Author Topic: Altered chassis question  (Read 3919 times)

Offline beargeorge

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Altered chassis question
« on: May 19, 2016, 12:10:57 PM »
I am building an altered useing both  the Mark Wiliams blueprint and the SFI chassis specs10.2  for6.00 =7.49seconds e.t..My question is the rear uprights that connects the bottom rail to the shoulder hoop the one that connects the rearend to the chassis.SFI calls for inch and a quarterx0..58 M.W.AA calls for inch and 3 eights x 095,which one do you guys prefer.

Offline Paul New

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Re: Altered chassis question
« Reply #1 on: May 19, 2016, 12:37:13 PM »
10.1E calls out 1.375 x .083 wall.

Offline rooman

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Re: Altered chassis question
« Reply #2 on: May 19, 2016, 01:49:23 PM »
I use the 1.375 x .083 as a minimum.  The altered frame that I currently have on the jig has 1.5 x .095 pressed into an oval configuration the same as Force uses on his funny cars. In fact I had Norm at JFR oval the tubing for me.

Roo
Yeah, I am from the south--any further south and I would have been a bloody penguin.

Offline beargeorge

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Re: Altered chassis question
« Reply #3 on: May 19, 2016, 03:03:16 PM »
Thank You, ROO

Offline beargeorge

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Re: Altered chassis question
« Reply #4 on: May 19, 2016, 03:07:22 PM »
Thank You Paul

Offline Van

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Re: Altered chassis question
« Reply #5 on: May 19, 2016, 11:34:57 PM »
The Altered chassis I built last year got 1 1/2 X 120 wall, because it was in stock & 095 wasn't. I had used the same material on my FED when I built it.   058 never

Offline beargeorge

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Re: Altered chassis question
« Reply #6 on: May 20, 2016, 09:51:18 AM »
All set, i was able to get the 1.375x095 cm from Shapiro Steel,i still dont understand SFI calling for 1.250xo58.Thanks everyone for your help.

Offline janjon

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Re: Altered chassis question
« Reply #7 on: May 23, 2016, 07:18:49 PM »
Roo, I'm curious how it was ovalized. I recently had to duplicate a semi-streamline shape in some aluminium tubing for pylons for a FM antenna array for MD-500 helicopters; I made a die in an wire EDM that formed a tube into the desired shape with the help of a hydraulic press, is that how  JFR does it? Any pics available?
Just keep the same amount of stuff on the right
as there is on the left. Seeing straight ahead is highly overrated....

Offline Paul New

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Re: Altered chassis question
« Reply #8 on: May 23, 2016, 08:13:33 PM »
I have made round moly tubing oval in my press. I use spacers to prevent the tubing from collapsing in the center whenever I do this I do a couple of samples to figure out the correct thickness to press the moly to

Offline rooman

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Re: Altered chassis question
« Reply #9 on: May 24, 2016, 04:58:57 AM »
JFR have a flat die set up for their Trumpf CNC press brake and simply squeeze it in that. I presume that they have programmed the press stroke to end up with the desired result which is a tube with a 1.5" minor axis to match the frame rail diameter. The flat surface on the sides is only about 5/8" wide.

Roo 
Yeah, I am from the south--any further south and I would have been a bloody penguin.

Offline dreracecar

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Re: Altered chassis question
« Reply #10 on: May 24, 2016, 08:18:23 AM »
Don Long started doing that many years ago for wing struts on alc. dragsters.  Since the tubing was thinner than RE uprites, took a lot of testing on the material. Alloy comp.  was a player (it needed % copper) and he dial indicated (because the tubing is not perfect) to index it in the press. I still have some of the rejected pieces(fractures) that I use to make decor tables and such