So Cal Suspension Posted May 20, 2013 Report Share Posted May 20, 2013 Good point about swing arm flex. It is probably much more noticeable on asphalt for those of you who race on tarmac. JL Engineering has done a TON of research and testing on swing arms, and flex. On Thursday, I watched the video he made testing 6 different brand +8" swing arms. You would be SHOCKED to see how much some of these "premium" swing arms flex. It's unreal. That being said, JL's ladder bar is a miniscule amount of flex in comparison to the other high end swing arms. STY's swingarm looks great. He's addressed, and triangulated all of the key areas. People often overlook triangulating the pivot tube. Sure, lots of manufacturers put small gussets near the pivot tube, but nothing like you did. Also, the plating forward of the shock mount is a HUGE improvement. Lots of drag guys don't want an overly strengthened swing arm because of weight, but I just don't get it. You're going to lose more MPH and ET with your swing arm flopping around like a piece of cooked spaghetti than you will by the 1 or 2 lbs you'll gain by have a strong swing arm. Take a piss and a shit before you go race, and it'll make up for it. Great work. Quote Link to comment Share on other sites More sharing options...
possum Posted May 20, 2013 Report Share Posted May 20, 2013 Which 6 different brands? Quote Link to comment Share on other sites More sharing options...
So Cal Suspension Posted May 20, 2013 Report Share Posted May 20, 2013 "premium" is all I'm going to say. It might not have been exactly 6, but they were all "name brand" arms. I won't be any more specific than that, until there are hard numbers, or JL decides he wants me to post the video. Quote Link to comment Share on other sites More sharing options...
SlowerThanYou Posted May 20, 2013 Report Share Posted May 20, 2013 I sent u a pm. Is it better to connect the upper bar of the wheelie bar to the top of the swingarm or to the chassis? If it's with a solid strut it, it can be either way. With a shock it needs to be on the swingarm. Good point about swing arm flex. It is probably much more noticeable on asphalt for those of you who race on tarmac. JL Engineering has done a TON of research and testing on swing arms, and flex. On Thursday, I watched the video he made testing 6 different brand +8" swing arms. You would be SHOCKED to see how much some of these "premium" swing arms flex. It's unreal. That being said, JL's ladder bar is a miniscule amount of flex in comparison to the other high end swing arms. STY's swingarm looks great. He's addressed, and triangulated all of the key areas. People often overlook triangulating the pivot tube. Sure, lots of manufacturers put small gussets near the pivot tube, but nothing like you did. Also, the plating forward of the shock mount is a HUGE improvement. Lots of drag guys don't want an overly strengthened swing arm because of weight, but I just don't get it. You're going to lose more MPH and ET with your swing arm flopping around like a piece of cooked spaghetti than you will by the 1 or 2 lbs you'll gain by have a strong swing arm. Take a piss and a shit before you go race, and it'll make up for it. Great work. We had the problem of what we call crab walking. It would happen under the highest loads from the starting line to about 330'. I think the critical point is the triangulated pivot tube as you brought up. Another spot the builder & I changed was the larger diameter bottom rails. The swingarm is a +14 & weighed 9 lbs. as shown. If I remember right there was no difference in weight from our previous +8 chromoly swingarm. Quote Link to comment Share on other sites More sharing options...
LT ROOKIE Posted May 20, 2013 Author Report Share Posted May 20, 2013 Can u or your builder build me a swingarm setup like that one Quote Link to comment Share on other sites More sharing options...
SlowerThanYou Posted May 20, 2013 Report Share Posted May 20, 2013 I sent you a PM. Quote Link to comment Share on other sites More sharing options...
10milmike Posted July 19, 2013 Report Share Posted July 19, 2013 I saw that video too. I would never bUy one of those arms after seeing that. One of the almost snapped it two. FTW Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted July 20, 2013 Report Share Posted July 20, 2013 About a year ago I was talking about swing arm flex and was told I was full of it..... Quote Link to comment Share on other sites More sharing options...
LT ROOKIE Posted July 20, 2013 Author Report Share Posted July 20, 2013 Slower than u turbo chassis just built me one similar to yours with the bracing and strut bar. Thanks for the info and pics Quote Link to comment Share on other sites More sharing options...
SlowerThanYou Posted July 20, 2013 Report Share Posted July 20, 2013 Slower than u turbo chassis just built me one similar to yours with the bracing and strut bar. Thanks for the info and pics You're welcome! I hope it works for you, as good as it does for us. Quote Link to comment Share on other sites More sharing options...
SlowerThanYou Posted September 22, 2013 Report Share Posted September 22, 2013 We designed this to help prevent the twisting we had before. We was unsure if it was going to work & had it built with a torque strut. It has worked so well, we don't use the torque strut anymore. There's a few key areas that may or may not be seen. That I feel makes this thing work very well. TTT for Casey. Quote Link to comment Share on other sites More sharing options...
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