Top speed of an L-head 134

Discussion in 'Flat Fender Tech' started by Old Doug, Jan 24, 2012.

  1. Feb 22, 2012
    nickmil

    nickmil Super Moderator Staff Member Sponsor

    Happy Valley, OR
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    Re: Yop speed of an L-head 134

    You can do the same with the F-head, and you can port the intake and runners. I'm still not understanding how you can get more power out of the flat head than the F-head.
     
  2. Feb 22, 2012
    garage gnome

    garage gnome Rust polisher Sponsor

    Western MA
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    Re: Yop speed of an L-head 134

    There is also a 2bbl carb kit available. I think it fits both the L and F heads. A company also makes a header for the L and F heads.
     
  3. Feb 22, 2012
    strvger

    strvger Member

    arrowhead of...
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    Re: Yop speed of an L-head 134

    who makes the headers? i already have the 2bbl and intake manifold for my f head. not sure it would be worth putting it on without headers.
     
  4. Feb 22, 2012
    garage gnome

    garage gnome Rust polisher Sponsor

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  5. Feb 22, 2012
    nickmil

    nickmil Super Moderator Staff Member Sponsor

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    To pare it down, Clifford Performance. Their motto is 6=8. They do a lot with and for 6 and 4 cylinder engines.


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  6. Feb 23, 2012
    duffer

    duffer Rodent Power Sponsor

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    Re: Yop speed of an L-head 134

    And they dream a lot and smoke funny cigarettes? Yes, there are a number of avenues for bumping the power in 134's (and other generally low performance engines), small bumps that cost increasingly large sums for returns on investment. Even if you could double the torque in a F head, a bone stock sbc of just about any displacement would tear it in half.
     
  7. Feb 23, 2012
    nickmil

    nickmil Super Moderator Staff Member Sponsor

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    My point was that Clifford was the company that was shown in the link and that they offered performance parts for 4 and 6 cylinder engines that few if any other companies offer. Not that an F or L head would equal a V-8.


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  8. Feb 24, 2012
    strvger

    strvger Member

    arrowhead of...
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    Re: Yop speed of an L-head 134

    thanks for the link. got a lot going on now, but maybe later this summer, i'll find an extra $350+ for them.
     
  9. Mar 1, 2012
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    Re: Yop speed of an L-head 134

    Because back in the day companies were making racing heads and carbs and even intakes for the Willys 4banger.
    They still show up on Ebay every once in a while.
     
  10. Mar 1, 2012
    nickmil

    nickmil Super Moderator Staff Member Sponsor

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    But the intake flow of the F head is and always will be more efficient than the L head. Even with the aftermarket parts available "back in the day" for the L head.
    Can't change basic physics.


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  11. Mar 4, 2012
    1960willyscj5

    1960willyscj5 Well-Known Member

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    The problem with the F-Head vs the flathead is you are stuck with that single intake spot for mounting a 1 or 2 barrel carb.
    With the flathead you could mount one, two or four carbs, and there were manifold readily available for doing so.
    Wasn't unusual for a flathead four to have the same horsepower and torque as an inline six.
    And with the sparkplug centered over the piston, you could weld in most of that area, leaving a small chamber for the air/fuel mixture, raising the compression ratio and the horsepower. Which they did do!
     
  12. Mar 4, 2012
    mikec4193

    mikec4193 Jeepless for first time since 2007....

    Mechanicville ny
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    Hi Everyone,
    I gotta ask a stupid question here. Why would anybody wanna get an early model jeep up to these kinds of speeds anyway??...I have never had mine (1965 CJ5) out of second gear (plow Jeep) and my 1960 Willys truck I have never gotten out of second gear either (lawn ornament type truck) but I have to tell you compared to my daily driver ('99 S10 truck). These old vehicles are not safe and appear to be a handfull to drive. I would if it were me just drive on secondary roads. It is an old vehicle...like anything old..it is gotta be driven slow.
    Just my 2 cents
    MikeC
     
  13. Mar 4, 2012
    garage gnome

    garage gnome Rust polisher Sponsor

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    They are safe, if you drive smartly. You just gotta anticipate other peoples moves and be aware of everything. I've driven my '53 on 200 mile round trips and it is perfectly fine. This year, I might even be taking it down to PA for the willys picnic. I guess it takes more thinking to drive a classic vehicle on modern roads than modern vehicles. But yeah, I wouldn't want to go past 60-65 with my jeep.
     
  14. Mar 4, 2012
    JeepPower

    JeepPower Hopeless Gearhead

    Fort Mill, SC
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    My F-head is driven daily at 55MPH. it is always nice to have a few more ponies.

    It is a blast to drive. I look forward to the ride to & from work!
     
  15. Mar 4, 2012
    jwjeep60

    jwjeep60 in process

    Sedalia Mo.
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    another advantage for the flattop is the lack of valvetrain, a 2" intake sure does sound good but it is the same mass as a mopar bigblock valve and most of it is setting in the exhaust passage, not over the piston.
    with that massive valve and a 12" long pushrod, valve float is a problem, and bigger springs won't do any good if the pushrod wants to fold under the pressure... of course you want to say beef up the rod but that just makes the valvetrain mass issue worse,
    if the flat head has valve float you can use the stiffest spring and fastest ramp you dare,
    and large valves don't always flow better, they just get shrouded and in the way as the air must go farther around it
    the air in the flat head is already making a 90* turn through the valve so just direct it to the piston, without blocking it.

    but you still can't do much with that 2lb connecting rod, or the 3 mains,
    but look into the flathead ford stuff for ideas, they have most of the same problems.

    fastest i got the F-134 was 65mph, and it took a while to get there, but i blame a stiff tailwind, 65psi in the 8pyl tires, some 93 octane (almost empty gotta cut that weight), a holley carb, and mild insanity. the good news is you can't get a speeding ticket, (even if you try)
     
    Last edited: Mar 4, 2012
  16. Mar 4, 2012
    1960willyscj5

    1960willyscj5 Well-Known Member

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    No, see, you have that the other way around.
    The S-10 is the unsafe vehicle, because it allows you to go so fast.
    Ya gots to slow down and enjoy the scenery, don't you know!

    Smell the Roses, Look at the girls, that kinda thing.
    Leave a little earlier, go slower and live longer.
     
  17. Mar 5, 2012
    JeffsJeep04

    JeffsJeep04 Member

    Menomonie, WI
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    Maybe Mine is just especially tight, but I got mine over 60 according to the speedo and it felt just fine. A little cold with no windshield in February in Wisconsin, but no stability issues!
     
  18. Mar 5, 2012
    1960willyscj5

    1960willyscj5 Well-Known Member

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    I did not buy mine to go fast.
    I bought mine to go places!
    And there are a lot of places in Arizona and Nevada, that you can not get to unless you ride a horse. . . . or drive one of these old jeeps.
    At 5 foot wide they will go a lot of place the new stuff won't fit at all.
     
  19. Mar 5, 2012
    Corveeper

    Corveeper Member

    Chanute, Kansas
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    I’ve been told its because I’m crazy, so I stopped going to that psychiatrist.
     
  20. Mar 5, 2012
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    One guy said I was short.
    When I asked for a second opinion he said my mother dressed me funny.
    Go figure!
     

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