Custom 70cc engine build

Is it worth it or stupid?

  • YES

    Votes: 20 62.5%

  • Hell no

    Votes: 2 6.3%

  • Kinda

    Votes: 4 12.5%

  • YES

    Votes: 3 9.4%

  • Nah I'll pass

    Votes: 3 9.4%
  • Total voters
    32
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Z.hb71 said:
Good question. Mostly a guesstimate, this cyl was dynoed at 17.39hp on a scooter, soooo I'm going to be running e85 which add alittle, also don't forget to remove drivetrain loss cuz rcs have wayyy less drivetrain loss than a scooter. A scooter has about a 5% drivetrain loss so add that. When I first run it, it will probably "only" make 12hp cuz I'm using a small 19mm carb, once I switch to a 25mm it will open it up alot. I'm Hoping for 20hp, seams realistic to me but I could just be delusional lolView attachment 47754 that's the Dyno sheet for the cylinder. Mines the red line, mk1. This Dyno sheet is for a rebranded 1. They now have a mk2 but it was out of stock.
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Should be a beast regardless?
 
Z.hb71 said:
Oh also I had to cut this brace alittle to fit the motor in but it didn't weaken the cage which is goodView attachment 47593
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So far all looks good I had that rant about my rovan 45cc I've punished the engine and still going strong even ramped the pool piston for higher rpm but I'm looking at the new rcmax gt40 aswell because it looks good it's only £800 40mm bore 32mm stroke I want one because they look good over the generic hobby grade look of the rovan 45 they look like true engines if you get what I mean

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Teejay112 said:
So far all looks good I had that rant about my rovan 45cc I've punished the engine and still going strong even ramped the pool piston for higher rpm but I'm looking at the new rcmax gt40 aswell because it looks good it's only £800 40mm bore 32mm stroke I want one because they look good over the generic hobby grade look of the rovan 45 they look like true engines if you get what I mean

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yeah the gt40 looks sweet!! (y) not tooo pricy for what it is. cant wait till this motor is done. lookin fir 20hp lol
 
Teejay112 said:
Yeah gonna be a beast in a baja you gonna go to a 4x4 like a losi or a heavier platform

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maybe, in the future i do wanna get a losi 5t and put this in it, probably too much for a baja :devilish: i don't want my baja to be undrivable, theres a guy named silverssonyoutube i think and he has a baja with a rcmax 90 with like 28hp and its undrivable, don't want mine to be like that
 
Z.hb71 said:
maybe, in the future i do wanna get a losi 5t and put this in it, probably too much for a baja :devilish: i don't want my baja to be undrivable, theres a guy named silverssonyoutube i think and he has a baja with a rcmax 90 with like 28hp and its undrivable, don't want mine to be like that
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Losi 5t are not really up to the power of the 70cc engines mate that's why most are going down the hybrid route now.
 
mark35 said:
Saying that though John's 71 losi is a monster..
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i saw that vid. that guy can drive! i would like to know since i don't really know much about the handling of a big bore and what they handle best in and what not, why would a 2wd hybrid handle better than a 4wd losi? i would think the 4wd losi would b better cuz it wouldnt wheelie but i wouldn know.
 
Z.hb71 said:
i saw that vid. that guy can drive! i would like to know since i don't really know much about the handling of a big bore and what they handle best in and what not, why would a 2wd hybrid handle better than a 4wd losi? i would think the 4wd losi would b better cuz it wouldnt wheelie but i wouldn know.
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I'd say break the mould find a way to make it work as a 4wd without going hybrid if you can build your engine usi g different parts to your own spec you will figure out the drive train easily

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Z.hb71 said:
i saw that vid. that guy can drive! i would like to know since i don't really know much about the handling of a big bore and what they handle best in and what not, why would a 2wd hybrid handle better than a 4wd losi? i would think the 4wd losi would b better cuz it wouldnt wheelie but i wouldn know.
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It's not about the handling a 4wd will handle better than a 2wd fact, its because the baja drive train can handle much more power than the losi 5ive
 
Teejay112 said:
I'd say break the mould find a way to make it work as a 4wd without going hybrid if you can build your engine usi g different parts to your own spec you will figure out the drive train easily

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like make a 4wd baj? was thinking about it, i might try it, would require alot of fabrication. i might build another baj for that instead of using my current. i dunno so many ideas. i do like hybrids tho,
mark35 said:
It's not about the handling a 4wd will handle better than a 2wd fact, its because the baja drive train can handle much more power than the losi 5ive
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ohh.
 
Z.hb71 said:
like make a 4wd baj? was thinking about it, i might try it, would require alot of fabrication. i might build another baj for that instead of using my current. i dunno so many ideas. i do like hybrids tho,

ohh.
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Yeah that or even get a losi and see what you can do to beef up the drive train whatever route you take you know it's all your hard work

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