Forums
New posts
Search forums
What's new
New posts
New profile posts
Latest activity
Members
Registered members
Current visitors
New profile posts
Search profile posts
Donations
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
General Minitrail Talk
Tech Area
Compression question, yet another...
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="69ST" data-source="post: 174282" data-attributes="member: 5"><p>No disrespect...but...you've gotta be precise when it comes to gearing these little machines. They don't make much torque thus, if you're more than ~3% off, you'll feel the difference, beyond about 5% the motor will either fall on its face or you'll be giving away the store in needless additional revs per mile. With a non-stock transmission and who-knows-what primary gear pair, I'd want the gear teeth count for the 4th gear pair & primary drive pair before making any recommendations on sprocket combo. A 72cc tune will pull 4.77mph/1000rpm optimally and not much more (5.00mph would be over-the-top) unless there are exceptional circumstances.</p><p></p><p>As for top speed, fastest stock 72cc-powered stocker I've heard of belongs to our own CJPayne...50mph, in a full tuck. That's really hauling arse for a stock CT70, even with a fairly light rider aboard. Basic physics say that top speed is limited, ultimately, by horsepower...and that usable power starts running out at 80% of that number. With the available torque, most CTs have good, usable, speed into the high 30s and that's about it. Gearing will never compensate for lack of horsepower but, incorrect gearing can cost you in acceleration and mph.</p></blockquote><p></p>
[QUOTE="69ST, post: 174282, member: 5"] No disrespect...but...you've gotta be precise when it comes to gearing these little machines. They don't make much torque thus, if you're more than ~3% off, you'll feel the difference, beyond about 5% the motor will either fall on its face or you'll be giving away the store in needless additional revs per mile. With a non-stock transmission and who-knows-what primary gear pair, I'd want the gear teeth count for the 4th gear pair & primary drive pair before making any recommendations on sprocket combo. A 72cc tune will pull 4.77mph/1000rpm optimally and not much more (5.00mph would be over-the-top) unless there are exceptional circumstances. As for top speed, fastest stock 72cc-powered stocker I've heard of belongs to our own CJPayne...50mph, in a full tuck. That's really hauling arse for a stock CT70, even with a fairly light rider aboard. Basic physics say that top speed is limited, ultimately, by horsepower...and that usable power starts running out at 80% of that number. With the available torque, most CTs have good, usable, speed into the high 30s and that's about it. Gearing will never compensate for lack of horsepower but, incorrect gearing can cost you in acceleration and mph. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
General Minitrail Talk
Tech Area
Compression question, yet another...
Top