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  #1  
Old 01-19-2003, 07:30 PM
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Default JEEPSTER BUILD UP PAGE

I decided to create a web site for my Jeepster build up and thought some of you might enjoy seeing what I am doing. I still need to add stuff and correct my [img]images/graemlins/AR15firing.gif[/img]grammar [img]images/graemlins/cussing.gif[/img] but over all you can understand the basics. [img]images/graemlins/smirk.gif[/img] Let me know what you think. web page
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  #2  
Old 01-19-2003, 07:40 PM
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Default Re: JEEPSTER BUILD UP PAGE

The Site looks good. I liked the write up on the sway bars. I've always wondered if CJ bars would fit and now I know. Good shock write up too.

Keep up the good work!

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  #3  
Old 01-19-2003, 08:51 PM
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Default Re: JEEPSTER BUILD UP PAGE

Nice job on the page. Lots of good information.


One correction that I'd like to point out is the shock efficiency that you stated. You said at 45 deg angle the shock is 50% efficient. In reality at a 45 deg angle a shock is 70% efficient. The only reason I know this is that I have just read a chassis building book for circle track and one for rods and that's what they both pointed out.

So, when will it be completed...
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Old 01-19-2003, 09:06 PM
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Default Re: JEEPSTER BUILD UP PAGE

Thanks for pointing that out. It will take over a year to complete. Lots of work to do.
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Old 01-20-2003, 07:58 AM
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Default Re: JEEPSTER BUILD UP PAGE

70% efficient?

At 45 degrees doesn't it move only half as much as it does
straight up according to basic geometry?
If it moves only half as far, isn't that 50%?
45 degrees breaks down into 2 equal vectors at right angles,
doesn't it?

How do they explain that?

Unless they are figuring side sway or articulation into it,
but if the axle's moving sideways enough for the shock to
be needed to control it there's bigger problems than just
shocks?
Track cars and hot rods do all kinds of things to prevent
articulation and side sway.

If the 70% is true, then wouldn't it be at or about 50% when
the shocks are completely horizontal with no movement?
That sure would make mounting easy.

He He -- Better yet - if they don't need to move, you could
leave them home in the box, just buy lots of them.
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Old 01-20-2003, 08:12 AM
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Default Re: JEEPSTER BUILD UP PAGE

Great looking site! What are the pieces of galvanized looking metal for on the defrost modification?
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Old 01-20-2003, 09:47 AM
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Default Re: JEEPSTER BUILD UP PAGE

Great looking site! What are the pieces of galvanized looking metal for on the defrost modification?

Those are the new defroster ducts hold down brackets. I still need to finish a few of the topic listed on the menu. Football got in the way [img]images/graemlins/grin.gif[/img]
The conversion makes a great improvment in hot air flow.
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Old 01-20-2003, 09:52 AM
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Default Re: JEEPSTER BUILD UP PAGE

Skinks

Could you direct me where you read up on the shock stuff? I am very curious on it. Did you come across a chart showing shock efficeny verses anlge? that would be cool to have.
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Old 01-20-2003, 12:01 PM
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Default Re: JEEPSTER BUILD UP PAGE

Oooops -- I stand corrected, my mistake, sorry.
Something was bothering me about that, so I put a pencil to it.

The 70% is more correct.
Here's how:

Let's assume for a moment the verticle axle travel is 6".
And assume a shock mounted vertically would be 15" fully
extended (droop,) then in the compressed state it would be
9".
Shock travel naturally would be the entire 6".

If the 45 degree angle was made at full droop, fully extended.
At full droop:
Vertical dimension is still 15" (call that A)
Offset inward 15" (call that B)
The shock length is the hypotenuse of the right triangle formed (call that C)
(A sqd + B sqd) = C sqd = 21.2"

In the fully compressed position:
A is now less, measuring 9" (15-6)
B remains the same 15" (the shock's now even more on it's side)
(A sqd + B sqd) = C sqd = 17.5"

In other words:
21.2 fully extended
17.5 fully compressed
shock travel = 3.7" (61% of the original 6" vertical movement)


Now a variation of that -- if the shock's 45 degree angle was
made at the full compression measurement:
17.5 fully extended,
12.7 fully compressed,
shock travel = 4.8" (80% of the original 6" vertical movement).

Figuring at normal rest the suspension is somewhere "in between"
fully compressed and full droop, so the 70% approximation is
correct.

I hope this makes sense.
It's just simple right triangle geometry calculations.

Just plug in your numbers.

I've been trying to calculate the spring rates, angles, and
positions on my project with the Tomcat rear and the hybrid
front, calculations weren't coming out right. I was looking
at it wrong.

So thanks for getting me to think on another track.

By the way Jim, it looks great so far.

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  #10  
Old 01-20-2003, 02:34 PM
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Default Re: JEEPSTER BUILD UP PAGE

Thanks Rich....geezzzz now I know why I flunked math but thanks for the cool looking post...grin. Think I will purchase a angle finder thingy and see just what angle my shocks are set at. I will let you do the math!!!!! [img]images/graemlins/grin.gif[/img]
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