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jack shaft length, for all of you who have done conversions?
Posted: Sun Aug 19, 2007 9:32 pm
by Red_Zook
Hey guys just wondering what is the shortest lenght ppl have had a jack shaft...
at curent it looks like mine will be ruffly about 2 unis just weleded together, now i KNOW already it will viabrate..
im just wondering how much??
i dont know of any one who has had one this short!
and no im not moveing my case back!!
Posted: Mon Aug 20, 2007 7:03 am
by offroader-rama
mine is very short 190mm from memory and i only get a vibration under full boost and peddel at high speeds ie 140ks + other wise fine but check out the shaft in the picks in the link
http://www.outerlimits4x4.com/phpBB2/vi ... p?t=105423
there just used either end of a tail shaft then added one more so simple may have to get it balanced but could be fixed any where
Posted: Mon Aug 20, 2007 11:25 am
by Red_Zook
yeah mine will basicly be 2 unis weled together...
it has to be so short its not funny
Posted: Mon Aug 20, 2007 11:42 am
by Gwagensteve
Just my 2c - I haven't done this myself but I have seen the results...
If you are going to run 2 uni's back to back, try and make sure that the movement between the gearbox and the case is minimised. The issue is not so much the length of the shaft as the misalignment heavily side loading the output shaft of the gearbox when the box is trying to go one way the case is going the other. 4Play built "the cradle" that locked both gearbox and transfer together when the jackshaft came down to two unis.
Don't weld two yokes together - I would recommend machining the spigot off of one and rebating it so the spigot of the other yoke is a tight fit. This should minimise vibration caused by the shaft.
However, if you have issues with jackshaft length, the only "real" way to fix it is with an OTT kicker - this eliminates all possible alignment issues.
Suzuki would have run a shorter jackshaft if they could IMHO so they could run more rear driveshaft... but they are all the same length across all models, gove or take 3/4". That tells me something about the shoftest shaft you can get away with without problems.
Steve.
Posted: Mon Aug 20, 2007 12:04 pm
by Red_Zook
yep ok got ya there..
i have ruffly about 8inches inbetween the box and transfer..
i recon i might just suck it and see kind of thing...
Posted: Mon Aug 20, 2007 5:15 pm
by 11_evl
i have seen a gearbox bolted to a transfew with only a 30mm rubber coupling inbetween them. aparently NO vibrations
Posted: Mon Aug 20, 2007 6:18 pm
by offroader-rama
are you talking about trents ute??, 11_evl
sharft
Posted: Mon Aug 20, 2007 6:29 pm
by ca18zook
yes thats what i have in my ute. im about to make another one for my brothers ute and its going to be shorter than mine. This will allow the motor to be freather back inthe engine bay and then we can use an engine fan.
Trent
Posted: Mon Aug 20, 2007 6:56 pm
by 11_evl
yes i was
Posted: Mon Aug 20, 2007 6:56 pm
by offroader-rama
when you get a chance can you send some pics i cant remember it very well is it the same as lada niva's