Double 212 predator engines on go kart

[blackleg miner]

am I missing something? Why not just get one 420 predator? I'm putting one on my arachnid. Don't get me wrong, I'm not against trying something new and interesting. Maybe the total Hp is way better with two half size engines? Price?

 

[Shifter8921]

Tire size-18" rear 16" front
Terrain- Rough/moderate
Im not sure what the wight will be, the drivers will both be around 120
And the arachnid kart im guessing like 200 or 250 :/

 

[Shifter8921]

Well most posts that ive looked at on other forums say that they experience better performance with two of lets say 5hp creating 10hp than a single 10hp engine
Reason being that two engines that are 5hp will run the same top speed as a single 5hp but get there alot faster
with the right gearing, you are taking advantage of the extra horses and getting more top end and taking away some rediculous amounts of low end power

 

[jamyers]

That makes sense - better than 2x the low-rpm torque compared to a 10hp engine.

 

[landuse]

Tire size-18" rear 16" front
Terrain- Rough/moderate
Im not sure what the wight will be, the drivers will both be around 120
And the arachnid kart im guessing like 200 or 250 :/

With tyres that large, and the fact that you are going to be doing mostly rough/moderate offroading, I would suggest getting a TC. I am not too sure how that would work on a duel engine kart (or if it even can). If you use a centrifugal clutch, you would have to gear quite low because of the terrain and large tyres. I would suggest about a 8:1. This could be achived bu a 10T clutch and 80T sprocket (which is large), or a 12T clutch and a 96T sprocket (which is impractical). You might be looking at getting a jackshaft with a cent clutch.

I have no idea how you would install both engines if you are using a jackshaft or a TC

 

[Shifter8921]

I really doubt im gonna use a tc
I think i might just use regular clutch

 

[Doc Sprocket]

I really think CVT's are NOT the way to go here. Due to the self-regulating characteristics, I can see them fighting each other.

Best to skip the jackshaft in favour of smaller tires. Also- the two smaller engines MAY do better than a larger engine of an equal rating due to a smaller, lighter reciprocating assembly and lesser rotating mass. As a general rule, you can expect a small block engine to have snappier throttle response compared to a big block.

 

[Shifter8921]

Would one 6.5 be even enough to have fun with on such a heavy kart??

 

[DaiSan76]

Would one 6.5 be even enough to have fun with on such a heavy kart??

Depends on your definition of fun. I have about a 150 pound cart with my 200 pound arse and a single 6.5 with a Torque Converter gets me around 25-30 mph, which is plenty fast for my yard.

 

[Doc Sprocket]

The weight is only part of the equation. Those big tires are the other part. If you were to use only one of these engines, I would suggest you do one of two things- either use a CVT, or select smaller rear tires (no more than maybe 16").

 

[Shifter8921]

Im not familiar with a cvt. what does it do?

 

[Doc Sprocket]

"CVT" or "Continuously Variable Transmission" is the proper term for "torque converter".

 

[Shifter8921]

Oh ic

 

[gixxerkart]

I've covered this before.

Dual engines, dual throttle pedals small and right next to each other, and one wheel drive for each engine= a limited slip diff. Amazing fun. Do it.

 

[DaiSan76]

Dual engines, dual throttle pedals small and right next to each other, and one wheel drive for each engine= a limited slip diff. Amazing fun. Do it.

That sounds terrifying.

 

[gixxerkart]

Pfffff......

Not if you know how a limited skip differential works. Safest thing you could do to your kart. This is why high end sports cars have a LSD.

 

[gixxerkart]

I'll post up pics of mine if I ever get it back up and running. The best part is it puts equal weight in the rear, applies power to the outside tire (which you need), and is VERY easy to make and maintain since you only need a one sided axle per engine.

 

[Doc Sprocket]

TWO throttle pedals? Why? Overcomplicated for no good reason. If you have two engines independantly driving the two rear wheels, believe me- you'll have all the cornering characteristics of an LSD (posi) without needing an extra foot.

 

[gixxerkart]

Two throttle pedals, but essentially one pedal split in half. When you split it you can use your foot as the torque vectoring component to decide the split amount. It takes a little one to get used to. But I you understand how a LSD works you'll get the full benefit. Just try it.

 

[gixxerkart]

"Posi" is hillbilly for a straight axle that's welded together. Most hicks don't realize you destroy a pumpkin by Welding it. A TRUE limited slip is different. Wiki it and you'll see what I mean.