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Engine ideas for mud running

Discussion in 'The Garage' started by MudFlap, Nov 16, 2003.

  1. MudFlap

    MudFlap 1/2 ton status

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    I drive my truck in all kinds of stuff; mud, sand, rocks, etc. but I run mainly mud, so should I try to build an engine that turns high rpms to keep up wheel speed, or can I build and engine like a 383 that will turn less rpms. Do I want an eninge that produces a lot of torque at low rpms or an engine that produces high rpm horsepower?

    Thanks

    Trey
     
  2. 75-K5

    75-K5 3/4 ton status

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    377 understroker /forums/images/graemlins/deal.gif
     
  3. MudFlap

    MudFlap 1/2 ton status

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    I thought about that, and I got a friend that has a 377, but I a a 350 tbi and I would rather just build that engine.

    Trey
     
  4. sled_dog

    sled_dog 1 ton status

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    If I were building a mud motor I'd build a mid range motor. Something that makes good torque and good horsepower. Like My k5 is planned to be a trail/rock rig so I want bottom end torque and don't care too much about top end horsepower(except for the occasional burn out). If I were you I'd put new heads, intake, and a little cam that gives you some good midrange power, headers and good exhaust should make some good power for mud.
     
  5. SUBFAN

    SUBFAN 1/2 ton status

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    That TBI 350 is an EXCELLANT candidate for a 383 build up....Roller cam, good heads better intake and exhaust, you won't be dissapointed.

    Seeing your gearing, a cam with about 220* duration at .050 will put a grin on your face. That is if you don't mind using the loud pedal. A bit smaller if you lean more towards the street and conservative....
     
  6. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    Yep I run one awesome power revs like a dirt bike
     
  7. MudFlap

    MudFlap 1/2 ton status

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    So it would be alright to build a 383 then, even though it will cost me some RPMs.

    Trey
     
  8. K1Orion

    K1Orion 1/2 ton status

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    I'm no expert but...

    If you can make the power to keep your tires cleaned out in the mud at a lower RPM, then you won't need to rev as high.
    You will be happier on the street and won't need the RPM's in the mud. You could run a little less gear, lower #, too keep wheelspeed without raising RPM.

    Basicly, HP=torque x RPM , so the more TQ you build at lower rpm the more HP you will have where you can use it.
     
  9. MudFlap

    MudFlap 1/2 ton status

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    Thanks, thats what I was looking for.

    Trey
     
  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    I'm no expert but...

    If you can make the power to keep your tires cleaned out in the mud at a lower RPM, then you won't need to rev as high.


    [/ QUOTE ]

    Sounds like it'd work in theory, but it doesn't work in real life.

    Only way it'd work is if you could make 600 ft lbs at 2000 RPM or something so that you could run 2.56:1 gears in the axles or something. Because that doesn't work, RPM is the key.

    If you want to mud RACE, you need a high RPM big block.

    If you just want to play in the mud, any motor will work, one built with a little bit bigger than a towing type cam will work great. Use a decent set of heads so it can breathe up to 5500-6000 RPM and set your rev limiter at 6,000 and have fun at it.

    I have a stock internals 350 with a 6,000 RPM rev limiter and it works fine. If you find yourself bogged down while out playing in the mud, use a lower gear. It's not really an issue if you keep your RPMs up though.

    Plus, if you're not racing, you don't need a motor that idles like crap and only runs on premium gas. A regular motor is all you need for fourwheeling. Of course *a little* more power is always good, but beyond that, you're just going to break stuff. There is really no special motor to use to go out and play on the trail. Anything from a 6 cylinder to a Diesel to a 496 gasser will work usually if you know what you're doing and the rest of it is set up correctly.

    If you want to race, you need power. If you just want to wheel, any good running motor will work out just fine.
     
  11. slimlynn1

    slimlynn1 1/2 ton status

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    I agree with 84 Chevy K10. If you are not mud racing you don't really want a high reving engine. It will only cost you extra coin to make that high RPM power that you don't really need. If you want build your 350 block into a 383 strocker with good low to mid range power. Your wallet will thank you. Or you could just buy this and be done with it. Just my $0.02.
    HT 383
    You could easilly spend that much and more building a reliable high reving small block.
     
  12. CyberSniper

    CyberSniper 1/2 ton status Premium Member

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    I'd aim for a 383. I've yet needed to use more than 4500rpm and that was playing out in the sand and horsepower robbing small rocks. I'd really like the bottom end torque of a 350 or 383 because then I wouldn't have to rev it out.

    Honestly, my 305 is more than sufficient for wheelin'. I can break all four tires loose whenever I see fit. I've yet to be in mud where my 305 couldn't accelerate in.

    In my opinion, high-rpm offroad motors have only 3 purposes: sand/cross country, mud drags, and tractor pulls. I put my 305 together as a high-rpm motor because I like to go fast on the asphalt too.
     
  13. Z3PR

    Z3PR Banned

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    [ QUOTE ]
    So it would be alright to build a 383 then, even though it will cost me some RPMs.

    Trey

    [/ QUOTE ]It's all in how you build your 383. I had a 383 in a 73 Camaro that I wasn't afraid to turn some R's with. Just build it for mid range power and you should be happy with it. Propper gearing for what you're doing also comes into play.
     
  14. TWISTEDJACK

    TWISTEDJACK 1/2 ton status GMOTM Winner

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    My 391 stroker will turn 6000rpm safely and has a lot of torque /forums/images/graemlins/thumb.gif The 377 will rev quicker though.
     
  15. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    I would think a 350 would probably be your best bet for a mud truck. A 427 big block would be kind of cool too for higher RPM power. I also agree with Tim that you don't need lots of power to have fun offroad. I hardly ever use anything past 1/2 throttle with my built up 406 and I run mostly mud too. The only time I need and use a lot of power is trying to cross deep sticky mud, hill climbing, and racing my buddies through the above.I also have boggers which love to eat HP. It's all about gearing in a lot of slower wheeling especially rocks. I think a good 350 with gears set up for it's power range and you will have enough power for just about anything except the bigger size tires.
    The reason why I built a motor is because I wanted more power for towing, acceleration, and that sound at the tail pipe. My old 350 really was sufficient offroad. Bottom line wheel what you got and have fun doing it. /forums/images/graemlins/thumb.gif
     
  16. MudFlap

    MudFlap 1/2 ton status

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    Thanks guys, your replies have been real helpful, I think that I will go with a 383.

    Trey
     

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