Clinician
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Post by billwgol on Sept 5, 2013 10:06:30 GMT -6
P.S. I'm not interested in any of these monster big bore kits you all claim a bigger than they are!!! I think of the problem and some men think things are bigger than they really are!!! I'm just interested in putting a longer stroke crank in my scooter, 100 cc or larger crank in my 49cc gy6 engine
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Clinician
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Post by billwgol on Sept 5, 2013 10:00:47 GMT -6
All I wanted to know is if I could put a 100 cc or larger crank in my 49 cc gy6 scooter I don't care if you know how to do math or not just let me know if the crank will fit thank you..
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Clinician
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Post by billwgol on Sept 5, 2013 9:51:07 GMT -6
If I measure something is 50 millimeters across is that not the same as 5 centimeters... you can play all kinds of games with numbers but 50 millimeters is going to be the same distance 5 centimeters all day long... 50 × 50 × 50 millimeters cube is going to be the same size as a 5 × 5 × 5 centimeter cube
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Clinician
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Post by billwgol on Sept 5, 2013 9:19:40 GMT -6
 guys let's take a 350 Chevy.... 4 inch bore... 3.48 inch stroke... 4×3.14× 3.48×8=349.6704.... 350 chevy.... that's how you calculate volume |
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Clinician
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Post by billwgol on Sept 5, 2013 8:54:56 GMT -6
To calculate volume you take the surface area multiply it by the height.... the surface area of a 5 centimeter piston... 5 cm x 3.14 = 15.7 sq. cm × the heights or in this case, stroke 4.14 centimeters = 64.998 cubic centimeters... that's how you can calculate volume of a cylinder
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Clinician
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Post by billwgol on Sept 4, 2013 21:39:39 GMT -6
Make sure everything is grounded good...a lot of times if its not grounded good you turn two things on in feedback through the other to get the ground.. I've seen all kinds of crazy stuff happened to automotive lighting because of the background..
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Clinician
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Post by billwgol on Sept 4, 2013 21:29:42 GMT -6
ctpgs..I think people on here or maybe I need to go back to grade school math.. the scooters are measured in cubic centimeters.. not cubic millimeters... 50 mm is equal to 5 centimeters.. 41.4 mm is equal to 4.14 centimeters... if that comes out to more than 65 cc, you show me the math the brings it up to 80 cc or more..
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Clinician
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Post by billwgol on Sept 3, 2013 4:56:14 GMT -6
Scooterbob, 100cc big bore kits, do not totally up to100cc's you end up with a total of about 65cc do the math bore and stroke does not equal 100 cc's I'm looking for something bigger I probably have to change crank possibly do some work on the engine case that's fine I can do all that. I don't know the cranks specs will the 100 cc crank fit into my 49cc case
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Post by billwgol on Sept 2, 2013 18:42:49 GMT -6
The bore is 5 cm × 3.14 × stroke 4.14 cm = 64.998 cc. if you came up with anything different let me know how... far cry from the 100 cc it's advertised to be...
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Post by billwgol on Sept 2, 2013 12:33:27 GMT -6
GY6 49cc needs rebuild. Can I up grade this engine to a 125 or even 150 by installing crank cylinder and head of 125 or 150??
The 100cc big bore kits only actually give you about 65 total cc. I would like to get as much engine as I can on the rebuild....even 100cc would work..
Thanks for any and all tech support you all can help with...
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Post by billwgol on Mar 17, 2013 14:05:25 GMT -6
Hi everyone I found out a sure way to tell it is as follows, basically the 64mm valves the lower edge of the valve spring retainers is just below the top of the head surface. The 69mm valves the lower edge of the valve spring retainers just is just above the top of the head..
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Post by billwgol on Mar 15, 2013 11:15:18 GMT -6
HELP!!! Could someone tell me how I can tell the which head 64mm or 69mm valves, is on my 49cc scooter engine gy6 139qmb without pulling the engine apart, I've tried to find out online and I can't find any clear way... thanks for any help I would really appreciate it..
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guys let's take a 350 Chevy.... 4 inch bore... 3.48 inch stroke... 4×3.14× 3.48×8=349.6704.... 350 chevy.... that's how you calculate volume