What are we talking about here?
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Road Warrior
Joined: Mar 2009
Posts: 1,471
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From: Toledo, Ohio
What are we talking about here?
When someone mentions cc's and nothing else, does it really mean anything? My HD is 1450cc and stock from factory is a little over 70hp, correct? But a new Triumph I saw an add for is 799c and 90hp. A crotch rocket may be 600cc or so, but I could never keep up with it with my bike. So does it really mean anything when someone just spouts off that their bike has x amount of cc's? I don't mean to sound ignorant, just would like to understand how this all works. Thanks
Club Member
Joined: May 2007
Posts: 145,895
Likes: 821
From: 40 miles Northeast of Indy..
When someone mentions cc's and nothing else, does it really mean anything? My HD is 1450cc and stock from factory is a little over 70hp, correct? But a new Triumph I saw an add for is 799c and 90hp. A crotch rocket may be 600cc or so, but I could never keep up with it with my bike. So does it really mean anything when someone just spouts off that their bike has x amount of cc's? I don't mean to sound ignorant, just would like to understand how this all works. Thanks
As per Nightrider Dyno test..
http://www.nightrider.com/biketech/hplist_twin_cam.htm
.
Big Kahuna HDF Member
Joined: Apr 2008
Posts: 38,428
Likes: 896
When someone mentions cc's and nothing else, does it really mean anything?
It only refers to the Cubic Centimeter cylinder displacment of the engine.
My HD is 1450cc and stock from factory is a little over 70hp, correct? But a new Triumph I saw an add for is 799c and 90hp. A crotch rocket may be 600cc or so, but I could never keep up with it with my bike.
So does it really mean anything when someone just spouts off that their bike has x amount of cc's?
NO. it means nothing.
I don't mean to sound ignorant, just would like to understand how this all works. Thanks
It only refers to the Cubic Centimeter cylinder displacment of the engine.
My HD is 1450cc and stock from factory is a little over 70hp, correct? But a new Triumph I saw an add for is 799c and 90hp. A crotch rocket may be 600cc or so, but I could never keep up with it with my bike.
So does it really mean anything when someone just spouts off that their bike has x amount of cc's?
NO. it means nothing.
I don't mean to sound ignorant, just would like to understand how this all works. Thanks
CYLINDER DISPLACEMENT
:: The engine displacement formula is the standard formula for computing the volume of a cylinder of any type with an added factor that represents the number of cylinders in the engine.
:: The cross-sectional area of the cylinders is determined and the volume of the individual cylinders is computed by multiplying the area by the stroke length. Multiplying the result by the number of cylinders gives the engine's total displacement. The formula is:
Bore diameter x bore diameter x .7854 x stroke length x number of cylinders = displacement
Dimensions in inches will give the displacement in cubic inches. Dimensions in millimeters will give displacement in cubic millimeters, which are then converted to the standard measure of cubic centimeters with the formula:
Cubic millimeters ÷ 1000 = centimeters
For example, compute the displacement of a single cylinder engine that has a bore of 54 mm and a stroke of 53 mm. The equation then is:
54 x 54 .7854 x 53 x1 = 123,672.42 cubic millimeters
We now reduce to cubic centimeters by diving by 1000
123,672.42 ÷ 1000 = 123.67 cubic centimeters (cc)
HORSEPOWER AND TORQUE
Horsepower and torque are measures of engine performance. They are related to the extent that one cannot exist without the other. Torque is the measure of the amount of work an engine can do and horsepower is the measure of the amount of work done in a given time. The time factor for horsepower computations is the engine's crankshaft speed, as measured in revolutions per minute.
Formula for computing horsepower:
:: Torque x rpm ÷ 5252 = horsepower
For computing torque when horsepower and rpm's are known:
:: Horsepower x 5252 ÷ rpm = torque
Seasoned HDF Member
Joined: Feb 2008
Posts: 23,001
Likes: 11,441
keep in mind the difference in HP and torque.
While an HD maybe rated at a lower HP The Torque is often much higher.
While related and you can not have one without the other there is a difference. I have a 500cc lawn tractor and a 500 cc ATV no way on earth you can compare the two.
My 103 2011 Hd has about 102 torque at 3500 rpms it will flat make that 880 lbs plus the weight or two riders and bagage move.
Even my older EVO with a 1340CC while low on rated HP will run down the road with little effort two up and loaded down and has done so for many many miles
Put that much weight on a high HP crotch rocket and it is not going to do well.
Different engine different uses if you want a really fast HD try a VROD.
Of build on the VTWIN HD they are almost limitless.
Check out what real builders do with them like ORCA
While an HD maybe rated at a lower HP The Torque is often much higher.
While related and you can not have one without the other there is a difference. I have a 500cc lawn tractor and a 500 cc ATV no way on earth you can compare the two.
My 103 2011 Hd has about 102 torque at 3500 rpms it will flat make that 880 lbs plus the weight or two riders and bagage move.
Even my older EVO with a 1340CC while low on rated HP will run down the road with little effort two up and loaded down and has done so for many many miles
Put that much weight on a high HP crotch rocket and it is not going to do well.
Different engine different uses if you want a really fast HD try a VROD.
Of build on the VTWIN HD they are almost limitless.
Check out what real builders do with them like ORCA
Last edited by smitty901; Jun 23, 2012 at 04:04 PM.
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