Home Forums Briggs & Stratton 4-Cycle Racing Top Speed and HP for Briggs Animal and/or WF.

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    • #38958
      brian heaton

      I’m a newbie in the karting world, and I’m running a shifter. Just wanted to get some clarification.

      Ran into this guy the other day, and he’s telling me his kart with a Briggs animal is a 100 mph kart. I’m calling B.s. on this. But he was relentless about his kart beating my shifter.

      From what i know about shifters they are +/- 36 hp, and most can pull 100 depending on weight of driver gearing etc. From my limited readings a animal puts out 10hp? And a WF around 15-18hp?

      basically how much HP does a Animal and WF have, and what is their avg. Top speed.


    • #38960
      Shawn Welte

      Which Animal?  The LO206 Animal is about 10 Hp.  The ProGas Animal is a bit more. A blue printed methanol Animal around 13 Hp.  A fully modified open Animal 16+Hp, heard some will special builds will make 20 Hp.

      Bug - Alley Kat II - McCulloch - Coyote - B&S LO206

    • #39001
      James McMahon

      Top speed will vary a lot with aero. No animal is going to make same power as a typical 125cc shifter without block bracing I think.

      I have heard that WF’s can hit 100mph on road courses, drafting in a pack with a near laydown driver setup, narrow track, nice aero nosecone etc. But thats barely breaking 100 at the end of a straight and they are not too hot in the turns with the narrow track.
      On the same straight your typical CIK shifter will be humming along at 105-108 for most of it and likely running 10 second/lap faster. Put a 125cc shifter motor on that laydown type body and you are looking 120ish.

      Practical example, Blackhawk Farms this year
      Briggs Animal 360 Fastest lap: 1:26.9
      CIK125 Shifter:  1:13.5

      The briggs animals in this example make more power than a WF and yes these are dry times, same day same track.

      On a sprint track, the times will be closer, but neither a shifter or an Animal are likely to hit 100MPH

    • #39015
      James McMahon

      Here’s an example, WF vs 125 Shifter. It should skip to 16:50


    • #39273
      Jon Romenesko

      100mph out of an Animal?  Not a chance.  Well, ok…maybe with a tailwind…off a cliff.  Or as a Bonneville special.  Or maybe on a road course (see James’ post).  If you’re talking both in sit-up sprint setups, then there’s no way.


      The Animals are great engines, but aren’t really comparable to a shifter aside from the fact that they’re both kart engines.

      S2 Semi-Pro Stock Moto - SKUSA Rocky Mountain ProKart Challenge


    • #43426
      Bob Vehring

      Jon’s post above is 100% right, then again its 100% wrong, mostly because your comparing many different types of Animals.
      We have raced animals since day 1, actually several years before it had the Animal name, we started with Intec’s.
      Most people recognize the LO 206, WF, and Animal names, there’s actually several variations and more versions of these.
      Heres a rough set of HP numbers
      LO 206 8.8
      WKA/IKF Animal 10.5-11
      WKA Limited 14-15
      Opens 24 is easy, 30 is possible

      That leaves WF which is kind of a odd duck. World Formula came about overseas as the name of a complete class. This was at a time when CIK though once again the end of 2 strokes was around the corner. The concept was for multiple engine brands and there was a set of guidelines the proposed engines would need to meet. Notable here is all engines were to make 15 hp
      Does a Briggs WF make 15 hp? Out of the box, not on our dyno, but more important , CAN IT? Absolutly.
      The WF uses a bigger cam, bigger carb and more compression then the Animal. Those things allow it to make more power then an Animal, HOWEVER, if you understand engines and making power, those things produce that extra power at a higher RPM. The Briggs WF has a Rev limiter to increase life and keep things under control. Take it from 7 grand to 8 grand or more and there plenty more HP there.

      One other thing that should be touched on here as long as your comparing speeds. My kids have done Road Racing since they were 12, Theres a great deal of differance in chassis in this. For Animals we have classes that use chassis right off the sprint track, we also have Road Race class that use Sit up sprint body work. Not a lay down chassis, but far faster then a sprint track body work kart with a full 38 in nose. CIK body work is about useless for Areo ( yes we’ve run classes with it)
      At Blackhawk Farms, a 2 mile track in the midwest, using exactly the same engine rules (WKA BP), sit up sprint karts will lap the sprint karts in a 15 min race.
      The second race at Blackhawk as far as I know was the first time a Stock BP Animal broke 100 MPH. We have been in the 95-98 range for years. Limited Mod Animals are usually in the 110 mph range. Remember these speeds are with extremely good Road Race specific chassis, not CIK. To understand that compare CIK, 125 shifter times, to the road race 125 shifters. Areo is everything

    • #43464
      Alan Michel

      Example from what I see at my track(and my Mychron data)

      Legal World formula at Phoenix Kart (PKRA, normal sprint kart track, skusa Springnatuonals will be held here in May)

      Shifter Skusa legal   44.5 seconds, top speed 86mph

      world formula 51 seconds  top speed 59mph

      lO206  not sure about top speed but Is close to 53mph and time around 54 seconds



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