Can anyone help me out? Looking for a new ESC/motor. On some Web sites, the motors are listed as "4600" instead of the # of turns. Can someone tell me how the number of turns translates into kV (what's the kV equal for a 10.5 or a 13.5, for example). Looking at an online hobby store Web site, there's a big price difference with the same ESC listed with a "number of turns" motor vs an ESC listed with a "kV" motor.

Example:
Losi Xcelorin ESC with a 13.5 motor: $224.99
Losi Xcelorin ESC with a 6400kV motor: $149.99
(these are just examples.)

Thanks!

**delete**

Number of turns and KV don't relate unless you are talking about the exact same motor design in both cases.

The two examples you gave are different motor and speed control designs. The 13.5 is a slotted sensored motor with a sensor based controller and the 6400KV is a sensorless (probably unslotted) motor with a sensorless controller.

There are more parts in a sensor based, slotted motor and probably more electronics (though maybe less software) in a sensor based controller.

Generally speaking, the difference would indicate whether the system, or motor, is sensored or non-sensored.

We use number of turns to designate the number of actual winds on our sensored motors. Non-sensored motors do not have winds that can be counted, so they use Kv.

We offer 4 budget priced ($149.00) Havoc sensored systems for spec racing, featuring our ROAR approved Spec brushless motors.

Novak Havoc Spec Systems (http://www.shopatron.com/product/part_number=303X/135.0.151.0.0.0.0)

Cross-posted with ta_man. Here is our BL motor spec chart:

Novak Brushless Motor Spec Chart (http://www.teamnovak.com/products/brushless/motor_spec_chart.htm)

We list the Kv numbers of all of our motors here. So you can figure the Kv equivalent of given number of winds. Kv of 13.5 is 3300.

The 13.5 is a slotted sensored motor with a sensor based controller and the 6400KV is a sensorless (probably unslotted) motor with a sensorless controller.OK, so I guess my next question, then, is what is the difference between "sensored" and "non-sensored"? What's "slotted"? The timing ring? The rotor? The can? Is there an advantage to one over the other? Disadvantages? I want to run the 13.5 single-cell class (I guess that's the "new" stock class equivalent for TOUR racing and at our local tracks down here in Florida).

Sorry for the questions if they've been answered before, but I'm new to the whole brushless thing...

jimmy if you are going to use this motor in your oval pan car there are only two choices..

novak or epic duo based motors....steer clear of the other motors...those two brands are the industry standard...and team epic is based out of debary ..less cost for shipping and billy bruce is at every oval race in florida for customer support....

Here is a page we prepared on the difference between the two technologies:

BRUSHLESS MOTORS: SENSORED VS. SENSORLESS (http://www.teamnovak.com/tech_info/brushless/sensor_vs_sensorless.html)

The only motors approved for spec racing are the sensored motors. Here is our info page, on the SS Pro motors, which includes the description about the ring colors:

SPEC CLASS RACING FOR PROS (http://www.teamnovak.com/products/brushless/sspro_motors/index.html)

OK, so I guess my next question, then, is what is the difference between "sensored" and "non-sensored"? What's "slotted"? The timing ring? The rotor? The can? Is there an advantage to one over the other? Disadvantages? I want to run the 13.5 single-cell class (I guess that's the "new" stock class equivalent for TOUR racing and at our local tracks down here in Florida).

Sorry for the questions if they've been answered before, but I'm new to the whole brushless thing...
Novak answered on the sensored vs unsensored and Kat told you which motor to use for your pan car. So that leaves the "slotted" question.

A slotted motor has a laminated iron stator (the outside part that doesn't rotate) that has slots in which the wire is wound. An unslotted motor typically has no iron stator (and therefor nothing to have slots). The winds are just packed in the can and held in place with epoxy or some similar adhesive.

There are reasons for each design. Post #2 in this thread has more details on this: http://www.rc-monster.com/forum/showthread.php?t=14381

Note that the poster is the president of castle creations and knows what he is talking about.