goodall
|
| posted on 29/12/06 at 06:20 PM |
|
|
inertia on the input shaft
will too much inertia on the input shft of the gearbox make the gearbox inoperable
|
|
|
|
|
Bob C
|
| posted on 29/12/06 at 09:14 PM |
|
|
Don't see why it should - most boxes have the inertia of clutch/flywheel/engine on the way in???
|
|
|
goodall
|
| posted on 29/12/06 at 09:41 PM |
|
|
no but you mount the engine and gearbox seperate, and had the cluth at the engine end
|
|
|
gazza285
|
| posted on 29/12/06 at 10:04 PM |
|
|
Unless something is siezed, the gearbox should operate. What makes you ask this question?
DO NOT PUT ON KNOB OR BOLLOCKS!
|
|
|
stevec
|
| posted on 29/12/06 at 10:10 PM |
|
|
quote:
Originally posted by gazza285
Unless something is siezed, the gearbox should operate. What makes you ask this question?
I wondered when someone would ask that.
My brain hurts aswell
Steve.
|
|
|
gazza285
|
| posted on 29/12/06 at 10:18 PM |
|
|
Seized would have been better on reflection......
DO NOT PUT ON KNOB OR BOLLOCKS!
|
|
|
goodall
|
| posted on 29/12/06 at 10:18 PM |
|
|
my design so that i can deside on useing a gearbox in the boot or to use a jag rear axle and find my self a ford gearbox
|
|
|
MikeRJ
|
| posted on 29/12/06 at 10:22 PM |
|
|
Having something with a high moment of inertia on the input (e.g. a very heavy friction plate) will give the synchromesh a headache, and could well
spoil the shift quality.
[Edited on 29/12/06 by MikeRJ]
|
|
|
gazza285
|
| posted on 29/12/06 at 10:46 PM |
|
|
Are you planning on using the Audi transaxle? The prop has little inertia as it is fairly light and is of a small diameter, the flywheel is usually
lighter than a direct coupled box and there is usually some form of cush drive to remove some of the peak loading.
It's a big box to stick in the back of a Locost though.
DO NOT PUT ON KNOB OR BOLLOCKS!
|
|
|
nasty-bob
|
| posted on 29/12/06 at 10:50 PM |
|
|
Alfa did it years ago, if you're saying what I think you are- engine in the front, gearbox in the back.
If thats what you want to do, take a look at that set-up. Sorry I dont know the year or model, but Google will.
|
|
|
goodall
|
| posted on 29/12/06 at 10:52 PM |
|
|
yea but i want to shift some of the mass backward to get better traction, also i have one so it means i don't have to buy a gearbox and over
haul the jag diff which has been out side since my father got it 30 years ago
|
|
|
davidwag
|
| posted on 29/12/06 at 10:54 PM |
|
|
Hi,
You mean like a Volvo 360?
David
|
|
|
gazza285
|
| posted on 29/12/06 at 11:12 PM |
|
|
I definately know Alfa boxes are out of the window, most of the box is infront of the rear axle, with the clutch infront of that, the drivers seat
would have to be either over the top or in front, highly out of proportion. The Volvo had the clutch at the front, but most of the box was again
infront of the axle.
The Audi box is probably the best bet for rear mounting, but most Locosts have a pretty good weight distribution anyway, and only have a short prop as
well. I don't think that you'll get the engine any further back as it's the flywheel and bellhousing that stop it going further
back, not the gearbox.
Another thing to consider is that the current thinking is not to distribute the weight evenly front to back, but to have the weight central, between
the axles, to reduce the polar moments and all that bullshit baffles brains, something else to think about.
As for the Jag rear axle, they are heavy, heavy, heavy. But I've got a pair of 15x11" Compomotive CX split rims to fit if you want to
build a PopRod or a chopped Model A or suchlike......
DO NOT PUT ON KNOB OR BOLLOCKS!
|
|
|
goodall
|
| posted on 29/12/06 at 11:21 PM |
|
|
well the box isn't that heavy i can walk with it in my arms, whats the mass of a english rear liveaxle?
would i be better going down the road of mid engined? but it means i have to design my own chassis, which i don't want to do
so if i don't worry about the syrcomesh, it will work alright, will gear changes be slower?
[Edited on 29/12/06 by goodall]
|
|
|
gazza285
|
| posted on 29/12/06 at 11:50 PM |
|
|
I'm not against using the Audi box at all, but the Jag rear end is a huge thing.
Concerning the weight of the Audi box. If you took the weight of all the drive train between the engine and the wheels, and compared it to a direct
linked gearbox setup, there probably isn't much difference. You still need a gearbox, diff, drive shafts, clutch, prop, bell housing and casings
wherever you put them in the car, the only bit you are moving is the gearbox. An English live axle setup is lighter than a Sierra based independent
setup, and I would imagine it's lighter than an Audi setup as the only difference between the Audi and the Sierra is at which end of the prop
the gearbox is. The Audi has a lighter gearbox/diff casing than the Sierra, but has a heavier bell housing as it needs to carry the bearings for the
front mounted clutch, where the Sierra has a lighter bell housing as all it does is hold the engine to the gearbox. Six of one and half a dozen of the
other.
I'm not going to recommend you to go mid engined, these cars are about what you want to do, there's no problem using the Audi transaxle as
long as it doesn't encroach on the passenger cabin too much. I wouldn't use the Jag axle though due to it's weight.
DO NOT PUT ON KNOB OR BOLLOCKS!
|
|
|
goodall
|
| posted on 30/12/06 at 12:02 AM |
|
|
well i'm loseing a diff caseing which must save some mass. i'v looked at the plans in the book and theres just the perfect amout of space
to fit the box in place. i could cut the bell houseing of but its alloy and woulden't be worth the time cutting of as don't lose all that
much mass by doing that. i just want to use what i have as another car in the backyard woulden't be wanted
|
|
|
gazza285
|
| posted on 30/12/06 at 12:23 AM |
|
|
You're not losing a diff casing, it's just built into the gearbox. That's my point, you get a lighter gearbox and diff combination
but at the expense of a heavier bellhousing and clutch combination.
DO NOT PUT ON KNOB OR BOLLOCKS!
|
|
|
goodall
|
| posted on 30/12/06 at 12:29 AM |
|
|
oh right and kind of see what your getting at now.
well i think i'll go ahead with the idea, could also put the cluth in the boot but that would be difficult to make
i do also have a auto box in an audi, that woulden't need a cluth at all, but thats in a car that is used on the road, but we are thinking of
putting a diesel into it so maybe the auto could be used, but it takes away from the sporty real and turns it into an american kind of thing
|
|
|
