Sliding joint for torque arm front - Lateral-g Forums

funcars · #1 10-19-2010, 08:44 PM

I like the idea of allowing some movement of the front of the torque arm to prevent binding/bending (from the roll axis location). Can you show an example of the second link? I do like the small dogbone from the BMW, but I don't want to over-constrain the torque arm front if it isn't needed either. Another approach would be to use some type of limiters or stops I guess.

exwestracer · #2 10-19-2010, 09:39 PM

Quote:

Originally Posted by funcars

I like the idea of allowing some movement of the front of the torque arm to prevent binding/bending (from the roll axis location). Can you show an example of the second link? I do like the small dogbone from the BMW, but I don't want to over-constrain the torque arm front if it isn't needed either. Another approach would be to use some type of limiters or stops I guess.

Here's an example of the side link. It doesn't restrain the arm in roll at all. Don't mind the coilover...this one is on a dirt late model.

jake72ss · #3 10-20-2010, 03:29 AM

what would be wrong with building the end of the torque arm like Griggs does
http://www.howardweb.org/fastgt/docs/griggs_arm2.jpg http://www.griggsracing.com/images/MTA1000RST.jpg

it looks like the hole in the crossmember is a bit larger than the sleeve and that allows the torque arm to slide front to rear and side to side.

Would this have any downsides?

exwestracer · #4 10-20-2010, 12:39 PM

Quote:

Originally Posted by jake72ss

what would be wrong with building the end of the torque arm like Griggs does
http://www.howardweb.org/fastgt/docs/griggs_arm2.jpg http://www.griggsracing.com/images/MTA1000RST.jpg

it looks like the hole in the crossmember is a bit larger than the sleeve and that allows the torque arm to slide front to rear and side to side.

Would this have any downsides?

If you're planning on limited travel and body roll, nothing wrong with it at all. The bushings even give you the opportunity to "tune" how the arm hits the chassis slightly. Just be careful when jacking the car up, etc. not to over articulate the bushings.

Teetoe_Jones · #5 10-20-2010, 01:56 PM

Read up on this for a bit.

http://www.unbalancedengineering.com/Camaro/TA/

Tyler

funcars · #6 10-20-2010, 09:11 PM

I understand after seeing the picture - Thanks. If the link was oriented to be in tension during braking then I guess the same issue would surface during acceleration when the link would be in compression?

I've never been a fan of the implementation of the Griggs torque arms or watts links. They do seem very durable and functional on a race track where you don't care about noise or vibration - they just need to work and can't break.

BMR Tech · #7 10-21-2010, 08:33 AM

Is your torque arm built from round tube or square? If square we have a machined slider insert with Delrin bushing and poly mount you could use. It fits into a 2x2 x.120 tube. This is what we use at the front of our torque arm kit. The slider tube slides on 6 inches of Delrin equipped with grease channels and a grease fitting. The whole setup is bind-free...

exwestracer · #8 10-22-2010, 11:13 AM

Quote:

Originally Posted by funcars

I understand after seeing the picture - Thanks. If the link was oriented to be in tension during braking then I guess the same issue would surface during acceleration when the link would be in compression?

Yes. That's one argument for using the sliding front mount. IMO, the double spherical is a little more compliant over bumps, as the double mount has no true center of rotation. Probably splitting hairs...