KCvale
In memory of KCvale 1959 - 2019
You are on social security and have 6 kids living with you an RV?
What, did you start having kids at 55 or what?
What, did you start having kids at 55 or what?
The whole topic of this thread was, 'Abandoning The Clutch'.
Nothing with a running engine can sit still without a clutch.
'Nuff said I think.
The OP's engine has a 3/4" shaft; unsure if there's enough hub and keyway for a 1" pulley for that shaft.
The OP MIGHT need a series of pulleys, jackshafts and/or Torq/Vertor to get the low gear ratio he desires.
The way to figure out what'd work is for him to do research and find out what worked for the many motorized bikes of similar build.
Once you find the ratio that works/worked for others, you build from there.
Take 15:1 gear ratio, as an example.
(15" sheave/1" pulley).
If that was the ratio that worked for others,
then he's way off with his present gear ratio of
4.69:1(15" sheave/3.2" crank pulley).
Try a 5"jackshaft pulley/2" crank pulley,
with a 15" sheave/2" jackshaft pulley.
(5"/2") x 7.5 = 18.75:1 ratio.
Speed of 15.42mph @ 3600rpm
would most likely climb that very steep hill.
Now to go 37.6mph @ 3600 rpm,
your gear ratio should be around
7.7:1 .
You should be able to do that with a 1.94" pulley.
Since the 2" pulley is measured at its outer circular edge,
the belt should ride lower in the pulley's groove.....
like at 1.75"-1.94" diameter.....
which is 8.57:1 or 7.73:1 gear ratios.
2" pulley:
https://www.ebay.com/itm/Chicago-Di...146914&hash=item3f7c11b593:g:8WkAAOSwInxXNmiU
1.75" pulley"
https://www.ebay.com/itm/NEW-CHICAG...079432?hash=item1e6d148208:g:12gAAOxyshFRe7NU
Now all these ratios must be adjusted when the OP removes the governor and adds a cam.
The OP's engine has a 3/4" shaft; unsure if there's enough hub and keyway for a 1" pulley for that shaft.
The OP MIGHT need a series of pulleys, jackshafts and/or Torq/Vertor to get the low gear ratio he desires.
The way to figure out what'd work is for him to do research and find out what worked for the many motorized bikes of similar build.
Once you find the ratio that works/worked for others, you build from there.
Take 15:1 gear ratio, as an example.
(15" sheave/1" pulley).
If that was the ratio that worked for others,
then he's way off with his present gear ratio of
4.69:1(15" sheave/3.2" crank pulley).
Try a 5"jackshaft pulley/2" crank pulley,
with a 15" sheave/2" jackshaft pulley.
(5"/2") x 7.5 = 18.75:1 ratio.
Speed of 15.42mph @ 3600rpm
would most likely climb that very steep hill.
Now to go 37.6mph @ 3600 rpm,
your gear ratio should be around
7.7:1 .
You should be able to do that with a 1.94" pulley.
Since the 2" pulley is measured at its outer circular edge,
the belt should ride lower in the pulley's groove.....
like at 1.75"-1.94" diameter.....
which is 8.57:1 or 7.73:1 gear ratios.
2" pulley:
https://www.ebay.com/itm/Chicago-Di...146914&hash=item3f7c11b593:g:8WkAAOSwInxXNmiU
1.75" pulley"
https://www.ebay.com/itm/NEW-CHICAG...079432?hash=item1e6d148208:g:12gAAOxyshFRe7NU
Now all these ratios must be adjusted when the OP removes the governor and adds a cam.
Yep that's why you make a MANUAL CLUTCH... frees the engine. Then when you apply pressure it adds tension to a belt..The whole topic of this thread was, 'Abandoning The Clutch'.
Nothing with a running engine can sit still without a clutch.
'Nuff said I think.
Yep that's why you make a MANUAL CLUTCH... frees the engine. Then when you apply pressure it adds tension to a belt..