So using a Simi beef up 6.5. What will I need to hit 80 mph. Fast as possible. Im 170 lbs and frame is a race n frame. Light. So basically what size tires will I need how wide of tires do I need how big of a clutch will I need a torque converter what size of rear sprocket I will need. it is a posi track rear end that I have I would like to hit 80 mile an hour fast as I can
What set up do i need to hit 80mph fast
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mckutzy
Well-known member
A completely different motor...
Right 80mph....
Right 80mph....
How much you got to spend on a engine and torque converter setup ?
Speaking from experience as my mini dragbike has gone 60mph in 300’ and a 2.0x 60’time on the wheelie bars..............if your less than about $2000 it isn’t happening with a 6.5 based engine.
Speaking from experience as my mini dragbike has gone 60mph in 300’ and a 2.0x 60’time on the wheelie bars..............if your less than about $2000 it isn’t happening with a 6.5 based engine.
anickode
Active member
The carsandcameras guys got one to hit 70... They did just about everything that can be done to a rotaderp on a moderate budget and it took like a 2 mile run with a tailwind to do it.
With 11" racing tires, your axle will need to spin like 2500 rpm. So build a motor that can spin 7500 RPM and make about 20 hp, and a 3:1 ratio, and you're there.
To do so, take your rotaderp completely apart, and throw everything but the block in the garbage. Replacement parts list as follows:
Flywheel, crankshaft, con rod, Piston, rings, head gasket, cylinder head, valves, springs, rockers, pushrods, cam, exhaust, and a giant freaking carburetor.
Plus duplicates of most of those parts for the inevitably needed spares.
Then you'll need a specialty clutch that costs probably $400 or more.
And you'll need racing gas (110+ octane), and/or a nitro blend.
And good brakes
And a good helmet and protective gear
And a disability insurance policy.
And you'll probably still need about a 3 mile stretch of perfectly smooth, flat pavement.
Or you could buy a car. That would be a much better idea.
Honestly, you're trying to get something out of an engine that is flat out unrealistic. You're asking how to make a K car to run a 10 second quarter with AutoZone parts.
With 11" racing tires, your axle will need to spin like 2500 rpm. So build a motor that can spin 7500 RPM and make about 20 hp, and a 3:1 ratio, and you're there.
To do so, take your rotaderp completely apart, and throw everything but the block in the garbage. Replacement parts list as follows:
Flywheel, crankshaft, con rod, Piston, rings, head gasket, cylinder head, valves, springs, rockers, pushrods, cam, exhaust, and a giant freaking carburetor.
Plus duplicates of most of those parts for the inevitably needed spares.
Then you'll need a specialty clutch that costs probably $400 or more.
And you'll need racing gas (110+ octane), and/or a nitro blend.
And good brakes
And a good helmet and protective gear
And a disability insurance policy.
And you'll probably still need about a 3 mile stretch of perfectly smooth, flat pavement.
Or you could buy a car. That would be a much better idea.
Honestly, you're trying to get something out of an engine that is flat out unrealistic. You're asking how to make a K car to run a 10 second quarter with AutoZone parts.
firemanjim
Just kartin' around....
You're not gonna do 80 mph fast with a 212.... Even Simi beef..... (Sorry , had to .... ) a 212 will,push you to 80, just not fast. .... If you want fast off the line, you're only gonna do about 25 mph , but be there real quick.....
Do some research. Race karts hitting 80 have lots of money thrown at them so they can reach that speed. And also so they're safe at that speed, and can stop properly....
If you do a little research, you will see tire size, sprocket size, clutch TYPE , ect all play a roll in how fast a kart accelerate, top speed, and stability.... You need to crawl before you walk....
EDIT
a kart engine is gonna give you one of two things..... Fast off the line, or high top speed. You can NOT get both ..... Mechanically impossible with just a 212.....
Do some research. Race karts hitting 80 have lots of money thrown at them so they can reach that speed. And also so they're safe at that speed, and can stop properly....
If you do a little research, you will see tire size, sprocket size, clutch TYPE , ect all play a roll in how fast a kart accelerate, top speed, and stability.... You need to crawl before you walk....
EDIT
a kart engine is gonna give you one of two things..... Fast off the line, or high top speed. You can NOT get both ..... Mechanically impossible with just a 212.....
Nosandwich
The REAL Poboy
Pretty simple, find a really tall cliff, and drive off it.
Kartorbust
Inmate #627
You'll be looking at a single cylinder bike engine. Lifan 200cc 5 speeds go for about $329 or so on eBay, which will cost a lot less than a modified predator for that speed.
Not going to happen with a 212. Even with a better engine you are going to be throwing stupid amounts of money at it to even get close to 80
Nosandwich
The REAL Poboy
Well ....one thing we can all agree on...he'll never make it to 80 especially age 80.
bob58o
SuckSqueezeBangBlow
You might be able to do it once with a whole bunch of Nitrous.
If you set your goal for 88 mph instead of 80mph, you might be able to travel back in time and rethink this before the piston melts and engine explodes. LOL.
You are probably talking the very extreme for a 6.5 HP engine.
Would need to go all out. Bored and stroked, Welded/Reinforced block, billet everything.. Very expensive..
I think your "average" Simi Beef 6.5HP minibike does about a 10 sec 1/8 mile at about 60-70mph.
If you take the engine and CVT off a Jr Dragster and put it on a minibike, now we are getting somewhere fast.
If you set your goal for 88 mph instead of 80mph, you might be able to travel back in time and rethink this before the piston melts and engine explodes. LOL.
You are probably talking the very extreme for a 6.5 HP engine.
Would need to go all out. Bored and stroked, Welded/Reinforced block, billet everything.. Very expensive..
I think your "average" Simi Beef 6.5HP minibike does about a 10 sec 1/8 mile at about 60-70mph.
If you take the engine and CVT off a Jr Dragster and put it on a minibike, now we are getting somewhere fast.
the cars and camera guys cheated.. that street had an incline (well decline )
(No I don't know.. that's only an assumtion based on the video I saw back then.. the last one I saw from them tbh)
Anyways... you won't hit 80mph with an industrial engine without throwing the money at it that'd you'd needed to buy a motorcycle engine in the first place. no exceptions
And most importantly:
Hi Jim, good to see you
'sid
)(No I don't know.. that's only an assumtion based on the video I saw back then.. the last one I saw from them tbh)
Anyways... you won't hit 80mph with an industrial engine without throwing the money at it that'd you'd needed to buy a motorcycle engine in the first place. no exceptions
And most importantly:
Hi Jim, good to see you
'sid
ezcome-ezgo
G'me sumthin to write on
Mmmmm Simi Beef....
mckutzy
Well-known member
I wonder if a steel "exoskeletal" block brace could be made with the bore extension, instead of doing the aluminum welded braces and plates...
All this of course is to prevent rapid jug separation... But steel??? Hmmmm.
All this of course is to prevent rapid jug separation... But steel??? Hmmmm.
It’s already been done sir.......... by the guru Charles Mini Dragbike Mosley himself.
mckutzy
Well-known member
I looked around a bit... Buddy I see has done a number of aluminum ones... None I can see of which are made of steel though...
Ebrownie
Member
Have you ever been in a go kart? I know that I don’t have the balls to go 80 in one, even with the setup to do so. The fastest I’ve ever been going in a kart is 50, and even then in my opinion it feels like you are going 80 just because you are so close to the ground.
I've had a go-kart his 65 mile an hour I want to get this one here to hit 80 85 mile an hour going down a track like a drag strip track to embarrass the mother Truckers that are rolling 20 $30,000 cars I will make it happen with my 6.5 Honda engine
sure, and I will become the president of the united states
ProTip: look at my location
'sid
Desertduler
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What have you been smoking?
Kartorbust
Inmate #627
If you are being dead serious and not a troll, then you'll need something other than a predator engine like what was already mentioned. A lot of us would HIGHLY advise not build a go kart for these speeds., unless you are an excellent welder and metal fabricator. Your best bet is to just out right buy a shifter kart that is used in kart racing. It'll already have everything you need.
When your butt is only an inch off the ground even 30mph feels fast. You'll need a quality helmet (not one that's been sitting in the closet for 10+ years), and gear that most kart racers wear, in case of a wreck to prevent as many injuries as possible. 80mph crash will really wreck your day.
One guy tore his urethra crashing his homemade race kart at a curb doing I think 50mph...tie rod gave way.
When your butt is only an inch off the ground even 30mph feels fast. You'll need a quality helmet (not one that's been sitting in the closet for 10+ years), and gear that most kart racers wear, in case of a wreck to prevent as many injuries as possible. 80mph crash will really wreck your day.
One guy tore his urethra crashing his homemade race kart at a curb doing I think 50mph...tie rod gave way.
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