Irony
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| posted on 12/3/10 at 01:42 PM |
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Propshaft Basics
I am thinking about Propshafts in my lunch hour and I have been searching previous posts and finding answers to my questions.
I have my diff 'in' although its not fully tightened in. A LT77 gearbox will fit in my Luego Viento coupled to a V8 when I get it
sorted.
My questions are below:
What sort of propshaft would you guys recommend i.e what donor? I have the Lt77 up front and a Granada 7.5 inch diff bringing up the rear.
What sort of work will need to be done to it? Lengthening/Shortening to size, refurbishment?
The length surely is critical how accurate does this have to be? Do you get a propshaft shortened to the approx length then mount the engine
accordingly?
Cheers
[Edited on 12/3/10 by Irony]
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MikeR
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| posted on 12/3/10 at 01:50 PM |
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most people get the propshaft made brand new - a few make their own. The reasoning for new tends to revolve around failure being VERY painful - unless
you don't need a left side.
The propshaft doesn't have to be exactly the right length as you don't push it in all the way, its normally about an inch short of being
pushed in all the way - this means if you're 5 or 10mm out it doesn't really matter.
If you go to some one like dunning and fairbank i think their web site has a download you can use to measure up how big your prop should be.
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AdamR
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| posted on 12/3/10 at 01:53 PM |
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The easiest and safest route is to get a custom made prop built to your spec. These cost around £150, and are available from various specialist
manufacturers (I got mine from http://www.105speed.com/default.asp?id=62).
Length is important, but the gearbox connection is usually a splined shaft the slides into the gearbox. This gives you a few inches of flexibility.
HTH
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Irony
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| posted on 12/3/10 at 02:07 PM |
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Okay so it sounds like new it is. So will the £150 (ish) include the universal joints that I need?
After looking at websites and posts on here it seems quite important to get the angles right to avoid vibration. How accurate does that need to be in
a Kitcar? I suppose buying a inclinometer might be a good idea?
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t16turbotone
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| posted on 12/3/10 at 02:35 PM |
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i run a lt77 and sierra diff, Dave Mac Propshafts made me a new item and the cost was £85.00 + vat.....as a rough guide
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fesycresy
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| posted on 12/3/10 at 02:35 PM |
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There is a sliding joint to take out any discrepancies and engine gearbox movement.
This should give you say +/- 5mm at least ?
Contact Dunning and Fairbank the'll let you know what you need, I think there's dimension info on their website.
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The sooner you fall behind, the more time you'll have to catch up.
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blakep82
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| posted on 12/3/10 at 03:33 PM |
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quote:
Originally posted by Irony
Okay so it sounds like new it is. So will the £150 (ish) include the universal joints that I need?
i paid (i think) £130 for mine + post, so about £150. sent them the distance from the diff flange to the gearbox seal, and they made it all for me
with new parts. definitely the right way to do it
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StrikerChris
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| posted on 12/3/10 at 03:35 PM |
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The important thing with aligning diff/box is the angle of the flange faces.Imagine the prop between the shafts in the pic. The top pic is fine, the
other 2 situations will shake you to bits!
ie box can be higher lower left or right of diff,(its actually better and stops the uj's locking up)
[Edited on 12/3/10 by StrikerChris]
 
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