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Thread: Driveshaft loop thickness???
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07-23-2009 #1
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Driveshaft loop thickness???
I have access to some materials and tools to fab a driveshaft loop/oval for the back portion of my frame. It's 2"x1" box tubing. What is the best wall thickness to use for this project?? What we plan to do is make two U-shaped pieces then cut them to the right overall length then weld the two pieces together to make an oval that I can cut and weld back into my rear frame cross member for the driveshaft to pass through. But I want to make sure I use the right size tubing but not over do it.
67 Firebird Convert 455 +.060 Johnny Winters TH400 74cc KRE d-port flowed @ 310 cfm heads piston dished 16cc H-beam rods Comp Cam 305-AH-8 cam 108* LSA 253/260 @.050 duration .577/.594 lift w/1.65 rockers Ford 9" 3.55 Detroit Locker M/T Sportsman Radials 31x18x15 on Convo Pro 15x15s
Honest dad that 455 on the side of the block is a serial number
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07-23-2009 #2
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You need to check into the rules for any competition that you might enter, or perhaps with the organizations that deal with the sort of competition that your car is most closely aligned with.
SCCA Modified Category gives you the option of 2" x 1/4" flat stock or 7/8" x 0.065" tubing. Other organizations may have different ideas here.
Norm'08 GT coupe, 5M, suspension unstockish (the occasional track toy)
'19 WRX, Turbo-H4/6M (the family sedan . . . seriously)
Gone but not forgotten dep't:
'01 Maxima 20AE 5M, '10 LGT 6M, '95 626, V6/5M; '79 Malibu, V8/4M-5M; '87 Maxima, V6/5M; '72 Pinto, I4/4M; '64 Dodge V8/3A
07-23-2009 #3
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All I have ever seen were 1/4 x 3
07-23-2009 #4
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Remember this is a rear loop not up front. I didn't see anything in the NHRA book regarding a back loop. I emailed their tech folks for feedback.
67 Firebird Convert 455 +.060 Johnny Winters TH400 74cc KRE d-port flowed @ 310 cfm heads piston dished 16cc H-beam rods Comp Cam 305-AH-8 cam 108* LSA 253/260 @.050 duration .577/.594 lift w/1.65 rockers Ford 9" 3.55 Detroit Locker M/T Sportsman Radials 31x18x15 on Convo Pro 15x15s
Honest dad that 455 on the side of the block is a serial number
07-23-2009 #5
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I was looking at the Solo (autocross) rules. The GCR for wheel to wheel may be different.
Norm'08 GT coupe, 5M, suspension unstockish (the occasional track toy)
'19 WRX, Turbo-H4/6M (the family sedan . . . seriously)
Gone but not forgotten dep't:
'01 Maxima 20AE 5M, '10 LGT 6M, '95 626, V6/5M; '79 Malibu, V8/4M-5M; '87 Maxima, V6/5M; '72 Pinto, I4/4M; '64 Dodge V8/3A
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