d8mok
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| posted on 12/2/07 at 02:00 PM |
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propshafts
the reverse gearbox is leaking oil on my fireblade engined stuart taylor locost.
Been told that i'm losing loads of power by having a reverse and it could be the reason for 2 damaged engines.
So my first question is what can i replace it with? Low cost? as money is tight at moment.
and secondly any1 interested in buyin my reverse box so i can finance the propshaft?
thanks
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BenB
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| posted on 12/2/07 at 02:05 PM |
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Anyone been able to give an explanation as to why it might have broken engines.
Sure you'll lose some ponies through increased transmission losses and reverse boxes have always had a tendency for leaks (especially the early
ones)....
but they shouldn't break engines!!!
Is it a serious amount of oil being leaked? Is it possible to live with it?
You could just take out the reverse altogether and go for the foot operated manual reverse system (ie push it).... Works for a lot of people.
Otherwise apart from fitting a newer reverse box (which seem to be a bit better re oil leaks) you're looking at an electric reverse system (in
fact STM do one) but often they need a fair bit of fettling (custom ring gears etc) so are rarely cheap.....
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d8mok
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| posted on 12/2/07 at 02:10 PM |
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i'm thinking about ditching the reverse and just pushing it whenever it needs to go backwards. What propshafts would fit?
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BenB
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| posted on 12/2/07 at 02:30 PM |
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Depends on your setup. If it's live axle then it's pretty easy. Just measure the distance between the engine and the diff and send those
measurements with the long number in the middle of the credit card off to someone like Bailey Morris. Job done 
If it's an IRS setup (therefore without a slider) things get a little more critical as you haven't got any fudge factor from the slider
mech.... From a cost point of view it might be better though because you'll probably have a support CV half-way down the current propshaft and
only one half will be split for the box so you could take apart the CV joint and replace just half the shaft....
Pushing the car is fine, you just have to plan ahead a bit. Pulled over to the side of the road (going down a rather steep hill). Rolled forwards a
little too far towards the car parked in front so I couldn't just turn the wheel and roll out from the parking space. Ended up having to push
the car uphill a few feet before I could do this. Oh well, I can cancel the gym membership and spend the money on car bits!!!
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G.Man
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| posted on 12/2/07 at 03:04 PM |
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Are you sure its leaking oil and not just spitting it from the breather?
You need to fit a catch tank to the breather hole is probably all it is, or someone has overfilled it...
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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02GF74
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| posted on 12/2/07 at 03:49 PM |
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it weold be interresting to know why it is being said the gearbox is breaking engines.
dunno much about these set up but surely the amount of power the gearbox is sapping is small compared to that required to push the car forwards?
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Catpuss
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| posted on 12/2/07 at 04:22 PM |
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Possibly with a direct drive, i.e. not chain and not bike cush drives, the transmission lash is enough to stress that motor. Possibly also the extra
mass when accellerating/decellerating is also extra strain on engine components.
Bike engines are designed for around 300kg inc rider and a much more forgiving transmission system.
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d8mok
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| posted on 12/2/07 at 05:09 PM |
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Basically whats happened guys is that i've owned the car for about 2 years. In that time she's had 3 engines. All broken gearboxes.
I've only done about 1000 miles each year and i'm not heavy with the gear changes. Whilst the cars been off the road (6months) there has
been a patch of oil under the car. Upon closer inspection it doesnt actually look like its coming from the reverse unit itself but from the selector
for the reverse? I've started to take it apart this afternoon so hopefully 2moro i'll be able to report what i think is wrong.
I spoke to Andy at AB performance and he s said i'll be losing power through the box and it could be the reason why i'm breaking gearboxes
regulary. I don't actually need a reverse so i'm definetly gonna ditch it.
The reverse unit itself looks in good condition but i'll post some pics when i finish taking it off the car.
Any ideas what its worth with the propshafts?
its a english axle i think.
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tks
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| posted on 12/2/07 at 05:57 PM |
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mhhh
i would not sell it
just change one or both props to TRT..
Tks
The above comments are always meant to be from the above persons perspective.
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ChrisGamlin
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| posted on 12/2/07 at 06:11 PM |
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quote:
Originally posted by BenB
If it's an IRS setup (therefore without a slider) things get a little more critical as you haven't got any fudge factor from the slider
mech
Most IRS props Ive seen still have a slider in them, can't see how you could reliably measure it accurately enough to do without one.
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