Harness mounting question
#2464294
03/10/18 02:51 PM
03/10/18 02:51 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
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So I’ve got my roll bar in and I’m looking to mount my harness. It’s a V-mount style harness that mounts to the backbrace at a single point. I can’t find anything in the rule book about what’s an acceptable mount type. It just says “securely mounted”. Do I have to weld a tab onto the backbrace, or is it acceptable to drill and bolt the mounting tab directly to the bar?
Feel free to show me how you did it.... Thanks!
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Harness mounting question
[Re: StealthWedge67]
#2464297
03/10/18 02:58 PM
03/10/18 02:58 PM
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Joined: Dec 2005
Posts: 11,552 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
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Either or. If you drill and use a through bolt in the bar, you need to weld a through tube in it for a reinforcement. Typically a piece of 5/8"-.058 CM will work for a 1/2' bolt or something similar for a 7/16".
If the results don't match the theory, change the theory.
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Re: Harness mounting question
[Re: StealthWedge67]
#2464305
03/10/18 03:22 PM
03/10/18 03:22 PM
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Joined: Dec 2006
Posts: 2,110 Byron, NY
W.I.N. Racing
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top fuel
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Byron, NY
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I take the mounting tabs off the belts and wrap them around the Roll Bar tube (more surface area for the Belt to pull against) Additionally I don't believe "Y" belts are accepted by the IHRA or NHRA
"SFI 16.1 - Shoulder harness: A belt assembly, one strap for each shoulder, intended to restrain movement of the upper torso and shoulder regions. It includes adjustment and mounting hardware. Optional cross strap can be used to hold the shoulder harnesses together and if the cross strap is in front of the driver it must be capable of being released in a single motion. A Y-type shoulder harness, i.e. both shoulder straps become a single strap with one attachment point, is not permitted. (Effective January 1, 2005)"
Last edited by W.I.N. racing; 03/10/18 03:27 PM.
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Re: Harness mounting question
[Re: CMcAllister]
#2464309
03/10/18 03:33 PM
03/10/18 03:33 PM
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Posts: 4,319 Puyallup, WA
StealthWedge67
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Either or. If you drill and use a through bolt in the bar, you need to weld a through tube in it for a reinforcement. Typically a piece of 5/8"-.058 CM will work for a 1/2' bolt or something similar for a 7/16". This is what I was hoping to see.... makes perfect sense. thanks!
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Harness mounting question
[Re: W.I.N. Racing]
#2464313
03/10/18 03:39 PM
03/10/18 03:39 PM
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Joined: Jan 2003
Posts: 4,270 Morrow, OH
markz528
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Morrow, OH
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I take the mounting tabs off the belts and wrap them around the Roll Bar tube (more surface area for the Belt to pull against) Additionally I don't believe "Y" belts are accepted by the IHRA or NHRA
These are ok. These are not considered Y type. https://www.summitracing.com/parts/rjs-1126201/overview/
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Harness mounting question
[Re: StealthWedge67]
#2464322
03/10/18 03:48 PM
03/10/18 03:48 PM
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Posts: 4,270 Morrow, OH
markz528
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Last edited by markz528; 03/10/18 03:48 PM.
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Harness mounting question
[Re: markz528]
#2464346
03/10/18 04:51 PM
03/10/18 04:51 PM
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Posts: 4,566 Motor City
6PKRTSE
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We used a tab like this on my car and another flat plate also for double shear protection.
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Re: Harness mounting question
[Re: W.I.N. Racing]
#2464370
03/10/18 05:40 PM
03/10/18 05:40 PM
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Joined: Dec 2005
Posts: 11,552 Fulton County, PA
CMcAllister
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Additionally I don't believe "Y" belts are accepted by the IHRA or NHRA That would be correct. The V belt is made with one length of material with a mounting tab attached in the middle and it can't come apart to be wrapped. I like the individual harnesses wrapped as well but he was asking about his V assembly.
If the results don't match the theory, change the theory.
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Re: Harness mounting question
[Re: StealthWedge67]
#2464372
03/10/18 05:43 PM
03/10/18 05:43 PM
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Joined: Dec 2005
Posts: 11,552 Fulton County, PA
CMcAllister
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If using a tab, make sure it is mounted in line with the direction of pull.
If the results don't match the theory, change the theory.
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Re: Harness mounting question
[Re: StealthWedge67]
#2464544
03/11/18 01:26 AM
03/11/18 01:26 AM
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StealthWedge67
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I’ll be drilling the bar and inserting a sleeve with a through bolt.
Thanks all.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Harness mounting question
[Re: StealthWedge67]
#2464686
03/11/18 12:48 PM
03/11/18 12:48 PM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
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I’ll be drilling the bar and inserting a sleeve with a through bolt. That's the way I've always done mine. And as previously mentioned, angle the sleeve so that the direction of pull is inline with the belts. I use grade 8 hardware, too. I don't know if it's a requirement, but I feel better about spending the extra $1.00.
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Re: Harness mounting question
[Re: Dave Hall]
#2464780
03/11/18 03:28 PM
03/11/18 03:28 PM
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Joined: Dec 2005
Posts: 11,552 Fulton County, PA
CMcAllister
Mr. Helpful
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The wrap around kind work really well! They don't really slide around because of the slots in the seat. No fab necessary... To be legal, they want some type of a retainer on the bar to keep the belts from sliding out of position. Anything from a couple of muffler clamps to a nice welded D loop will suffice.
If the results don't match the theory, change the theory.
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Re: Harness mounting question
[Re: CMcAllister]
#2465060
03/12/18 02:17 AM
03/12/18 02:17 AM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
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The wrap around kind work really well! They don't really slide around because of the slots in the seat. No fab necessary... To be legal, they want some type of a retainer on the bar to keep the belts from sliding out of position. Anything from a couple of muffler clamps to a nice welded D loop will suffice. Car utilizes stock seats, so........
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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