MikeR
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| posted on 25/3/06 at 06:54 PM |
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Do type 9's have to be level?
Just about to re-do my gearbox mount for the 10th time and i realised something. My gearbox is pointing upwards at a slight angle (engine end higher
than prop shaft).
Now i apprecate when the car is moving up and down hills the gearbox will change angle but ...... is it good practice to have it level?
(the correct answer is no here as i'll have about 4.5" of ground clearance and my exhaust will fit nicely)
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oliwb
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| posted on 25/3/06 at 08:42 PM |
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Nope, its more important that the drivetrain components are all parallel with each other, for example the engine/gearbox, propshaft and Differential
should all be parallel thought whether this is horizontal/level or not is not critical....Obviously the closer to level the better cos it will give an
even distribution of oil but if it don't fit it don't matter too much.....Cheers Oli.
If your not living life on the edge you're taking up too much room!
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MikeR
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| posted on 25/3/06 at 09:00 PM |
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errm, i'd disagree with that a little, the gearbox should not be inline with the diff, this will mean the UJ's aren't taking any
forces in the same place all the time as the joint will move slowly as it turns.
(i know thats a terrible description, i've had a drink and it makes sense to me! :p)
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rusty nuts
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| posted on 25/3/06 at 09:16 PM |
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Ideally the prop shaft mounting flanges on the diff and gearbox (no flange on type nine ) should be paralell although it's not neccessary they
are at the same level /in line . Suspect with the type nine the diff flange should be at 90 degrees to the output shaft on the gearbox Explained in
issue 7 of PPC
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stevebubs
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| posted on 26/3/06 at 01:18 AM |
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quote:
Originally posted by MikeR
errm, i'd disagree with that a little, the gearbox should not be inline with the diff, this will mean the UJ's aren't taking any
forces in the same place all the time as the joint will move slowly as it turns.
(i know thats a terrible description, i've had a drink and it makes sense to me! :p)
I think what you're trying to say is...
parallel but not inline...
Yes??
Stephen
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MikeR
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| posted on 26/3/06 at 09:08 AM |
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i thats the case, the only way to get them parallel is to have the engine and gearbox level as the diff axle brackets are set at 90 degrees to the
input face.
to quote myself when i hit another brick wall...........
Bugger! Bugger! Bugger! Bugger! Bugger! Bugger! Bugger! Bugger! Bugger! Bugger!
and
Bugger!
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rusty nuts
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| posted on 26/3/06 at 09:43 AM |
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Would it be any easier to lower the engine mounts? that would have the effect of lifting the rear of the gearbox.
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MikeR
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| posted on 26/3/06 at 10:32 AM |
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yeah - just trying to get max ground clearance for touring .......
got the engine almost level with the bottom chassis rail at the moment!
Going to end up lowering everything!
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rusty nuts
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| posted on 26/3/06 at 12:58 PM |
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Can the sump be shortened ? the lowest point on the bell housing may be the best point of reference?
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britishtrident
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| posted on 26/3/06 at 01:02 PM |
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It is "normal" to have the rear of the chassis sitting slightly higher than the front -- has small advantages to do with aerodynamic drag
and stability.
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MikeRJ
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| posted on 26/3/06 at 09:03 PM |
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The reason why the gearbox flange and diff flange should be parallel, is to ensure that the variations in propshaft speed introduced by the first UJ
are canceled out perfectly by the second. If this doesn't happen then you get vibration.
However, IIRC then the cancelation still happens even if the angle of the second UJ is equal but opposite, i.e. as long as the total angle is shared
evenly between the two joints (and the angle is in the same plane) then it should be fine.
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