04-27-2010, 09:26 PM | #1 |
Gone Wild
Join Date: Apr 2010
Location: God's country.. Luziana
Posts: 274
|
Help with swing arm design
Building a FAST EZGO cart ..
I stripped the old marathon to the frame. Putting a Suzuki 600 cc GSXR engine. A-arm front suspension was no problem, got that fabbed up. For the rear I am using a transaxle from an EZGO TXT so I can have a reverse gear. The rear suspension will be a swing arm type that the motor is mounted to so that the engine and rear end move in sync and the chain drive gives no trouble. NOW... I built a strong swingarm out of 2 inch square tubing and mounted it to the frame using 2 inch johnny joints and will also be adding two 2 inch control arm bushings in the middle of the arm between the J Joints for added pivot strength. The swing arm will secure to the rear transaxle with u bolts. I have two new shocks from a VW Beetle and may have to go with four beacuse of the weight??? What I need help with is: 1. What is the BEST position to mount the shocks in... or do I need another type of shock system like some sort of coil over system that mounts to the axle? 2. Do I need to design some type of control arm support, or 4 link or triangular link for the rear swing arm in order to keep the rear axle in line and keep it from moving from side to side? My conscern is with all the power from the MC engine and the weight of 2 riders.. when cornering ... the swing arm will give side to side and cause me major problems to include wearing out the pivot joints and bushings quickly. new front end fabbed.JPG jjoint.jpg rear view.jpg shock positions.jpg Please look at pics to get an idea of where i am at. I want to do it right the first time. Any advice is greatly appreciated. |
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04-27-2010, 09:38 PM | #2 |
Totally Bonkers!
Join Date: Feb 2008
Location: Full time RVing
Posts: 1,897
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Re: Help with swing arm design
You could build a "panhard" bar for the back. That is the easyest choise but it will give very slight side movement as the rearend travels. If you want to keep it centered no matter how the rearend travels...build a watts link. More difficult to design and build but it is the best choise. Do some research in the racing enviorment to find what one looks like and it should give you an idea as to how to build one for your build.
Good luck. Rodger |
04-27-2010, 10:05 PM | #3 |
Gone Wild
Join Date: Apr 2010
Location: God's country.. Luziana
Posts: 274
|
Re: Help with swing arm design
Thanks Rodger!
Its funny I do not know what to even search for ... quite the novice learning as I go... lol. Its funny, just thinking about it, I was engineering something very simlilar in my head... as the panhard bar. I think the panhard bar will work and it looks rather simple to fab up! I did not build the mounts for the shocks yet. Any ideas on the position of the rear shocks? Straight up over the axle or more to the front near the pivot area of the siwng arm? Remember the engine will be mounted on the swing arm. E I evarly on, I thought about using pillow mounted bearings to provide the pivot attachment of the swing arm to the frame but did not know if that would work well because of all the jaring and rough movement so I went with a Johnny Joint on each end and will add a couple of short bushing control arms in the middle of the swing arm. Thanks |
04-27-2010, 10:09 PM | #4 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,358
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Re: Help with swing arm design
Just go with what you got...... looks like you have a pretty good start on a finished product here is what I ended up with from the same boat more or less this works really well ..... no matter what the terrain. Notice I tipped my shocks inward the swing arm naturally takes the front to rear sway the shock / coils/ take the side to side and Up and down movement
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04-28-2010, 06:22 AM | #5 |
Gone Wild
Join Date: Apr 2010
Location: God's country.. Luziana
Posts: 274
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Re: Help with swing arm design
Scotty,
Where did u get those shocks... mine are no where that big and I need some heavy duty ones like that !! |
04-28-2010, 06:35 AM | #6 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,358
|
Re: Help with swing arm design
Those are terra toyz shocks. Friend of mine had them ..... they sell them with their long travel kit. dunno if you can buy them separately?
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04-28-2010, 06:42 AM | #7 |
Gone Wild
Join Date: Apr 2010
Location: God's country.. Luziana
Posts: 274
|
Re: Help with swing arm design
K, thx
gone back on ebay... send the lil VW ones back they just look to small. I think I need some rated at 350 lb, at least. |
04-28-2010, 07:38 AM | #8 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,358
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Re: Help with swing arm design
When you lay the shock over you will loose load capacity or strength ...... If it's going to be FAST, then you better start thinking about how you are gonna stop it LOL Keep us posted on your build
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04-28-2010, 10:55 AM | #9 |
Gone Wild
Join Date: Dec 2009
Location: Corpus Christi, TX
Posts: 1,644
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Re: Help with swing arm design
On the bottom arms why not put em at an angle like they do on cars insted of straight back. It keeps it from going left & right. Like on an 80s monte carlo?
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04-28-2010, 12:35 PM | #10 |
Gone to refill cooler...
Join Date: Nov 2009
Location: Sacramento, California
Posts: 1,445
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Re: Help with swing arm design
You could fab a tirangulated link to control side to side movement of the axle. This will also control axle wrap. I have attached a picture of a typical triangulated 4 link set up. Hope this helps!
Kelly |
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