2F engine not powerful enough???

Discussion in '40- & 55-Series Tech' started by VictoryRed, Feb 9, 2009.

  1. VictoryRed

    VictoryRed

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    :crybaby:I just bought a 1978 fj40 but for some reason the beast won't go above 60 on the road. I have 33's on the frame and it is the original 2F with only about 125K original miles on it. It sounds great but I am not getting enough torque out of it. The only thing I can think of is that it is set up to pass emissions in AZ but I am now in NM and that is not required. Do you guys think this is the problem? I have a new carb, new tune up, new fuel pump, etc and it seems to run good but just cant get more power from it? Any ideas?? Please help.:crybaby:
     
  2. Hallmark

    Hallmark

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    2F

    Welcome to Mudd :flipoff2:

    If you like driving a LC well as many others have said, learn to love the right lane. I do, if you want something that goes fast, then buy it....

    Good Luck:)
     
  3. amaurer

    amaurer

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    pfft, you should be able to break 60 easily with a 2F.
     
  4. Josie'sLandCruiser

    Josie'sLandCruiser Stop calling it a "FJ."

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    Hi All:

    Well, if the rig has all of its original smog-junk on it the 2F is probably only putting out about 125 HP.

    Things to check are the compression of the engine, and whether you have the appropriate jets in the carb for the altitude you are driving at.

    The '78 vintage 2F in my '74 FJ40 pulls pretty good on the highway but admittedly it bogs down a bit when pulling a mountain pass (3,000 feet elevation) between the resistance of the grade of the road and the carb jets set for sea level.

    But, if you really need a lot more power a GM V-8 is the "tried and true" solution. Do some searching here on MUD - lots of good info on doing a SBC swap.

    Good luck!

    Alan
     
  5. DSRTRDR

    DSRTRDR I can mangle anything ... SILVER Star

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    what's the gearing in your axles ?

    how do you know you are low on torque :confused: did you want torque or power ?

    yes, the 2F will go faster than 60 - not that that is necessarily safe :rolleyes:
     
  6. thetaxmonkey

    thetaxmonkey

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    I would check compression first
     
  7. Lil'John

    Lil'John SILVER Star

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    Check compression.

    Also check gear ratio.

    My 2F pulled 31s with 4.11 gears to 65mph+ with no problems and would maintain 55-60 going up the hills around Sacramento.

    The moment it lost compression, it had problems.

    My 2F had a smog legal header and Malory unilite distributor but no other "performance" mods that I know of
     
  8. Trollhole

    Trollhole THC Supporting Vendor Moderator

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    Is it pretty much stock?

    Have you done a compression test?

    Is the linkage bound in any way? Will it go wide open?

    What are your rpms at 60?

    Could always cap off the smog pump temporarely if you think it might be the issue.

    Could it have been detuned to meet emissions?

    What is the timing set at.

    Is the advance working?

    Is the pedal all the way to the floor?

    What psi are your tires?

    No brakes are dragging, right?

    Choke is working correctly?

    I can go on all night.:D Cause you don't need a v-8 to have a powerfull cruiser. All you need is to have a good running 2f.
     
  9. Cruiserdrew

    Cruiserdrew On the way there SILVER Star

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    There is something badly wrong! My guess is that the carb secondary is not opening or the distributor advance is not working. My 2F will take my spring over FJ60 to 75 easy.
     
  10. boysrus

    boysrus

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    Something's not right. I run a 78 with 33's (4.10's) at 6,000 ft and can run over 60. On a good day I can even pass a slow truck!

    Anyway, it's no powerhouse, but it should do better than you're describing.

    I agree with the compression check - as well as the other basics: valve lash, timing, carb set-up (is the secondary working???).
     
  11. FineWynsFJ40

    FineWynsFJ40 Eff-Jay-Farty

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    My question is who the hell goes above 60 with an original engine in their truck? It's not the safest thing, nor is it the best for engine and fuel efficiency. I'm good with right around 52-55. Where did I read that 100 km/hr or 62 mph was the top end? Factory literature somewhere, I think.

    Brian
     
  12. fj404life

    fj404life

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    80mph:steer:
    69 fj ad.jpg
     
    Last edited: Feb 10, 2009
  13. 65swb45

    65swb45 Elder Statesman Supporting Vendor

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    My thoughts as well. Check carb linkage for excessive freeplay, and try the secondary diaphram test [thread search required;)]

    Best

    Mark A.
     
  14. malcb

    malcb

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    I like the advert but "deep foam seating for seven men" - not for long in an FJ40 please!

    That also says 145bhp which I think is right for a new '78, 125bhp for a F? (not sure because the picture is pre 2F). 2F might be 155bhp?

    Even a good engine will be down on new spec after whatever years since it was new or had a rebuild but I would guess 100bhp should see you at 65mph in most FJ40's.
     
  15. Aussie FJ40

    Aussie FJ40

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    if you check what Trollhole suggests you wont be far from the problem,if it is so sick it wont be hard to figure the problem,my 77 kicks ass,its stock and will do the 80mph they say but i crooze on 60,just done 4000 kilometres no drama, its part of the fun of getting to know your rig too,let us know when its sorted
     
  16. WES1977

    WES1977

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    I do believe I can do 80 with my 33 on my 40

    [​IMG]

    http://www.matlca.com/Photos/1964_MT_FJ45LV_review-6.jpg
     
  17. Weedhopper

    Weedhopper SILVER Star

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    Mine runs like a top and 50-55 is the best it will comfortably do. I could make the engine scream and get more speed if I wanted to... and then slam a tree...:eek: I think he has a pretty normal 78, but was expecting more.
     
  18. WES1977

    WES1977

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    He's saying his top speed is 60 and he has pretty much the same vehicle as I do and I cruise at 60 no problem. Something is not right. I don't have smog equipment but I have the tires and the motor he has.

    Does the 78 have points?
     
    Last edited: Feb 10, 2009
  19. motoloco

    motoloco

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    I drive mine on 35's (4:88's) at 65-70 at 7000', 50-55 up steep grades. There is somthing wrong if it wont go 60mph on flat ground at sea level. Try fresh fuel, basline all the fluids and tune up. And check your vac advance. Also remeber with 33's and stock 4:10's 60mph on the speedo will be closer to 70mph.
     
    Last edited: Feb 10, 2009
  20. Robert LaDuke

    Robert LaDuke

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    Mine's a '78 on 33's..... 2F motor with all the smog crap. cruises at 65 with no problem. Haven't tried to go faster but could.

    Maybe start with a tune-up. Valve adjust.
     
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