mount race tailsection with Dzus fasteners?

[MrDude_1]

anyone ever mount their race tailsection with Dzus quarter turn fasteners?

right now i have some nice dome head allen key bolts holding down the tailsection.. but i hate having to hold a nut under it, and undo three screws everytime i want to yank the tail off...
(hiperform tail/subframe BTW)

so i was considering putting flush mount quarter turn fasteners in.. ive used them alot on cars, but ive never installed them or even looked at them carefully.. (i dont generally do bodywork, im more of an engine guy)


i have a couple questions about them:

1. are they strong enough that i can trust them for a DAILY DRIVER kind of bike?

2. are they long enough to go thru the tail, the tail support foam padding and the subframe plate to connect to the back side of the subframe? if not, is it secure enough if i rivited that mount spring to the top of the subframe?

3. can someone reccomend me the exact ones i need with a part number or something? im kinda lost on the options.. i know i want the ones that mount flush with a large plate to spread the load over an area of the tail (and reduce the chance of stress cracks)..... however i dont know what size i should select for the strength i need... and frankly, i nervous about the fact that im about to drill some HUGE holes in my nice tailsection that i have litterally 100s of hours sanding/working perfectly straight...

[mhutch]

Cannot recommend anything in particular but Summit Racing has a good selection of these fasteners fwiw. I personally would not trust them for that application and I have the same setup as you (hiperform). I am using the dome allen bolts with fender washers to help distribute the load and they are a pita. If you decide to try it out I would be very interested in how it works.

http://store.summitracing.com/egnsearch.asp?Ntt=quarter+turn+fasteners&N=700+115+4294858193&Ntk=KeywordSearch

[NT696]

FWIW: Dzeus fasteners are used extensively in the aircraft industry. Mainly, they hold access panels shut, and radial engine cowlings on. I guarrantee you, the most out of balance Harley has only a fraction of the vibrations in a radial aircraft engine at speed. These things are STRONG. Mount the wire base to something solid. I would not reccommend samwiching any layers of foam, as tht would allow some movement and wear. On engine cows especially, sometimes they use a layer of flat fabric cord in between to rest against, and aviod chafing.

[MrDude_1]

FWIW: Dzeus fasteners are used extensively in the aircraft industry. Mainly, they hold access panels shut, and radial engine cowlings on. I guarrantee you, the most out of balance Harley has only a fraction of the vibrations in a radial aircraft engine at speed. These things are STRONG. Mount the wire base to something solid. I would not reccommend samwiching any layers of foam, as tht would allow some movement and wear. On engine cows especially, sometimes they use a layer of flat fabric cord in between to rest against, and aviod chafing.

well, the foam is required.... the fiberglass tail isnt perfectly flat undernieth... a layer of foam under the fiberglass tail spreads the load over the entire surface area.. without it, it would be crushed on the flat subframe and crack.


vibration isnt my worry.. they dont come loose on car panels either.
but my fiberglass fenders/hoods also dont have a 230lb guy sliding from side to side ontop of them... my worry is the stress from that, but i think im just going to go for it anyway.
worse case, i'll have to fiberglass in some large holes, and re-do the bolt setup i have now.

now i just have to order them....

[LeftRightLeftThrottle]

just came across this on the Ed Bargy racing school site

http://www.edbargyracingschool.com/merchandise.htm

This guy's been doing this awhile so if he thinks its a product worth using then I'd say its a good idea...

[MrDude_1]

just came across this on the Ed Bargy racing school site

http://www.edbargyracingschool.com/merchandise.htm

This guy's been doing this awhile so if he thinks its a product worth using then I'd say its a good idea...

thanks for the link.

[ricardo]

well, the foam is required.... the fiberglass tail isnt perfectly flat undernieth... a layer of foam under the fiberglass tail spreads the load over the entire surface area.. without it, it would be crushed on the flat subframe and crack.

To Make a proper mount for your tail section you need to have a Flat "Subscract reference plate" a.k.a. Plywood from a Old skateboard, Nylon from a cutting board, 6061 aluminum, fenolic resin plates, A.K.A. whatever will provide a constant flexfree surface so the "Eggshell" fibreglass does not need to perform a structural function (Or you can build a Honeycomp core to make it far more rigid).

To make the "mounting Plate" lighter, you can use a router and take whatever material is not necesary making channels specially on the bottom side, even drill "Speed holes" with a Hole saw, one thing is for sure Dzeus need a Constant Height (distance from mounting plates) if not they will "move Upwards" when the fibreglass is compress downwards with your body mass making it kind of unconfortable to ride.

you can also use a pair of dome shape bolts with fender washer, secure the Bolt with a Nut right on the other side of the fibreglass (So they do not spin) and then use a "Butterfly wing Nut" and release the tail section from undernet of the bike.

[MrDude_1]

well, the foam is required.... the fiberglass tail isnt perfectly flat undernieth... a layer of foam under the fiberglass tail spreads the load over the entire surface area.. without it, it would be crushed on the flat subframe and crack.

To Make a proper mount for your tail section you need to have a Flat "Subscract reference plate" a.k.a. Plywood from a Old skateboard, Nylon from a cutting board, 6061 aluminum, fenolic resin plates, A.K.A. whatever will provide a constant flexfree surface so the "Eggshell" fibreglass does not need to perform a structural function (Or you can build a Honeycomp core to make it far more rigid).

To make the "mounting Plate" lighter, you can use a router and take whatever material is not necesary making channels specially on the bottom side, even drill "Speed holes" with a Hole saw, one thing is for sure Dzeus need a Constant Height (distance from mounting plates) if not they will "move Upwards" when the fibreglass is compress downwards with your body mass making it kind of unconfortable to ride.

you can also use a pair of dome shape bolts with fender washer, secure the Bolt with a Nut right on the other side of the fibreglass (So they do not spin) and then use a "Butterfly wing Nut" and release the tail section from undernet of the bike.

the hiperform subframe already has the nice flat mounting surface...
(heres a pic from a couple months ago: http://fastgm.com/travis/hawk/02-15-07_2255.jpg )
i know what you mean though...

if this dzus fastener idea doesnt work out, i'll have to mount it from the bottom.. i just really dont like that idea because i have sooo much stuff attached to the subframe (ignition black box, recitifier, rear taillight, turnsignals, rear wiring harness, soon to have a shock resivior, ect...) that its hard to reach IN to get the nuts off.... thats really why i want the quarter turn fasteners.... i have domed allen head bolts, and they work great otherwise..

[ricardo]

the hiperform subframe already has the nice flat mounting surface...
(heres a pic from a couple months ago: http://fastgm.com/travis/hawk/02-15-07_2255.jpg )
i know what you mean though...

Upss sorry about that...

Yes they are pretty flat, but in the posting above you mension to "TUbes" of the subframe as the reason require for the foam pad, so somehow I assume you were ussing a stock structure

if this dzus fastener idea doesnt work out, i'll have to mount it from the bottom.. i just really dont like that idea because i have sooo much stuff attached to the subframe (ignition black box, recitifier, rear taillight, turnsignals, rear wiring harness, soon to have a shock resivior, ect...) that its hard to reach IN to get the nuts off.... thats really why i want the quarter turn fasteners.... i have domed allen head bolts, and they work great otherwise..

Oh I hear you on that one...

Find a way to ditch the foam and the Dzus will work fine

Also Take a look at this very simple but not exactlly Quick release Method of attachment "skinny" surfases togheter ussing Bicycle chain ring bolts, specially usefull if you have clearance issues like on fairings, windscreens, etc.

Clearance wise they are fantastic also really strong since they have so much diameter and they check everything aling and secure really well...

just for FYI porpuses.