Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - sort-of armchair sprocket changes

dcb · 07-10-2011, 02:43 AM

k, did some figuring with piston speed. Formula is stroke in inches * RPM / 6.

my 1.95" stroke hits 1200fpm @ 3700 rpm.

Of course the question is how much power do I need in top gear at whatever speed 3700 rpm represents. Which would be 27mph with the new 17 tooth sprocket.

So I think I will try centering my shifts on 3700 rpm and see if that is tolerable anyway since I'm otherwise flying blind, and with the new sprocket and traffic allowing, I should be in 5th by 27mph. Just gonna have to take my time, not a problem

With a little "luck" my power demands will just be met at 27mph and I can just cruise there all day at uber peak efficiency

with both sprocket changes I hit 1200fps (3700rpm) at 30.5mph

07-10-2011, 02:43 AM	#4 (permalink)
dcb needs more cowbell Join Date: Feb 2008 Location: ÿ Posts: 5,038 pimp mobile - '81 suzuki gs 250 t 90 day: 96.29 mpg (US) schnitzel - '01 Volkswagen Golf TDI 90 day: 53.56 mpg (US) Thanks: 158 Thanked 269 Times in 212 Posts	k, did some figuring with piston speed. Formula is stroke in inches * RPM / 6. my 1.95" stroke hits 1200fpm @ 3700 rpm. Of course the question is how much power do I need in top gear at whatever speed 3700 rpm represents. Which would be 27mph with the new 17 tooth sprocket. So I think I will try centering my shifts on 3700 rpm and see if that is tolerable anyway since I'm otherwise flying blind, and with the new sprocket and traffic allowing, I should be in 5th by 27mph. Just gonna have to take my time, not a problem With a little "luck" my power demands will just be met at 27mph and I can just cruise there all day at uber peak efficiency with both sprocket changes I hit 1200fps (3700rpm) at 30.5mph __________________ WINDMILLS DO NOT WORK THAT WAY!!!