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  #1  
Old 18th April 2004
johniemi johniemi is offline
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Default Unsynchronized gearset?

J. Eriksson, the gearbox guru from Sweden, said that he is building a special unsynchronized gearbox for og900. My question is, how do you change gears on such a box and is it easy to learn?

Couldn't find any info with search, I don't know if the unsynchronized sets are called something else... I have heard the word "dog-box" is it the same thing?

-John
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  #2  
Old 18th April 2004
Johann F Johann F is offline
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Learn how to double de-clutch i.e match the engine speed to the gearbox speed. Not very practical for an everyday driver but often standard on race cars of old. Getting the gears to transfer more power is one thing but it's the casing that holds the gears together that seems to be the weak point on C900's
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Old 18th April 2004
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ejenner ejenner is offline
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I'm guessing - but would it not be fair to say that the gearboxes aren't synchronised anyway? Only synchronised because there are numbered sets ( #6 #7 #8 ect... )

If you were to take different gears from different sets you would then have an non-synchronised gearbox.

To me it would seem that you should be able to build a gearbox using gears from different sets - and there wouldn't be any difference required for driving technique..?

There are some gaps in my technical knowledge though - so I'm open to correction.
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Old 18th April 2004
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Reverse has no synchro which causes the jolt if you put it straight in without engaging 1st or 3rd first. My synchro in 2nd is shot and I double declutch the whole time when changing down - if I don't there is the most godawful grinding noise. So if none of them had synchros I'm guessing they would all do that without double declutching.
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Old 18th April 2004
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not sure if he means without synchro's

or not synchronised
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Old 18th April 2004
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Ah. ops:

*memo to self - engage brain before posting*
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  #7  
Old 18th April 2004
Johann F Johann F is offline
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Unsyncronised means no syncromesh - Dog box means the teeth on the gears are cut differently so they are stronger ( square cut?) - again there is no syncromesh. Syncronised has nothing to do with gear ratios AFAIK.
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Old 18th April 2004
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oh - he was asking how to change gear - not how to change the gears in the gearbox..
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  #9  
Old 19th April 2004
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How much wider can he make the gears? My 900, 87 5 sp has the slowest syncros I've ever driven. My acura snicks, snicks. The point is that by the slowness of the syncros, unless mine are really worn, i'd bet they were 1/4" wide if that. He's better off using high tensil steel and using rice syncros.
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  #10  
Old 20th April 2004
GM GM is offline
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Yes, Jorgen will hopefully have the unsyncronized gears available in the next few months. The 4 speeds he builds are designed to accept the unsync gears & have a stronger case/pinion to resist flexing. He has been working on these gears for a while & hopefully soon they will be available.

Shifting from 1-2, 2-3 etc isn't where these gears act different it's the downshifting where like others state you have to match rpm's & do the double clutching. I have been driving my dad's 1963 austin healey around which has sincro's in 2+ but not a syncro in 1st, takes some time to get use to.

I forget the exact width of the new gears but around twice the width of the OEM gears
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