Engine for offroading

Discussion in 'Off-Roading' started by Domgb, Jul 14, 2016.

  1. HotRodPC

    HotRodPC Administrator Staff Member

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    Don't ever underestimate a 292 with a couple little mods and it being a stump puller. I'd have one. My only issue with them, is aftermarket mods are expensive. Price a 4bbl intake and headers for a 292. Not cheap, and I haven't even looked in a long time.
     
  2. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Back in the day when my brother had his 73s his on friend had an 81 6er with an older head and headers and a 4bbl and 4 speed it ran good but just sounded funny lol
     
  3. HotRodPC

    HotRodPC Administrator Staff Member

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    Yep, they do sound funny. Almost like a pist off bee.
     
  4. ratchetmaster

    ratchetmaster Junior Member

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    Big block all day long.
     
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  5. 87scotty

    87scotty Full Access Member

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    Turbo nitrous= replacement for the displacement
     
  6. shiftpro

    shiftpro Full Access Member

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    This.^^^

    Stroke a 454 to 496. 781 heads. Deck the hell out of the block so the piston isn't sitting down in the hole.
    Go high compression, like minimum 10.1, and run propane with two mixers.
     
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  7. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    You'd need some dome with 781s they are 119cc+ chambers if I remember correctly. I'm running 96cc and a pretty good dome and a .021 metal head gasket to get 10.5:1 in my wee big block.
     
  8. 74 Shortbed

    74 Shortbed Full Access Member

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    Yep, they are 119cc the 049's are 122cc
     
  9. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Wow my brain does kinda still work lol
     
  10. 74 Shortbed

    74 Shortbed Full Access Member

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    :rotflmao::rotflmao:
     
  11. shiftpro

    shiftpro Full Access Member

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    Absolutely. I have Probe forged pistons that came with the stroker kit.
    They say they are 10.1 but of course that is relative to the heads used and how the block is decked. Lots of power and efficiency left on the table when the piston tops out below the deck.
    I'll have to assemble the block with crank and two caps, and one rod and piston (without rings) to determine how much more can be milled off.
    There are the kinds of details that make a difference imo. But it's a lot of extra work and if you don't like this... well...
    I must have an easy 40 hrs in porting my heads.
    But I live for this.
     
  12. moboss

    moboss Junior Member

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    im going thur the same issue right now!! what to build for a motor for wheeling. my conclusion biger is better. displacement is king!! im going with a 350 sbc and a turbo. you want the torque but hp is also needed.
     
  13. theBIGnaud

    theBIGnaud Full Access Member

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    Big block or small block you want to keep a few things in mind when choosing a displacement/stroke cam/intake/headers.

    The question you want to ask yourself is where are you going to be spending the MOST time, at what RPM, in what activity?

    Shorter stoke = higher rpm power potential.
    longer stroke= lower rpm power potential

    diff gear ratio plays a huge part in what rpm range the engine will be running at in EACH gear. 5.86 vs 3.73 ect

    typically an engine used for off road will have a long stoke motor with a Low geared rear end ie 5.86

    a DD with some umph will have a long stroke with a high rear end ie 3.73

    and finally TYPICALY mud slinger drag racer or pure race set up will have a short stroke and mid gear 4:10

    -BUT This can be hazy as many racing applications my have No2 injection or other forms of boosting power; super charging, turbo charging. The cheapest and most reliable option is No2. Many will disagree. DON'T LEAN YOUR AFR!


    tire size plays a roll in tq multiplication as well bigger tire more tq response from rear gear. lower top speed.

    Do you want a crawler, DD, or mud sprayer?

    You have to choose one if you want the most performance.

    Do some reading about intake and port theory, combustion chamber size compression ratio ect. this help you understand what you may want.

    Just throwing a bunch of huge parts on an engine will not make power. Huge parts require large displacements with high combustion ratios.

    If you want a great DD i would suggest 4 bolt two p rms SBC, mid CR heads (9.5:1) some nice piston rings, ARP head studs, mid rise single plane intake, 650carb, long tube headers, mid truck cam 265ish dur. and 4:11 diff gears. 75hp shot if you wanna drop panties. If you get an addiction to panties or speed 71 series super charger.

    ditch forged pistons, ditch rods or hopped up valves, forget special machining. unless you want more than 500hp in any block.
     
  14. Jrgunn5150

    Jrgunn5150 Questionable methods

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    I guess you guy's do different wheeling than I do.

    If it's for mud, or sand, some high strung, custom everything motor works great.

    But down trails, hours idling along, living it's entire life below 2k, I find stock works best. They never overheat, they rarely fail, and if they do, parts are everywhere.
     
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  15. spanky55amg

    spanky55amg I'll give u $5, a hardy handshake, & 5 fish sticks

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    Propane sounds like a band-aid for something that isnt correct.

    Its like guys that run water/alcohol/nitrous injection into a turbo system or on to an intercooler b/c they need to cool down the air temp. If thats true, whats wrong, b/c a good running system doesnt need outside influence.

    And whlie a turbo and nitrous are replacements for displacement, I dont think you want either for offroading. Centrifugal or roots blower though.....
     

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