BMI's DB12R
03-17-2009, 04:31 AM
#7202
Thanks Gadge,
now i see the difference.
now i see the difference.
03-18-2009, 04:51 PM
#7203
Track looks good and tight. Cant wait to get on it. 
03-20-2009, 06:37 AM
#7205
can the xray front end be fitted to the RR chassis?
03-20-2009, 03:21 PM
#7207
I believe the Xray uses a smaller metric screw to bolt on much like the Hot Bodies car.
03-22-2009, 09:54 AM
#7208
Hi,
is that right that the 12RR comes without a thrust bearing and washers?
is that right that the 12RR comes without a thrust bearing and washers?
03-22-2009, 12:01 PM
#7209
We do not use (or supply) a thrust bearing with the car. A thrust bearing hinders the diff action on the car due to the excess drag.(Thrust balls are sandwiched between washers which= drag). With using the flanged bearing as the thrust, there is almost zero side load as it uses the inner race to rest against and doesnt restrict rotation as it is tightened. The thrust bearings are great for use in club racing where you dont want to change the flanged bearing after a big hit. The thrust will increase time between rebuilds but when it comes to performance of the diff, the thrust bearing does hurt performance against a flanged bearing. This is why it is left to the consumer to make the decision if they want to use one. Hope that helps buddy.
03-23-2009, 10:42 AM
#7210
Hey guys,
I am releasing new optional shock pistons for the silva shock. There will be a 2 and 3 hole piston in the kit that have holes that are .005 smaller than the stock piston. The piston edges are radiused for a super smooth feel. They will be sold as a pair and will sell for $7.99 a pair. I will have them up on the website tommorow.
I am releasing new optional shock pistons for the silva shock. There will be a 2 and 3 hole piston in the kit that have holes that are .005 smaller than the stock piston. The piston edges are radiused for a super smooth feel. They will be sold as a pair and will sell for $7.99 a pair. I will have them up on the website tommorow.
03-23-2009, 10:50 AM
#7211
We do not use (or supply) a thrust bearing with the car. A thrust bearing hinders the diff action on the car due to the excess drag.(Thrust balls are sandwiched between washers which= drag). With using the flanged bearing as the thrust, there is almost zero side load as it uses the inner race to rest against and doesnt restrict rotation as it is tightened. The thrust bearings are great for use in club racing where you dont want to change the flanged bearing after a big hit. The thrust will increase time between rebuilds but when it comes to performance of the diff, the thrust bearing does hurt performance against a flanged bearing. This is why it is left to the consumer to make the decision if they want to use one. Hope that helps buddy.
hmmmm
never thought about it that way.
I think the only pan car that uses one is the F103.
Now I'm thinkin' 'bout that too!
03-23-2009, 11:03 AM
#7212
Back in my 1/10th oval days we used an AE thrust bearing that road on the outer race of the ball bearing itself so there was no drag from the washer rubbing the bearing. This resulted in the smoothest and most free diffs I have ever seen. Unfortunately this set-up is too big to fit in a 1/12th wheel. I'm not sure if anyone makes a similar set-up that will.
03-23-2009, 11:13 AM
#7213
Where the resistance comes from is the direction of the load placed on the balls. Thrusts have the balls sandwiched between the 2 washers and therefor has more resistance than on that has none. The thrust can handle a ton more side load being that its intended perpose is to withstand heavy side load. Unfortunately, the flimsy flanged bearings we use now yield much better results in performance due to the lack of resistance. Right now we are only working against 1 set of sandwiched balls in the diff. Adding a thrust just adds more. That being said, a diff with a thrust bearing is very smooth. It just has more resistance during operation. I fully reccomend running a thrust for lack of maintenece and also durabilty purposes. For ultimate performance, i stick with the flanged bearing.
03-23-2009, 12:37 PM
#7214
Tech Adept
In the UK alot of us are running the thrust race from the corally SP12x you need to make up a spaces about 2mm to stop the nut hittind the carbon part of the axle makes for a really smooth low maintenance diff and seems to be better than the slapmaster one.
Jason
Jason
03-23-2009, 01:02 PM
#7215
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Where the resistance comes from is the direction of the load placed on the balls. Thrusts have the balls sandwiched between the 2 washers and therefor has more resistance than on that has none. The thrust can handle a ton more side load being that its intended perpose is to withstand heavy side load. Unfortunately, the flimsy flanged bearings we use now yield much better results in performance due to the lack of resistance. Right now we are only working against 1 set of sandwiched balls in the diff. Adding a thrust just adds more. That being said, a diff with a thrust bearing is very smooth. It just has more resistance during operation. I fully reccomend running a thrust for lack of maintenece and also durabilty purposes. For ultimate performance, i stick with the flanged bearing.
If you are the kind of driver who never touches wood or PVC... then maybe you'd benifit, but either way I dont notice any additional drag from a thrust bearing if the bearings are lubed with Moly and kept clean.