the V6 on most trails.

    The other weakness of the Hurricane is highway driving, but that can be overcome with the right combination of tire size, gearing and overdrive.
     
    lynn, Jul 27, 2004
    #6
  7. Jul 27, 2004
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    What Lynn said, having the CJ-5 on the trail at Attica in the pea gravel it just didn't have the ooommphh to make it up the steep hills but on the normal trails it was fine.
     
    sparky, Jul 27, 2004
    #7
  8. Jul 27, 2004
    madmax79

    madmax79 New Member

    St. Augustine,...
    Joined:
    Jul 23, 2004
    Messages:
    32
    How about low speed stuff like clearing rocks, logs and other obstacles??? Obviously it wouldn't be an "extreme" rock crawler, but I've seen plenty of trails with things just in the way.
     
    madmax79, Jul 27, 2004
    #8
  9. Jul 27, 2004
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
    Joined:
    Sep 20, 2002
    Messages:
    4,350
    Welp Animal is Tellico tested x 2!!!!
    Even pulled a certain Red CJ6 off some rocks......(if the owner would remember to use reverse that is).

    Seems gud to me!
     
    blevisay, Jul 27, 2004
    #9
  10. Jul 27, 2004
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
    Messages:
    3,437
    For low speed crawling, the F-head is as good as the V6, since the key is in the gearing. In fact, in factory configuration, the gearing was usually better on the f-head rigs than the common 3.73s (standard equipment) on the V6 rigs
     
    lynn, Jul 27, 2004
    #10
  11. Jul 27, 2004
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
    Joined:
    Sep 20, 2002
    Messages:
    4,350
    [​IMG]

    :hurrican: :hurrican: :hurrican: :hurrican:
     
    blevisay, Jul 27, 2004
    #11
  12. Jul 27, 2004
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
    Joined:
    Dec 22, 2002
    Messages:
    4,422
    I wondered when that picture was coming out bill :D
    Yea, with the F head, 5.38 to 1 gearing, and a little lift, it'll go over just about anything that doesn't tip it over. The other thing that me and Bill had going for us at tellico was the narrow wheel base. We could sneek thru stuff other wider vehicles had to go over. Put the overdrive on and you can not only get a higher gear, but you can split your gears esentially giving you a 12 speed rig. the perfect gearing will be there somewhere...

    If the engine is in good shape, I wouldnt' worry about it much. Mine is about had it, and I'm planning on dropping another F head in its place. I'm running the pertronix, which helps alot, and the solex carb wich is also pretty nice. May just be though that its new and not worn out like the old carter I had.
     
    termin8ed, Jul 27, 2004
    #12
  13. Jul 27, 2004
    xz3ltt

    xz3ltt I love hockey mom's

    Clarkston, MI
    Joined:
    Apr 3, 2004
    Messages:
    96
    Lots of discussion about the "F" head. What about the "L" head? Same thoughts??
     
    xz3ltt, Jul 27, 2004
    #13
  14. Jul 27, 2004
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
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    Yes.

    Drove a 2A around w/ 7x16 NDTs through the woods places a built EB on 35's wouldn't and couldn't go and had more fun doing it. :D
     
    sparky, Jul 27, 2004
    #14
  15. Jul 27, 2004
    Boyink

    Boyink Super Moderator Staff Member

    Tulsa, OK
    Joined:
    Sep 20, 2002
    Messages:
    6,197
    Max this is one of those questions where the ECJ5.com board seems to differ...;) Most sites you'd get a "no substitute for HP" response.

    But there's a ton of fun to be had with your Jeep in relatively stock form, or with a few additions like lockers or a granny low 4 speed swap.

    My view has always been to go see what it can't do before modifying it. The magazines and internet Jeeping community have done a good job of convincing people they need way more Jeep than what this group has seen on the trail.
     
    Boyink, Jul 27, 2004
    #15
  16. Jul 27, 2004
    michigan_pinstripes

    michigan_pinstripes I'm not lost, I'm wandering

    Clarkston MI...
    Joined:
    Aug 20, 2003
    Messages:
    605
    What Mike Says......

    I could never figure out the V-8 CJ's -- real heavy. I think it was a misconception but people liked having it and it sounded cool (I like the sound too!)

    I found that Putt Putt won't race up the dunes but it will crawl over anything on the trail.

    I think 4.xx or 5.xx gears with a V-6 would be the best choice unless you commuted with it. The 3.73 was good on the road and good off road-- not stellar. And like Baby John stated, a Briggs and Stratton would be sufficient with 5.38's!!

    However --- 3.73 is preferred at 10# of [​IMG] boost :twisted:
     
    michigan_pinstripes, Jul 27, 2004
    #16
  17. Jul 27, 2004
    blevisay

    blevisay Oh Noooooooooooooooo! Staff Member

    Portland Tn.
    Joined:
    Sep 20, 2002
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    4,350
    But there's a ton of fun to be had with your Jeep in relatively stock form, or with a few additions like lockers or a granny low 4 speed swap.

    My view has always been to go see what it can't do before modifying it.



    WERD! :hurrican:
     
    blevisay, Jul 27, 2004
    #17
  18. Jul 27, 2004
    Kodiak12060

    Kodiak12060 Sponsor

    Beacon NY
    Joined:
    Sep 27, 2002
    Messages:
    465
    My friend has been crawling for many years. He has a flat fender w/ L head, hand-throttle on the stickshift, powersteering and a flanged 44 rear w/ locker. Don't know if he has anything locked in front. He says he passes those guys w/ the V8's as they break stuff on the trail. His jeep is light, not overpowered and simple. He says don't go w/ anything over 33's for tires and you are good to go. It's better to be wheelin than wrenching and spending all your money on replacement parts.
     
    Kodiak12060, Jul 27, 2004
    #18
  19. Jul 27, 2004
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
    Joined:
    Sep 10, 2003
    Messages:
    2,084
    Trail Sleepers Rule!
     
    66cj5, Jul 27, 2004
    #19
  20. Jul 27, 2004
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
    Messages:
    5,470
    We ran the 4 bangers for years till we found the V6's. Our main reasons to convert:
    Mts - we have alot of steep long climbs with loose holes in them to get to the good fishin and elk
    Snow - chained up it helps to keep the wheel spin up to move through deep snow (over the hood type stuff during elk season)
    Road Speed - with the 4.88's and 5.38's the OD and the V6 makes it so we can go on the highway and not be a hazzard.

    I don't use tires over 31" - skill and not HP gets us up trails like Holy Cross.

    I don't like the V8's - need to many revs and beats the gear to death.

    Like it's been said - only swap if you have a need to.

    :stout:
     
    Warloch, Jul 27, 2004
    #20
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