prop shortening after cut and balance.

[ric325i]

ok i made a complete mess of my prop when i cut both sections of it, but i wanted to use the e34 centre bearing as it was in much better condition.

now i have done it i think i MAY not have shortened it enough??? so i want to play with the splines? ive heard you can do something like that but how?

who can tell me.

[Demlotcrew]

Not being funny but if you can work out how to shorten a prop by cutting it up you can work out how to adjust it on the splined section.

Andrew

[jaffro]

are you moveing ya engine back?

[ric325i]

Not being funny but if you can work out how to shorten a prop by cutting it up you can work out how to adjust it on the splined section.

Andrew

how rude

yes i know but i have not had chance to get out there yet - mainly as its rained non stop here in manc - and really its a heads up. i just wanted to find out how simple it is and how to go about it before i start pulling it apart.

are you moveing ya engine back?

yeah man its to close to my rad and some stress on the engine mount. so there is some space now the by the bulk head. i thought the prob may be pushing it forward so my plan is to try and drag it back slightly.

[Karan]

undo the bog nut around the prop near the bearing and bash/push 2 halves togethert

[ric325i]

so it is that easy

[fuzzy]

i wanted to use the e34 centre bearing

is the e34 centre bearing the same as the e30 item or stronger?
ive had problems with my custom made ,balanced prop eating standard centre bearings on hard launches so am looking for something stronger.

[Karan]

i wanted to use the e34 centre bearing

is the e34 centre bearing the same as the e30 item or stronger?
ive had problems with my custom made ,balanced prop eating standard centre bearings on hard launches so am looking for something stronger.

are u eating the rubber around the bearing or the prop coupling which is the rubber doughnut thing behind the gbox

might be worth checking alignment of ure engine/gbox assembly and gettig it as parallel as possible to the input shaft on the diff

[fuzzy]

i wanted to use the e34 centre bearing

is the e34 centre bearing the same as the e30 item or stronger?
ive had problems with my custom made ,balanced prop eating standard centre bearings on hard launches so am looking for something stronger.

are u eating the rubber around the bearing or the prop coupling which is the rubber doughnut thing behind the gbox

might be worth checking alignment of ure engine/gbox assembly and gettig it as parallel as possible to the input shaft on the diff

it tends to be the thin metal outer ring on the centre bearing bending and mis shaping and hitting the transmission tunnel on hard launches. ive had the prop rebalanced and it helped a bit but its still bending the centre bearing.
a possibilty is that the output shaft on the gearbox is bent from when i had a major write off rear end impact in my previous cossie powered project and will be examining this closely when i remove the box this weekend.
thanks.
appologies for the thread hi jack

[Karan]

is the e34 centre bearing the same as the e30 item or stronger?
ive had problems with my custom made ,balanced prop eating standard centre bearings on hard launches so am looking for something stronger.

are u eating the rubber around the bearing or the prop coupling which is the rubber doughnut thing behind the gbox

might be worth checking alignment of ure engine/gbox assembly and gettig it as parallel as possible to the input shaft on the diff

it tends to be the thin metal outer ring on the centre bearing bending and mis shaping and hitting the transmission tunnel on hard launches. ive had the prop rebalanced and it helped a bit but its still bending the centre bearing.
a possibilty is that the output shaft on the gearbox is bent from when i had a major write off rear end impact in my previous cossie powered project and will be examining this closely when i remove the box this weekend.
thanks.
appologies for the thread hi jack

when u get the prop off try and check if the gearbox output shaft is in line with the diff inoput shaft and both joining surfaces are parallel..... if not then try and ensure that the front flange of the front half of te prop is parallel with the joiinng face of the flange on the output shaft opf the gbox

this is how it should all be aligned... if all is well, it could be down to diff/subframe movement due to axle tramp and wear of you subframe and/or diff mounting bush

just some ideas....

[fuzzy]

diff recently had new mounting bush and rear axle recently had new mounting bushes. (3 months ago)

[Karan]

i have similar power to you....less torque cos mine is a gay non-turdbo but ive launched properly few times and been inspecting my prop area every month as this is one area ive been worried about since the conversion


all power/torque u have should go into twisting the prop not banging it up and down when i lowered my engine and didnt lower my gbox mouning point i had some output bearing whine from the gbox cos of this.

[Ziggy]

If it won't go short enough, I don't see why you couldn't take the rubber tighteny-nut-thingy off entirely to reduce the length by another 20mm-ish...?
If the engine is genuinely being pushed forward by the prop, then you can almost guarantee it's at the shortest it will go (without the above) - I can't see the adjuster holding it under compression.

[ric325i]

If it won't go short enough, I don't see why you couldn't take the rubber tighteny-nut-thingy off entirely to reduce the length by another 20mm-ish...?
If the engine is genuinely being pushed forward by the prop, then you can almost guarantee it's at the shortest it will go (without the above) - I can't see the adjuster holding it under compression.

i like the idea....

ok so if your right and its not being pushed forward by the prop i have another problem.

i think one engine mount isnt up to the job i may have to play with it slightly?

but i will look at moving the engine back as mush as i can.

there is something pushing the engine forward which i dont like.





as for the thread high-jack......i could not give a monkeys. i like reading the info.
but to let you know i have didnt see a difference with the e30 and e34 centre bearing but they maybe stronger in some way??? the mounting is exactly the same size.

[Yaninnya]

Centre bearing is the same ( pn 26 12 1 226 723) in nearly all E30, E34 exept 540i and E32 exept V8 and V12. In 540i and bigger E32 it is the same exept bigger inner diameter of bearing (35 mm insteda of 30 mm).
Jan

[tomson]

Centre bearing is the same ( pn 26 12 1 226 723) in nearly all E30, E34 exept 540i and E32 exept V8 and V12. In 540i and bigger E32 it is the same exept bigger inner diameter of bearing (35 mm insteda of 30 mm).
Jan

So would still fit an E30 chassis and be technically stronger than an E30 one?