Manky Monkey Motors

Technical Section => Trike Tech => Topic started by: merv on July 18, 2017, 03:55:18 PM



Title: harley service car
Post by: merv on July 18, 2017, 03:55:18 PM
Has any one got any pictures of a harley service car without the body on it, i would like to see the leaf spring layout. I am thinking of other ways of fitting the axle. With the way my back is going im looking at other ways apart from hard tail


Title: Re: harley service car
Post by: terry t on July 18, 2017, 04:31:13 PM
Found this Merv. try searching Harley service car.
Its the back end of one

It looks like it is just the box that's on springs ???



Title: Re: harley service car
Post by: merv on July 18, 2017, 05:53:18 PM
Thanks Terry
Some of them are on actual leaf springs, i just cant find an open picture of one


Title: Re: harley service car
Post by: stinkey on July 18, 2017, 05:55:45 PM
Has any one got any pictures of a harley service car without the body on it, i would like to see the leaf spring layout. I am thinking of other ways of fitting the axle. With the way my back is going im looking at other ways apart from hard tail
Like I said Merv,go the adjustable shocks route..much better than clunky heavy leaf springs :)


Title: Re: harley service car
Post by: stinkey on July 18, 2017, 05:59:14 PM
It's definitely working on the leaf springs,but by Christ it's Fugly ? :-\


Title: Re: harley service car
Post by: merv on July 18, 2017, 06:00:39 PM
Cheers Stinkey
Im just looking at options


Title: Re: harley service car
Post by: merv on July 18, 2017, 06:02:28 PM
It's definitely working on the leaf springs,but by Christ it's Fugly ? :-\


Your not wrong :D


Title: Re: harley service car
Post by: stinkey on July 18, 2017, 06:04:33 PM
If you want help you know where I am


Title: Re: harley service car
Post by: terry t on July 18, 2017, 06:31:06 PM
The service car was tested with spring but didn't handle well so they used a hard tail setup.


Title: Re: harley service car
Post by: merv on July 18, 2017, 06:43:10 PM
Thanks to the both of you


Title: Re: harley service car
Post by: Olds on July 18, 2017, 08:23:47 PM
The seat on my hard tail is far more comfortable shock wise than any bike I have had (that includes Harley). Four inches plus of vertical movement. Adjustable spring preload and fully damped. Easier than mounting the axle on springs.
If you want to spring the axle have you thought about quarter-elliptics
Just an idea.


Title: Re: harley service car
Post by: merv on July 18, 2017, 09:20:25 PM
Thanks Olds
Could you explain  quarter-elliptics, thats a new one on me


Title: Re: harley service car
Post by: stinkey on July 18, 2017, 09:46:56 PM
Quarter-eleptics...you use the springs as radius rods as well as suspension basically ?


Title: Re: harley service car
Post by: Olds on July 19, 2017, 06:53:38 AM
Yup.
Basic problem with traditional leaf springs ( semi elliptic) is you need the frame to finish quite some distance behind the axle for the rear shackle mounting.
Quarter elliptic are like semi elliptic cut in half with one end firmly mounted to the frame and the other end to the axle.
Usually used with a radius rod (each side) but I have seen setups where the springs are doubled up. That is they are fitted top and bottom of the axle so no radius rods are needed.
Quarter elliptic springs can be splayed, meaning that the mounts are wide apart at the axle but narrow at the frame. Another setup is to use them as transverse springs, in conjunction with four radius rods where the springs are solidly mounted to the frame above the diff.


Title: Re: harley service car
Post by: stinkey on July 19, 2017, 08:55:11 AM
Sorry about the picture quality Merv ? Just google quarter-eleptics (images) and you will see much better..some good ideas,but can be quite heavy ? And you'd also have to fit some sort of shocks as well ? So it's going to look busy ?


Title: Re: harley service car
Post by: merv on July 19, 2017, 04:59:03 PM
thanks for the information, i think its back to the drawing board 


Title: Re: harley service car
Post by: stinkey on July 19, 2017, 06:07:47 PM
But you can't beat this for simple beauty and all from the factory once taken from it's cage ?


Title: Re: harley service car
Post by: Manky Monkey on July 19, 2017, 09:06:07 PM
That is nice Mr S.


Title: Re: harley service car
Post by: stinkey on July 19, 2017, 11:37:44 PM
If only I had the money to chrome it ? ;D


Title: Re: harley service car
Post by: BikerGran on July 20, 2017, 12:12:09 PM
Doesn't need chrome, it looks great.


Title: Re: harley service car
Post by: Manky Monkey on July 20, 2017, 12:24:34 PM
She's right :) Polish or powder-coat it.