Post by dave632 on Dec 8, 2019 9:52:42 GMT -7
I did some fooling with some Hornby cars that I got from Clive.
Not to bad a design, motor is a little tough to remove. I took out the chokes and capacitor as they are only there for noise suppression.
The stock arm is between 10.5 and 11 ohms. I took the slower of the 2 stockers which was only running between 11 and 12 MPH and put
a 6 ohm Tomy armture in it. They have the same timing. Motor magnets were good reading in the 1100-1200 range. This is good for
ceramic magnets. Armature spacing was a little tight as I had to cut one of the motor bearings down to get the Tomy arm in. I also changed
the gear set to a higher ratio. Car became violent off the line pulling the guide out of the slot. I put a set of wheelie bars on it and it made it
down the track some times but it was spinning the tires hard off the line. The stocker was still beating it but it was charging hard at the stripe.
I put some Super tires on it but it would not stay on the track and it was pulling the back of the motor out of its holder with them. The rear holder
on these chassis is weak. I put the stock tires back on and cleaned them up. Then it finally was able to beat the stocker running about 7 MPH
faster than it did originally and having about 4 MPH and .04 ET on the faster stocker. Traction magnets are not strong enough on this chassis
and my next improvement will be in that dept.
Dave
Hornby cars
Not to bad a design, motor is a little tough to remove. I took out the chokes and capacitor as they are only there for noise suppression.
The stock arm is between 10.5 and 11 ohms. I took the slower of the 2 stockers which was only running between 11 and 12 MPH and put
a 6 ohm Tomy armture in it. They have the same timing. Motor magnets were good reading in the 1100-1200 range. This is good for
ceramic magnets. Armature spacing was a little tight as I had to cut one of the motor bearings down to get the Tomy arm in. I also changed
the gear set to a higher ratio. Car became violent off the line pulling the guide out of the slot. I put a set of wheelie bars on it and it made it
down the track some times but it was spinning the tires hard off the line. The stocker was still beating it but it was charging hard at the stripe.
I put some Super tires on it but it would not stay on the track and it was pulling the back of the motor out of its holder with them. The rear holder
on these chassis is weak. I put the stock tires back on and cleaned them up. Then it finally was able to beat the stocker running about 7 MPH
faster than it did originally and having about 4 MPH and .04 ET on the faster stocker. Traction magnets are not strong enough on this chassis
and my next improvement will be in that dept.
Dave
Hornby cars
