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Author Topic: Beta gearbox differences  (Read 2476 times)
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mangocrazy
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« on: November 10, 2016, 11:15:47 PM »

And I should also add - suitability to mildly tuned (approx 160bhp) Beta 2000 engine. I'm slowly getting to the point where i can think about gearbox options for my planned Beta 2000 engine upgrade. It will have twin DCOE 45s, approx 10:1 pistons, Kent fast road cams and Eric's ex-Evo cylinder head. I'm hoping for about 155-160 bhp and a nice broad torque curve. Which of the various gearbox options would suit it best and why?

I have the original Spider gearbox sitting on blocks in my cellar that could be re-used and there is also the (as yet unknown quantity) of a 2000 i.e. gearbox that (along with the engine) has recently been fitted into the Spider in an attempt to get it back on the road again. There is also the possibility of acquiring a VX gearbox, althought they are pretty rare, I believe.

Of the three, which would be best suited to my intended state of engine tune? The car will be purely road only and journeys of reasonable length on French aiutoroutes will be likely, as well as more spirited driving around some of the excellent D roads we have in the region...
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
WestonE
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« Reply #1 on: November 14, 2016, 04:18:44 PM »

Graham

Use the 2000 IE box if it proves to be OK when you use it. The later boxes had better tolerances stronger shift forks and needle rollers on the gear clusters. A VX box would be too tall on the ratios for your engines torque level.

I recommend you change the gearbox oil hot for Redline 75w90 NS oil. This will protect the brass synchro rings and give excellent cold shifting.

Eric   
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mangocrazy
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« Reply #2 on: November 14, 2016, 08:42:57 PM »

Thanks Eric. That sounds reasonable. Were the final drive ratios the same for carb and i.e. gearboxes? I wouldn't mind a slightly more relaxed top gear cruising speed on longer journeys.
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
peteracs
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« Reply #3 on: November 15, 2016, 07:13:54 AM »

Hi Graham

You may find this of interest.

http://www.lancisti.net/forum/showthread.php?2133-Beta-gear-ratios&highlight=Beta+differential+ratios

Peter
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lukasdeopalenica
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« Reply #4 on: November 15, 2016, 09:46:44 AM »

If I only had an VX box I would install it. That would be the best cruising option. At least for me. My present gears are much to short. I suspect my box is wrongly from a carb version ( I have 90km/h @ 3000rpm @ 5gear).
As far as I know there were differences in the final ratios even with the same engines but dedicated for different markets. Definitely German vs. UK market.
In the attached table there are numbers I have spotted in various manuals.


* Capture.JPG (15.09 KB, 123x123 - viewed 326 times.)
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Lancia Beta HPE 2000i.e. '82 rosso corsa
SAAB 900i 16V Aero, '93 solid black
Subaru Outback 3.0R
Honda CB125 K6 '76 electric blue
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mangocrazy
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« Reply #5 on: November 20, 2016, 12:50:19 PM »

Hi Peter,

Thanks for that link. It certainly seems a bit of a minefield with ratios changing during production runs. Assuming I can get my i.e. engine/gearbox to work in the Spider it will be instructive to see how the i.e. gearbox differs from the carb 2000 one.

Graham

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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
WestonE
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« Reply #6 on: November 20, 2016, 01:58:51 PM »

Graham

Look on the side of the main casing and see if it says 18 65 then you know you are really lucky and have the more relaxed cruising IE box. The other IE ratio is the same as Beta 2000 really. BTW 18 teeth on the pinion 65 teeth on the crown wheel in the diff.

Eric
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mangocrazy
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« Reply #7 on: November 20, 2016, 08:16:31 PM »

Thanks Eric. The engine and gearbox are in the car now, pretty much all plumbed in apart from coolant and battery. Will the numbers be visible with gearbox in situ? By 'side of the main casing' do you mean the end casing of the gearbox at the narrowest point?
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
lukasdeopalenica
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« Reply #8 on: November 21, 2016, 08:25:03 AM »

I have three gearboxes and none of them has such marks Sad
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Lancia Beta HPE 2000i.e. '82 rosso corsa
SAAB 900i 16V Aero, '93 solid black
Subaru Outback 3.0R
Honda CB125 K6 '76 electric blue
Specialized Epic & Stumpjumper
WestonE
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« Reply #9 on: November 21, 2016, 03:45:58 PM »

Graham

Normally stamped into the long section of casing near the drive shaft output. some late boxes also had the ratio in white stencilled text near the bell housing. I have re-built 5 of these boxes and probably stripped 15 over the years and not yet seen a box without the markings. However it is possible to have different internals from a re-build obviously.

Eric
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mangocrazy
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« Reply #10 on: November 21, 2016, 09:41:06 PM »

THanks Eric. I'll give it some close inspection when I'm next in France (which almost certainly won't be before spring 2017...)
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1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
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