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Frame/Suspension/Brake... Talk & Q&A All things... Frame/Suspension/Brake

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  #1  
Old 06-11-2019, 07:32 AM
redtailboa redtailboa is offline
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Default Suspension Travel

Hello , I've been working on a 38 ford pick up , chopped top ,custom frame ,4 link rear , 9 inch rear and 37 ford suicide front , i have the front all together now i will only have about one inch clearance from top of axle to bottom of frame . I'm looking to find out how much suspension travel or clearance is needed when everything is put together before i decide how to fix my problem , either switch too spring over axle , longer spring perches , clearance frame a little more . Thanks
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Old 06-11-2019, 11:33 AM
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Looks a little too close for comfort and that's before the load from the engine and trans!


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Old 06-11-2019, 02:44 PM
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You probably want at least 3" clearance. I'd say go more like 5". Keep in mind that the axle can tilt as well. The last thing you want is to contact the axle with the frame, you'll be replacing a lot of parts. Looks to me like the best bet would be to increase the height of your Z and move your spring mount down.
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Old 06-11-2019, 04:09 PM
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Ooooh... No worky.

Honest advice? Keep your juice spindles and go to a spring over or spring behind axle setup. Those later setups just aren't meant to be used like that. Sorry to be the bearer of bad news, but that's a no go...
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Old 06-11-2019, 06:44 PM
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The area in front of the cross tubing needs to be cut off and the top and bottom of the frame blended into the tubing. That will give you clearance you need without doing anything else.

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Old 06-11-2019, 09:00 PM
redtailboa redtailboa is offline
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Thanks for the advice guys . I ended up extending the spring perch a little and cutting off the front of frame to clearance the axle , like Old Iron suggested . This is my first open wheel build and have learned alot from the site
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Old 06-12-2019, 07:53 AM
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The other problem I am seeing here is the perch design. Where the spring mounts is just a flat piece of plate, and presents a major weak point. The way it is currently constructed will flex under normal driving conditions, and then it will break. Remember, the entire weight of the front half of the car is resting on that point. It needs some serious gusseting, especially if you have extended it even further.
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Old 06-12-2019, 09:02 AM
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Quote:
Originally Posted by Blue Eyed Devil View Post
Where the spring mounts is just a flat piece of plate, and presents a major weak point. The way it is currently constructed will flex under normal driving conditions, and then it will break.
I hadn't even paid attention to that part but, you are correct. It needs a vertical plate on each side welded on top of the perch plate

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Old 06-12-2019, 09:39 AM
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More idea's for you redtail...

https://www.google.com/search?q=suic...X8B_vvM:&vet=1
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Old 06-12-2019, 06:05 PM
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Beef up that perch, for sure!

I also strongly suggest you reinforce your cut wishbones. Weld the pie cuts and weld a "fish plate" over the affected area, like this...



Do not square cut these plates. The pointed "diamond" ends serve to eliminate "stress risers", which you'll have with straight vertical cuts and welds...

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