Diff Fitted

[femster87]

ok diff fitted. spaced with washers from gbs the biggest ones. diff is slightly shifted to one side about 0.5cm. is this a major problem should i try a bit more?

answers appreciated

[Guest gixerboy600]

Hi,

 

You need the diff as central in the tunnel as possible, otherwise your prop will constantly be ovulating (for want of a better term).

 

I ran a line exactly down the center of the tunnel and used this as datum point, once I had the diff in position I then measured each point and had spacers made to fit. This therefore ensured from this point the remainding associated parts are accurate.

 

That said 0.5mm is not the end of the world and I defy anyone to improve on that kind of tolerance, I would hoever use spacers instead of washers though because it will mean you can improve slightly!

 

Have a look at my photo's and I suggest Shaft's even more so!!

 

HTH's

 

John

[Shaft]

..... will constantly be ovulating (for want of a better term).

 

 

 

PMSL, LMFAO

 

is the prop on it's period then John???

[Guest Sharky]

A lot of little prop shafts will be on their way if it is contantly ovulating then!?

 

PMSL too!

 

 

Sharky

[Guest gixerboy600]

Truly a lesson in sex education today!!!!!!

 

I meant rotating out of center!, And I still think I have explained myslef badly

 

More beer needed methinks

[Shaft]

Truly a lesson in sex education today!!!!!!

 

I meant rotating out of center!, And I still think I have explained myslef badly

 

More beer needed methinks

 

Very funny though John, very funny!!

 

The phrase your after is.... "it will be running eccentric"

 

To be honest though, 0.5cm (5mm) is nothing at all really. A UJ on the prop will run fine upto the point of

it binding on itself, so i wouldn't worry about it Femster.

 

Nick.

[ibrooks]

The important bit is to get it parallel with the gearbox's output shaft. i.e. if you imagine a line sticking out of the middle of the output shaft and one the same on the input flnge of the diff - those lines must be as close to parallel as possible in all three dimensions.

 

If they are parallel then the angles of the UJ's will cancel each other out and acount for any misalignment. If they aren't then you will have an overall angle in the joints and as the output shaft of the box turns the drive-flange of the diff will increase and decrease in speed. A degree or two isn't noticeable but get it wrong to any extent and the vibration is un-believable.

 

Iain

[Guest old_timbo]

The other thing to remember is that you don't want the prop. straight either. You need a small amount of offset to make the needle rollers in the bearings of the UJ run around in their races. If they remain stationary the rollers damage the races (brinelling) and the assembly quickly fails. However the straighter the UJ the more efficient it is, so there is a sweet spot.

Had a good chat with the M.D. of Bailey Morris at an Autosport show which opeded my eyes. Got some good info. on their web site if you like the techy stuff. Bailey Morris

 

 

Tim

[femster87]

lmao, Just saw that one lol. ovulate eh!!! what joy. thanks fella's would know everything about cars when all this build is done.

 

thanks again

[Guest dinger]

Hi,

 

You need the diff as central in the tunnel as possible, otherwise your prop will constantly be ovulating (for want of a better term).

 

I ran a line exactly down the center of the tunnel and used this as datum point, once I had the diff in position I then measured each point and had spacers made to fit. This therefore ensured from this point the remainding associated parts are accurate.

 

That said 0.5mm is not the end of the world and I defy anyone to improve on that kind of tolerance, I would hoever use spacers instead of washers though because it will mean you can improve slightly!

 

Have a look at my photo's and I suggest Shaft's even more so!!

 

HTH's

 

John

 

 

And the winner of the "post of the month" iiiiiiiisssssssss

 

John aka gixerboy,

 

please collect your happy meal from any maccy deees

[femster87]

been to GBS over the weekend took oppotunity to measure spacing on few cars. left hand side on diff used approx 21mm spacers whilst the right was about 13mm spacer.