alright well i know you guys all think I'm stupid now be here is what I'm gonna do I'm gonna put a jackshaft on with a 14 tooth sprocket and a 10 tooth sprocket and then i will have a 4.48:1 ratio and i think thats as high I'm gonna go. otherwise it doesn't make sense to put this engine on.
hey guys i have a question
- Thread starter Drfierce
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JMINDY
Member
Let's see if I understand you correctly (and I'm no expert in gear ratio, so someone can help here if I'm wrong)...
Your #10 sprocket is a 40,41, or 420 chain. Your #28 axle sprocket runs a 35 chain. Two different sizes, so a chain won't run directly between the two sprockets. If you run a jackshaft in between the #10 & #28, you would be using two #14 sprockets (#14 comes in both sizes, so one would be 35 and another in 40,41). However, your final gear ratio would be 2.80... too low, you'll burn up the clutch.
If you run a #10 to a jackshaft with a #14 (40,41 chain size) and then a #9 (35 chain) to your #28 (35 chain) you get a gear ratio of 4.36. Little low, might still work?
Changing the #9 to an #8 works better in the calculator (4.9 gear ratio), but I don't know if you can get a #8 nor if they come in a 35 chain size...
for gear ratios with jackshaft...
http://www.burrisracing.net/calc/
Your #10 sprocket is a 40,41, or 420 chain. Your #28 axle sprocket runs a 35 chain. Two different sizes, so a chain won't run directly between the two sprockets. If you run a jackshaft in between the #10 & #28, you would be using two #14 sprockets (#14 comes in both sizes, so one would be 35 and another in 40,41). However, your final gear ratio would be 2.80... too low, you'll burn up the clutch.
If you run a #10 to a jackshaft with a #14 (40,41 chain size) and then a #9 (35 chain) to your #28 (35 chain) you get a gear ratio of 4.36. Little low, might still work?
Changing the #9 to an #8 works better in the calculator (4.9 gear ratio), but I don't know if you can get a #8 nor if they come in a 35 chain size...
for gear ratios with jackshaft...
http://www.burrisracing.net/calc/
no the the #28 sprocket runs a 41 chain that is why i had to order the clutch in the beginning. the problem i have with a ratio that high is that it won't be an improvement on the engine i have now anymore.
---------- Post added at 02:05 AM ---------- Previous post was at 02:02 AM ----------
oh I'm sorry i forgot to mention that i have a #32 sprocket that i can use
---------- Post added at 02:05 AM ---------- Previous post was at 02:02 AM ----------
oh I'm sorry i forgot to mention that i have a #32 sprocket that i can use
Poboy kartman
Senior Moments Member
Let's keep this correct: there's nothing low about a 2.8 :1 gear ratio....it's not low it's insanely high !!!!!.
So....4.36:1 is still a little high !!!..
We don't need to be calling anything low until we get around 6:1 or better....(8:1 would be a low gear ratio) . It's the high gear ratio that destroys torque and clutches, while low gear ratios scrub speed....
Poboy kartman
Senior Moments Member
you're right sorry
No problem....we're anything but elitists here...we have some of the best of the best....but we're here to help, not pat ourselves on the back....sometimes...we....(let's be honest....ME.)....get a bit abusive ....to try to shock people into the best line of thinking to help us help them.....( You can lead a horse to water....)
It's a small little mistake....that's been made time and time again....( it's a little confusing to someone new to the gearing game: low= high #'s.....high= low #'s)....therefore, while I thought it was important to point it out.
As long as people listen and examine what we offer with an open mind.....we have all the patience in the world, and will work hard to help them fully comprehend all they need to know to achieve their personal best and become as successful as their circumstances will allow.....
When folks come in acting the fool....dis the forum....ask a question...then get an attitude when the answer differs from what they believe....they don't get popular here at all....and and check out time tends to come rather quickly.....conversely...often...people come here and say: "Sorry for the newbie. question: " WHY? WE'RE HERE TO HELP PEOPLE WHO DON'T KNOW! "
Soooo.....anyway....it was just because there's enough confusion and problems with gear ratios, that we just don't need ANYTHING that helps confuse new members in this area....(like reversed high/ low ratios)!!!!
Its all good....you're fine....
---------- Post added at 04:19 PM ---------- Previous post was at 04:04 PM ----------
Hmmmmmmmm.........Then that would be 6:1....WOW!!!! What a shocker! Hmmmmmm.....(Maybe that's why we ALMOST ALWAYS recommend that as a starting point!!!!!)
90% of the time people that say I'm going to use a higher gear ratio is some wannabe cyberdreamer that dreams of going insanely fast...(after playing MarioKart)... and is clueless, jobless, ...and generally worthless!!!!!
I may have to do a reconciliation with my ex....taking out the trash...doesn't seem like a chore anymore!
where did you get a sprocket to fit the wheel?
Kartorbust
Inmate #627
If you want to run a 6:1 ratio you could also look for a 10 tooth clutch and 60 tooth sprocket. More than one way to get a 6:1 ratio. Here's a 10 tooth clutch for #41 chain http://www.amazon.com/Hilliard-Extreme-Duty-Centrifugal-Clutch-Tooth/dp/B0006UEXGQ
60 tooth sprocket for #41 chain http://www.mfgsupply.com/4-8249.html
Oh Poboy that comment about Mario Kart speed is so true. Just up until recently, past few months I always thought that they got the speed using 3600 RPM engines and high gearing and not 2 stroke engines revving high or even ungoverned 4 strokes modded to take the abuse.
60 tooth sprocket for #41 chain http://www.mfgsupply.com/4-8249.html
Oh Poboy that comment about Mario Kart speed is so true. Just up until recently, past few months I always thought that they got the speed using 3600 RPM engines and high gearing and not 2 stroke engines revving high or even ungoverned 4 strokes modded to take the abuse.
I got the sprocket from OMB warehouse. The rear wheel on mine was changed to a 6 inch wide go kart single tire rim. I still had to weld the sprocket to the hub. The flang on the hub was to small to get a substantial set of bolts on to secure it. It works great so I'm happy.
ezcome-ezgo
G'me sumthin to write on
You have broken a cardinal rule of Karting. The Kart Gods are angry.
Poboy kartman
Senior Moments Member
No....he didn't!!!!! He welded a sprocket to a hub. He might have to replace the hub to change the sprocket, but he can easily remove everything to work on or replace. The cardinal rule is "Never weld anything to an AXLE."
Welded sprocket of destruction
When the bike had the 49cc on it whoever had it befor me welded a small bicycle sprocket to the hub. It took me an hour of careful grinding to get it off. Should I ever need to remove the new sprocket, l will just order a new rim, tire and sprocket set. Eventually I want nice shiny crome ones with good knobby tread.
When the bike had the 49cc on it whoever had it befor me welded a small bicycle sprocket to the hub. It took me an hour of careful grinding to get it off. Should I ever need to remove the new sprocket, l will just order a new rim, tire and sprocket set. Eventually I want nice shiny crome ones with good knobby tread.
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ezcome-ezgo
G'me sumthin to write on
Oops! Now I have angered the Kart Gods with my blasphemy. Dang it!
Flyinhillbilly
The great cornholio
I'm with this guy, I have nothing to base it on, but I've crashed my minibike several times, and it handles pretty good as far as minibikes go. With a 212, 6:1 gearing, and no governor ( most guys seem to end up removing them) it will go fast enough to seriously injure a human. My neighbor wheelied mine over backwards and cracked his tailbone. That said, I'm looking forward to seeing this, I just might tend toward a lower gear ratio or leave the governor intact ( that's a lie, I'll do almost anything to go faster) that dual rear wheel setup just kind of concerns me as far as handling at speed goes.
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